fix: correct zero-safe pathconf checks and connectivity prefix match

- Use `is not None` for pathconf values so 0 is not silently dropped
- Broaden connectivity prefix check to catch bare "connectivity" key

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -10,24 +10,49 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
         
       - name: Set up Python
-        uses: actions/setup-python@v5
+        run: |
-        with:
+          python3 --version
-          python-version: '3.11'
+          python3 -m ensurepip --upgrade
           
       - name: Install build tools
         run: |
-          python -m pip install --upgrade pip
+          python3 -m venv .venv
-          pip install build twine
+          .venv/bin/pip install --upgrade pip
+          .venv/bin/pip install build twine
           
       - name: Build package
-        run: python -m build
+        run: .venv/bin/python -m build
         
       - name: Extract version from tag
         id: get_version
         run: echo "VERSION=${GITHUB_REF#refs/tags/v}" >> $GITHUB_OUTPUT
-        
+      - name: Generate changelog
+        id: changelog
+        run: |
+          PREV_TAG=$(git tag --sort=-version:refname | grep -m 1 -v "^${GITHUB_REF#refs/tags/}$")
+          if [ -n "$PREV_TAG" ]; then
+            CHANGELOG=$(git log --pretty=format:"- %s" "${PREV_TAG}..HEAD")
+          else
+            CHANGELOG="Initial release"
+          fi
+          # Write multiline to output
+          {
+            echo "CHANGELOG<<EOF"
+            echo "$CHANGELOG"
+            echo "EOF"
+          } >> $GITHUB_OUTPUT
+
+      - name: Upload to Gitea PyPI registry
+        env:
+          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+          TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
+        run: |
+          .venv/bin/python3 -m twine upload --repository-url https://git.wrede.ca/api/packages/andreas/pypi dist/*
+
       - name: Create release
         uses: actions/gitea-release-action@v1
         with:
@@ -35,4 +60,4 @@ jobs:
             dist/*.whl
             dist/*.tar.gz
           title: "Release ${{ steps.get_version.outputs.VERSION }}"
-          body: "Release version ${{ steps.get_version.outputs.VERSION }}"
+          body: "${{ steps.changelog.outputs.CHANGELOG }}"

.gitignore

@@ -5,9 +5,14 @@ __pycache__/
 *.pyo
 .flake8
 .venv/
+.continue/
 test/
 build/
 dist/
 *.egg-info/
 ssl/
 uv.lock
+.hb.yaml
+.superpowers/
+rndc-key
+docs/superpowers/

.hb.yaml

@@ -1,254 +0,0 @@
-#name: "w02"
-hb_port: 50003   
-hbd_host: ''
-#logfile: "/home/andreas/public_html/messages/andreas"
-logfile: "/home/andreas/logs/heartbeat/heartbeat.log"
-#logfile: "/Users/andreas/public_html/messages/andreas"
-logfmt: "msg"
-grace: 40
-interval: 10
-
-# Notification Channels - Define notification providers centrally
-# Each channel has a type (pushover, email, signal, mattermost) and type-specific configuration
-notification_channels:
-
-  pushover_standard:
-    type: pushover
-    token: ac7NLX2rPjXFareeDgLpXNoDf4iFmf
-    user: uDhH33UjQQDYtNzJb1ThRiWb9ingGK
-
-  signal_andreas:
-    type: signal
-    cli_path: /usr/local/bin/signal-cli
-    user: +14168226179
-    recipient: +14168226179
-  
-  email_andreas:
-    type: email
-    recipients: [aew.hbd.notify@wrede.ca]
-    sender: aew.hbd@wrede.ca
-    smtp_server: smtp.fastmail.com
-    smtp_port: 587
-    smtp_user: andreas@wrede.ca
-    smtp_password: pvtvefyp5gbhnch2
-  
-  # Example additional channels (commented out)
-  # pushover_urgent:
-  #   type: pushover
-  #   token: your-app-token
-  #   user: your-user-key
-  #
-  mattermost_devops:
-    type: mattermost
-    host: mattermost.example.com
-    token: webhook-token
-    channel: devops-alerts
-    username: heartbeat-bot
-    icon: https://example.com/heartbeat-icon.png
-
-# Default notification channels (used if host doesn't specify channels)
-default_notification_channels: [pushover_standard]
-
-# Host definitions - combines threshold mapping, watch status, DNS updates, and notifications
-hosts:
-  wentworth:
-    threshold_config: default
-    watch: true
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  y:
-    threshold_config: default
-    watch: true
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  winter:
-    threshold_config: default
-    watch: true
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  wally:
-    threshold_config: freebsd_server
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  eris:
-    threshold_config: truenas_server
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: false
-  
-  haschloss:
-    threshold_config: default
-    watch: false
-    dyndns: true
-  
-  wayback:
-    threshold_config: default
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: true
-  
-  wertvoll:
-    threshold_config: default
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: true
-  
-  weekend:
-    threshold_config: freebsd_server
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: true
-  
-  cotgate:
-    threshold_config: default
-    watch: false
-    dyndns: true
-  
-  rvgate:
-    threshold_config: default
-    watch: false
-    dyndns: true
-  
-  draper:
-    threshold_config: default
-    watch: false
-    notification_channels: [pushover_standard]
-    dyndns: true
-
-# Hosts to drop/ignore
-drophosts: {"unknown", "wookie15", "wort"}
-
-nsupdate_bin: "/usr/local/bin/nsupdate"
-
-dyndomains: {"wrede.org"}
-
-ws_port: 50005
-# wss_port: 50006  # Commented out - use plain WebSocket instead of secure WSS
-# cert_path: "/usr/local/etc/letsencrypt/live/hbd.wrede.ca/"
-# cert_path: "test/"
-# CERT_PATH = "./test/"
-# wss_pem: "fullchain.pem"
-# wss_key: "privkey.pem"
-
-journal_enabled: true                    # Enable/disable journaling
-journal_dir: /home/andreas/logs/heartbeat         # Journal directory
-journal_file: messages.journal           # Base filename
-journal_max_size: 104857600             # Max size (100MB default)
-journal_max_backups: 10                 # Number of backups to keep
-
-threshold_configs:
-  default:
-    thresholds:
-      cpu_monitor:
-        cpu_percent:
-          warning: 80.0
-          critical: 90.0
-      memory_monitor:
-        percent:
-          warning: 85.0
-          critical: 95.0
-      disk_monitor:
-        partitions:
-          /:
-            percent:
-              warning: 85.0
-              critical: 90.0
-      rtt:
-        warning: 50
-        critical: 250.0
-
-
-  freebsd_server:
-    thresholds:
-      cpu_monitor:
-        cpu_percent:
-          warning: 80.0
-          critical: 90.0
-      memory_monitor:
-        memory_percent:
-          warning: 97.0
-          critical: 100.0
-      disk_monitor:
-        partitions:
-          /:
-            percent:
-              warning: 85.0
-              critical: 90.0
-      nagios_runner:
-   #     overall_status_code:
-   #       warning: 1
-   #       critical: 2
-   #       operator: ">="
-        load_status:
-          warning: WARNING
-          critical: CRITICAL
-          operator: "=="
-        ups_load:
-          display: "load to high: {ups_output}"
-          warning: 70
-          critical: 80
-          operator: ">="
-        ups_status_code:
-          display: "{ups_output}"
-          warning: 1
-          critical: 2
-          operator: ">="
-        nextcloud_apps_status_code:
-          display: "{nextcloud_apps_output}"
-          warning: 1
-          critical: 2
-          operator: ">="
-      rtt:
-        warning: 50
-        critical: 250.0
-
-  truenas_server:
-    thresholds:
-      cpu_monitor:
-        cpu_percent:
-          warning: 80.0
-          critical: 90.0
-      memory_monitor:
-        percent:
-          warning: 3.0
-          critical: 95.0
-      disk_monitor:
-        partitions:
-          /:
-            percent:
-              warning: 85.0
-              critical: 90.0
-      nagios_runner:
-   #     overall_status_code:
-   #       warning: 1
-   #       critical: 2
-   #       operator: ">="
-        load_status:
-          warning: WARNING
-          critical: CRITICAL
-          operator: "=="
-        ups_load:
-          display: "load to high: {ups_output}"
-          WARNING: 70
-          CRITICAL: 80
-          OPERATOR: ">="
-        ups_status_code:
-          DISPLAY: "{ups_output}"
-          warning: 1
-          critical: 2
-          operator: ">="
-        nextcloud_apps_status_code:
-          display: "{nextcloud_apps_output}"
-          warning: 1
-          critical: 2
-          operator: ">="
-      rtt:
-        warning: 120
-        critical: 250.0
-
-

.vscode/launch.json

@@ -4,12 +4,13 @@
   // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
   "version": "0.2.0",
   "configurations": [
+
     {
       "name": "Python: Run hbd (module)",
       "type": "debugpy",
       "request": "launch",
       "module": "hbd.server.cli",
-      "args": ["-c", "/home/andreas/git/heartbeat/.hb.yaml", "-f", "-v", "-x", "-x", "-x", "-x"],
+      "args": ["-c", "~/.hb.yaml", "-f", "-v"],
       "cwd": "${workspaceFolder}",
       "env": {
         "PYTHONPATH": "${workspaceFolder}"
@@ -28,14 +29,14 @@
       ]
     },
     {
-      "name": "Python: Run hbd with debugpy (listen)",
+      "name": "Python: Run hbc (module)",
       "type": "debugpy",
       "request": "launch",
-      "module": "debugpy",
+      "module": "hbd.client.main",
-      "args": ["--listen", "5678", "--wait-for-client", "-m", "hbd.server.cli", "-c", ".hb.yaml", "-f", "-v"],
+      "args": ["-c", "~/.hbc.yaml",  "-v", "winter"],
+      "cwd": "${workspaceFolder}",
       "env": { "PYTHONPATH": "${workspaceFolder}" },
       "console": "integratedTerminal",
-      "justMyCode": false
     }
   ]
 }

CHANGELOG.md

@@ -0,0 +1,457 @@
+# Changelog
+
+All notable changes to this project are documented here, organized by release.
+
+## [5.3.10]
+
+### Added
+- clear stale plugin data and persist OAuth users to config
+- auto-scale CPU history graph Y axis
+- add CPU usage history graph to CPU Monitor section
+
+### Fixed
+- remove bak file in bumpminor.sh
+
+---
+
+## [5.3.9]
+
+### Added
+- auto-update CHANGELOG and README in bumpminor.sh
+
+---
+
+## [5.3.8]
+
+### Added
+- Wiki home page with overview and getting started guide
+
+### Fixed
+- Release workflow: use `GITHUB_REF`/`GITHUB_OUTPUT` (Gitea Actions uses GitHub-compatible variable names)
+- Release workflow: replace `head -1` with `grep -m 1` to avoid SIGPIPE (exit 141) in changelog step
+
+---
+
+## [5.3.7]
+
+### Added
+- Dark mode with light/dark/auto theme setting
+- UNKNOWN level filter in Log of Events
+- Per-metric grace period input in threshold settings
+- Replace Dynamic DNS YAML editor with a web form
+- Sort hosts, thresholds, and channels alphabetically on settings page
+- Suppress alerts for unwatched hosts
+
+### Fixed
+- Preserve log message order when replaying history on connect
+
+---
+
+## [5.3.6]
+
+### Added
+- MIT license
+
+### Fixed
+- Correct ZFS pool status threshold operator and add per-metric grace
+- Normalize email and domain fields
+- Move dependencies back under `[project]` in pyproject.toml
+
+---
+
+## [5.3.4]
+
+### Fixed
+- Run full reload after HTTP config publish, not just `config.reload()`
+
+---
+
+## [5.3.3]
+
+### Added
+- Replace YAML threshold editor with a form-based UI
+- Replace multi-select fields with dual-panel picker on settings page
+- Nav bar button to publish pending config changes
+- Host, level, and message filters in Log of Events
+
+### Fixed
+- Remove container max-width; stop stretching inputs on settings page
+
+### Removed
+- Legacy `dyndnshosts`/`drophosts` config keys
+
+---
+
+## [5.3.2]
+
+### Added
+- Retry DNS resolution indefinitely; add `-4`/`-6` address-family flags to `hbc` and `hbc_mini`
+- Replace YAML hosts editor with form-based CRUD table
+- Replace YAML notification channel editor with form-based UI
+
+### Fixed
+- Support list-valued `threshold_config` in hosts table
+- Derive hosts threshold config list from config file keys
+- Replace channel checkboxes in Users table with multi-select
+- Support plugin-level `enabled: false` in threshold config
+- Always populate glance strip for all hosts on page load
+- Fetch host info on initial page load
+
+---
+
+## [5.3.1]
+
+### Added
+- Host info section in Host Overview (fetched and rendered on card expand)
+- `GET /api/0/hosts/{hostname}/info` endpoint
+- Show suffix-matched metric coverage in host info threshold table
+- Move `hbc_version` and `hbc_type` out of `os_info` into the host info section
+
+### Fixed
+- Correct `THRESHOLD_DEFAULTS` metric keys and add missing defaults
+
+---
+
+## [5.3.0]
+
+### Added
+- Profile page self-service: change identity, password, and notification channels
+- Settings page editor with form sections, YAML editors, stage/publish/rollback workflow
+- Config read API: `GET /api/0/config`, `/section/{name}`, `/backups`
+- Config write API: `POST /api/0/config`, `POST /api/0/config/rollback`
+- `configio` module for comment-preserving YAML round-trip writes
+- Multi-provider OAuth2 login page and generic provider routes
+- Log login/logout events to the event log with auth source
+
+### Fixed
+- ZFS monitor alerts dropped on restart with wildcard pool thresholds
+- Preserve OAuth users across config reload
+- Config API error handling, consistent 403 messages, deduplicated key lists
+- Validate password body type; coerce `notification_channels` to strings in profile API
+- Preserve OAuth `client_secret` on roundtrip; harden rollback path validation
+
+---
+
+## [5.2.6]
+
+### Added
+- Alerts host-filter field with URL query parameter and notify URL
+- Optional logo on Gitea OAuth login button
+
+### Fixed
+- Show human-readable duration in re-notification messages
+
+---
+
+## [5.2.5]
+
+### Added
+- Alert CRITICAL on degraded or suspended ZFS pools (ONLINE=OK, DEGRADED=WARNING, all else=CRITICAL)
+- Sign in with Gitea button on login page with OAuth2 redirect/callback routes
+- OAuth2 CSRF state management
+- Host owner shown in glance strip for admin users
+- C port of `hbc_mini` (single-file client in `scripts/c/`)
+
+### Fixed
+- Use `base_url` config for OAuth redirect URI to handle reverse proxy deployments
+- Preserve OAuth users across config reload
+- Escape HTML in login page error display
+
+---
+
+## [5.2.4]
+
+### Added
+- `hbc`/`hbc_mini`: `owner` config field included in `os_info`; server applies to host record
+- Server requests InfoPlugin refresh when a host has no plugin data
+- Event log stores structured dicts; filter by user
+
+### Fixed
+- Strip `_status_code` suffix from displayed metric names in threshold alerts
+- Use plain URL in Mattermost plugin metrics link
+- Fall back to `default_owner` when `os_info` has no owner
+
+---
+
+## [5.2.3]
+
+### Added
+- `hbc`/`hbc_mini`: log name and version at startup
+- Show metric name inline with hostname in alerts and notifications
+
+### Fixed
+- Send shutdown message only if a boot message was previously sent; suppress both on restart
+
+---
+
+## [5.2.2]
+
+### Fixed
+- Retry connection on network error instead of permanently dropping it
+- Silence `aiohttp.access` log; strip plugin prefix in alerts UI
+
+---
+
+## [5.2.1]
+
+### Fixed
+- Threshold and logging improvements
+
+---
+
+## [5.2.0]
+
+### Added
+- `nagios` operator for direct exit-code severity mapping
+
+### Fixed
+- Always show `THRESHOLD_DEFAULTS` in Settings threshold config
+
+---
+
+## [5.1.21]
+
+### Added
+- `nagios_runner` improvements and alerts page fixes
+
+---
+
+## [5.1.20]
+
+### Added
+- Generic threshold matching for `nagios_runner` with `{check_name}` display support
+
+### Fixed
+- Reduce default hysteresis from 10% to 2%
+- Show recovery threshold in alerts UI
+
+---
+
+## [5.1.19]
+
+### Added
+- Exclude ZFS ARC from `memory_percent`
+- Add `uptime_seconds` to `cpu_monitor`
+
+### Fixed
+- Send boot/shutdown message on the first open connection, not blindly on the first in list
+
+---
+
+## [5.1.18]
+
+### Added
+- Fetch-based Update/Delete buttons with toast notifications on Host Overview
+
+### Fixed
+- Settings thresholds show correct per-config metrics; miscellaneous `hbc` fixes
+
+---
+
+## [5.1.17]
+
+### Added
+- Owner Update/Delete buttons on Host Overview; purge stale alerts on reload
+- Retry `AsyncConnection.open()` indefinitely; drop IPv6 only on early startup failure
+- Alert pie chart in the nav bar
+
+### Fixed
+- Make Alerts page scrollable
+
+---
+
+## [5.1.16]
+
+### Added
+- Generic `ping_monitor` thresholds; round RTT to nearest ms
+
+---
+
+## [5.1.15]
+
+### Added
+- Link hostnames in Live Dashboard to Host Overview
+- Threshold Configurations section on settings page
+
+### Fixed
+- Suppress notifications on alert de-escalation (e.g. CRITICAL→WARNING)
+- Suppress recover messages for down durations under 4 seconds
+
+---
+
+## [5.1.14]
+
+### Added
+- ZFS pool renderer in Host Overview
+
+---
+
+## [5.1.13]
+
+### Added
+- ZFS monitor plugin
+- Host-level watch flag to suppress notifications
+- Filter Live Dashboard and Host Overview by owner/manager
+- Composable `threshold_config` list for per-host threshold layering
+- Restart on SIGHUP in `hbc` and `hbc_mini`
+
+### Fixed
+- Mask `api_password` and `access_token` in settings page
+
+---
+
+## [5.1.12]
+
+Internal release — no user-visible changes.
+
+---
+
+## [5.1.11]
+
+### Fixed
+- Install under Docker
+- Clean up install script
+
+---
+
+## [5.1.10]
+
+### Fixed
+- Synchronize version in `hbc_mini`
+- Install script no longer overwrites itself
+
+---
+
+## [5.1.9]
+
+### Added
+- Install `hbc_mini` via package or install script
+
+---
+
+## [5.1.8]
+
+### Added
+- Track `hbc` type and version
+
+### Fixed
+- Nav bar position
+
+---
+
+## [5.1.7]
+
+### Added
+- `hbc_mini`: single-file heartbeat client
+
+### Fixed
+- Drop dead connections on protocol error
+
+---
+
+## [5.1.6]
+
+### Fixed
+- Simplify event log usage; fix argument handling
+
+---
+
+## [5.1.5]
+
+### Added
+- Update `hbc` via `hb_install.sh` instead of code patching
+
+---
+
+## [5.1.4]
+
+### Added
+- Redesign Plugin Metrics page as Host Overview
+
+---
+
+## [5.1.3]
+
+### Added
+- Validate absolute command paths at `nagios_runner` init
+- Async subprocess in `nagios_runner` with stderr capture and signal handling
+- `skip_reason` field on `Plugin`; surface in `PluginLoader` init messaging
+
+### Fixed
+- Use `shlex.split()` for `nagios_runner` path validation to handle quoted paths
+- Reconfigure logging to syslog after `daemonize()`
+
+---
+
+## [5.1.2]
+
+### Fixed
+- Plugin config lookup shadowed by `CLIENT_DEFAULTS` plugins key
+- Apply grace period to all threshold alerts before logging/notifying
+- RECOVER routing: use consistent level name and route via alerted channel
+- Early reminder notifications and lost recovery notifications
+- Non-alerting of overdue hosts
+
+### Added
+- Swiss clock widget in the UI
+
+---
+
+## [5.1.1]
+
+### Added
+- SMS and Matrix notification channels
+- CLI commands `stop`, `restart`, and `reload` for `hbd`
+- WebSocket endpoint at `http://.../ws`
+- Mobile HTML pages
+
+### Fixed
+- Profile not updating
+- Sortable columns in tables
+
+---
+
+## [5.1.0]
+
+### Added
+- Ping monitor plugin
+- Persist state to pickle file; restart timers on server restart
+- SIGHUP config reload for `hbd`
+- Renotify on CRITICAL only; persistent user sessions
+- RTT count threshold
+
+### Fixed
+- Bogus notification on new clients
+- Show "overdue" in alerts instead of null
+
+---
+
+## [5.0.12]
+
+### Added
+- User management and settings page
+
+---
+
+## [5.0.10]
+
+### Added
+- Publish package to Gitea PyPI registry
+
+---
+
+## [5.0.9]
+
+### Added
+- Use `SO_TIMESTAMP` for RTT measurement (Linux, FreeBSD, macOS)
+- Persist state to pickle file; restart timers on restart
+
+---
+
+## [5.0.6]
+
+### Added
+- Major codebase refactoring: restructured into client/server components
+- Per-client threshold configuration
+- Display and acknowledge alerts in the UI
+- Proper `hbc` termination; `hbd` config reloadable at runtime

CLAUDE.md

@@ -0,0 +1,4 @@
+1. Don't assume. Don't hide confusion. Surface tradeoffs.
+2. Minimum code that solves the problem. Nothing speculative.
+3. Touch only what you must. Clean up only your own mess.
+4. Define success criteria. Loop until verified.

Home.md

@@ -0,0 +1,210 @@
+# Heartbeat
+
+Heartbeat is a lightweight host monitoring system built around a simple idea: each machine you want to monitor runs a small client (`hbc`) that sends a UDP "heartbeat" packet to a central server (`hbd`) on a regular interval. If a heartbeat stops arriving, you get notified. Alongside reachability, clients can ship system metrics — CPU, memory, disk, network — and the server will alert you when any of those cross a threshold.
+
+## How it works
+
+```
+  [ monitored host ]              [ your server ]
+  ┌─────────────┐  UDP 50003     ┌────────────────────────┐
+  │     hbc     │ ────────────>  │  hbd                   │
+  │             │                │  host state tracking   │
+  │  plugins:   │  <──────────── │  threshold alerting    │
+  │  cpu, mem,  │  ACK / CMD     │  notifications         │
+  │  disk, ...  │                │  web dashboard + API   │
+  └─────────────┘                └────────────────────────┘
+```
+
+- **hbd** — the server daemon. Tracks which hosts are alive, evaluates metric thresholds, fires notifications, serves the web dashboard and REST API.
+- **hbc** — the client. Sends heartbeats and plugin data over UDP. Runs on any Linux/BSD/macOS host.
+- **hbc_mini** — a zero-dependency single-file alternative (`hbc_mini.py` or `hbc_mini.c`) for hosts where you can't install Python packages.
+
+Notifications can go to Pushover, email, Mattermost, Matrix, Signal, or VoIP.ms SMS. The dashboard shows host connectivity, RTT graphs, active alerts, and per-host plugin metrics in real time via WebSocket.
+
+---
+
+## Getting started
+
+This tutorial sets up a server on one machine and a client on a second machine. You'll end up with a working dashboard and your first host being monitored.
+
+### 1. Install the server
+
+On the machine that will run `hbd`:
+
+```bash
+git clone https://git.wrede.ca/andreas/heartbeat.git
+cd heartbeat
+python3 -m venv .venv
+source .venv/bin/activate
+pip install .
+```
+
+Verify the install:
+
+```bash
+hbd --help
+```
+
+### 2. Create a server config
+
+Create `~/.hb.yaml`:
+
+```yaml
+hb_port: 50003       # UDP port — clients send heartbeats here
+hbd_port: 50004      # HTTP port — web dashboard and API
+ws_port: 50005       # WebSocket port — live dashboard updates
+
+interval: 20         # Expected heartbeat interval (seconds)
+grace: 2             # Seconds of slack before a host is considered overdue
+
+pickfile: ~/.hb.pick
+pidfile:  ~/.hb.pid
+logfile:  ~/.hb.log
+```
+
+That's enough to get started. No hosts, no users, no notifications needed yet — the server will accept any client that connects.
+
+### 3. Start the server
+
+```bash
+hbd serve -c ~/.hb.yaml -f -v
+```
+
+`-f` keeps it in the foreground so you can watch the log. You should see:
+
+```
+Heartbeat daemon starting on UDP :50003, HTTP :50004, WS :50005
+```
+
+Open `http://your-server:50004/live` in a browser. The dashboard is empty for now.
+
+### 4. Install the client on a host to monitor
+
+On the machine you want to monitor (must be able to reach the server on UDP 50003):
+
+```bash
+pip install hbd      # or: copy scripts/hbc_mini.py if you can't install packages
+```
+
+#### Quick start — no config file
+
+```bash
+hbc your-server.example.com
+```
+
+Within a few seconds the server log will show the host checking in, and it will appear on the dashboard.
+
+#### With a config file
+
+Create `~/.hbc.yaml` on the client host:
+
+```yaml
+hb_port: 50003
+interval: 10         # Send a heartbeat every 10 seconds
+
+plugins:
+  cpu_monitor:
+    interval: 60
+  memory_monitor:
+    interval: 60
+  disk_monitor:
+    interval: 60
+```
+
+Then start the client:
+
+```bash
+hbc -c ~/.hbc.yaml your-server.example.com
+```
+
+Send a boot message at startup so the server logs when the host came up:
+
+```bash
+hbc -b -c ~/.hbc.yaml your-server.example.com
+```
+
+Run as a daemon (logs go to syslog):
+
+```bash
+hbc -d -b -c ~/.hbc.yaml your-server.example.com
+```
+
+### 5. View the dashboard
+
+Open `http://your-server:50004/live`. You'll see the monitored host, its last heartbeat time, and RTT. Click the host name to see plugin metrics.
+
+Navigate to `/plugins/<hostname>` for CPU, memory, and disk graphs.
+
+### 6. Add a notification channel (optional)
+
+Edit `~/.hb.yaml` on the server:
+
+```yaml
+notification_channels:
+  pushover_ops:
+    type: pushover
+    token: YOUR_APP_TOKEN
+    user: YOUR_USER_KEY
+
+users:
+  alice:
+    password: pbkdf2:sha256:...    # generate: hbd passwd alice
+    admin: true
+    notification_channels: [pushover_ops]
+
+default_owner: alice
+```
+
+Generate the password hash:
+
+```bash
+hbd passwd alice
+```
+
+Paste the output into the config, then reload:
+
+```bash
+hbd reload
+```
+
+Test the channel:
+
+```bash
+hbd notify
+```
+
+### 7. Set a threshold alert (optional)
+
+Add to `~/.hb.yaml`:
+
+```yaml
+thresholds:
+  cpu_monitor:
+    cpu_percent:
+      warning: 80.0
+      critical: 90.0
+  disk_monitor:
+    partitions:
+      /:
+        percent:
+          warning: 80.0
+          critical: 90.0
+```
+
+Reload: `hbd reload`. The server will now alert when a monitored host crosses these values.
+
+---
+
+## What's next
+
+| Topic | Where to look |
+|---|---|
+| Full server config reference | [README — Server](https://git.wrede.ca/andreas/heartbeat/src/branch/master/README.md#server-hbd) |
+| Client options and all plugins | [README — Client](https://git.wrede.ca/andreas/heartbeat/src/branch/master/README.md#client-hbc) |
+| Threshold alerting details | [THRESHOLD_ALERTING.md](https://git.wrede.ca/andreas/heartbeat/src/branch/master/docs/THRESHOLD_ALERTING.md) |
+| Notification channels | [NOTIFICATIONS.md](https://git.wrede.ca/andreas/heartbeat/src/branch/master/docs/NOTIFICATIONS.md) |
+| User accounts and roles | [USERS.md](https://git.wrede.ca/andreas/heartbeat/src/branch/master/docs/USERS.md) |
+| Writing a custom plugin | [PLUGIN_DEVELOPMENT.md](https://git.wrede.ca/andreas/heartbeat/src/branch/master/docs/PLUGIN_DEVELOPMENT.md) |
+| Nagios check integration | [NAGIOS_INTEGRATION.md](https://git.wrede.ca/andreas/heartbeat/src/branch/master/docs/NAGIOS_INTEGRATION.md) |
+| REST API | [HTTP_API.md](https://git.wrede.ca/andreas/heartbeat/src/branch/master/docs/HTTP_API.md) |
+| Zero-dependency client | [README — hbc_mini](https://git.wrede.ca/andreas/heartbeat/src/branch/master/README.md#hbc_mini--zero-dependency-client) |

LICENSE.md

@@ -0,0 +1,21 @@
+# MIT License
+
+Copyright (c) 2002 - 2026 Andreas Wrede
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

REFACTORING.md

@@ -1,234 +0,0 @@
-# HBD/HBC Separation Refactoring
-
-## Overview
-
-The heartbeat monitoring system has been refactored into a modular package structure with separate client and server components. This allows users to install only what they need and provides clear separation of concerns.
-
-## New Package Structure
-
-```
-hbd/
-├── __init__.py                 # Main package (minimal)
-├── client/                     # HBC - System monitoring client
-│   ├── __init__.py
-│   ├── main.py                # Entry point (was hbc.py)
-│   ├── config.py              # Client-specific configuration
-│   ├── plugin.py              # Plugin framework
-│   ├── threshold.py           # Threshold checking
-│   └── plugins/               # Monitoring plugins
-│       ├── cpu_monitor.py
-│       ├── disk_monitor.py
-│       ├── memory_monitor.py
-│       ├── network_monitor.py
-│       ├── filesystem_info.py
-│       ├── os_info.py
-│       └── nagios_runner.py
-├── server/                     # HBD - Heartbeat daemon/server
-│   ├── __init__.py
-│   ├── main.py                # Server runtime (was server.py)
-│   ├── cli.py                 # Command-line interface
-│   ├── config.py              # Server-specific configuration
-│   ├── http.py                # HTTP/REST API
-│   ├── ws.py                  # WebSocket server
-│   ├── udp.py                 # UDP heartbeat listener
-│   ├── dns.py                 # DNS update functionality
-│   ├── notify.py              # Notification handlers
-│   ├── monitor.py             # Host monitoring
-│   ├── hbdclass.py            # Host class definitions
-│   ├── journal.py             # Message journaling
-│   ├── templates/             # Jinja2 web templates
-│   └── static/                # Web UI assets
-└── common/                     # Shared utilities
-    ├── __init__.py
-    ├── proto.py               # Protocol encoding/decoding
-    └── utils.py               # Common utilities
-
-## Configuration Files
-
-### Client Configuration (hbd/client/config.py)
-
-Client-specific defaults:
-- `hb_port`: Port where hbd servers listen (default: 50003)
-- `interval`: Heartbeat interval in seconds (default: 10)
-- `plugins`: Per-plugin configuration
-- `thresholds`: Threshold configuration for monitoring
-
-### Server Configuration (hbd/server/config.py)
-
-Server-specific defaults:
-- `hb_port`: Port to listen for heartbeats (default: 50003)
-- `hbd_port`: HTTP API port (default: 50004)
-- `ws_port`: WebSocket port (default: 50005)
-- `logfile`, `logfmt`: Logging configuration
-- `pushsrv`, `pushover_token`, etc.: Notification settings
-- `watchhosts`, `dyndnshosts`: Host monitoring
-- `smtpserver`, etc.: Email settings
-- `journal_*`: Message journaling settings
-
-## Installation Options
-
-### Install Core Only (minimal, PyYAML only)
-```bash
-pip install hbd
-```
-
-### Install Client Only (for monitoring)
-```bash
-pip install hbd[client]
-# Installs: PyYAML, psutil
-```
-
-### Install Server Only (for daemon)
-```bash
-pip install hbd[server]
-# Installs: PyYAML, websockets, mattermostdriver, aiohttp, Jinja2
-```
-
-### Install Everything
-```bash
-pip install hbd[all]
-# Installs all dependencies for both client and server
-```
-
-### Development Installation
-```bash
-pip install -e ".[dev]"
-# Includes all dependencies plus testing/linting tools
-```
-
-## Command-Line Interfaces
-
-### HBC (Client)
-```bash
-hbc [options] host1 [host2 ...]
-
-# Entry point: hbd.client.main:main
-# Location: hbd/client/main.py
-```
-
-### HBD (Server)
-```bash
-hbd [options]
-
-# Entry point: hbd.server.cli:main
-# Location: hbd/server/cli.py → hbd/server/main.py
-```
-
-## Import Changes
-
-### Client Code
-```python
-# Old imports
-from .config import load_config
-from .proto import dicttos, stodict
-from .plugin import PluginRegistry
-
-# New imports
-from .config import load_config          # Still in client/
-from ..common.proto import dicttos       # Moved to common/
-from .plugin import PluginRegistry       # Still in client/
-```
-
-### Server Code
-```python
-# Old imports
-from .config import load_config
-from .proto import stodict
-from .threshold import AlertLevel
-
-# New imports
-from .config import load_config          # Server-specific config
-from ..common.proto import stodict       # Moved to common/
-from ..client.threshold import AlertLevel # Client module
-```
-
-### Plugin Code
-```python
-# Old import
-from hbd.plugin import MonitorPlugin
-
-# New import
-from hbd.client.plugin import MonitorPlugin
-```
-
-## Benefits
-
-1. **Modular Installation**: Install only what you need
-   - Client-only systems don't need web server dependencies
-   - Server-only systems don't need psutil
-   
-2. **Clearer Architecture**: Explicit separation of concerns
-   - Client: System monitoring and data collection
-   - Server: Heartbeat reception, web UI, notifications
-   - Common: Shared protocol and utilities
-
-3. **Independent Evolution**: Client and server can evolve separately
-   - Different release cycles possible
-   - Clear API boundaries via common/
-
-4. **Smaller Footprint**: Reduced dependency installation
-   - Client: ~1 dependency (psutil)
-   - Server: ~4 dependencies (websockets, aiohttp, Jinja2, mattermostdriver)
-
-## Migration Guide
-
-### For Existing Installations
-
-1. **Reinstall the package**:
-   ```bash
-   pip install -e ".[all]"  # For development
-   # or
-   pip install hbd[all]     # For production
-   ```
-
-2. **Configuration files remain unchanged**:
-   - Both client and server read from `~/.hb.yaml`
-   - All existing config keys are supported in both configs
-   - Server has additional keys (journal, websocket, email, etc.)
-   - Client has minimal keys (interval, plugins, thresholds)
-
-3. **Commands remain the same**:
-   - `hbc` command works identically
-   - `hbd` command works identically
-
-### For New Deployments
-
-1. **Client-only system** (monitoring host):
-   ```bash
-   pip install hbd[client]
-   hbc server1.example.com server2.example.com
-   ```
-
-2. **Server-only system** (monitoring daemon):
-   ```bash
-   pip install hbd[server]
-   hbd -c /etc/hbd.yaml -f
-   ```
-
-3. **Combined system** (dev/test):
-   ```bash
-   pip install hbd[all]
-   ```
-
-## Testing
-
-All imports and entry points have been tested and validated:
-- ✅ Package imports work correctly
-- ✅ `hbc` command entry point functional
-- ✅ `hbd` command entry point functional
-- ✅ Optional dependencies properly configured
-- ✅ All internal imports updated
-
-## Files Archived
-
-The following files were renamed to avoid conflicts:
-- `hbd/config.py` → `hbd/config.py.old` (split into client/server configs)
-- `hbd/hbc_old.py` → `hbd/hbc_old.py.bak` (backup file)
-
-## Next Steps
-
-1. Test client functionality with a monitoring host
-2. Test server functionality with web UI and notifications
-3. Update documentation (README.md) with new structure
-4. Consider publishing to PyPI with new structure
-5. Update any deployment scripts/Dockerfiles to use optional dependencies

docs/CONFIG_RELOAD.md

@@ -81,7 +81,6 @@ The following settings **cannot** be reloaded and require a service restart:
 
 - **Logging**
   - `logfile` - Log file path
-  - `logfmt` - Log format
 
 - **Journal Settings**
   - `journal_enabled` - Enable/disable journaling

docs/DARK_MODE.md

@@ -0,0 +1,66 @@
+# Dark Mode
+
+Every page in the Heartbeat web UI supports light mode, dark mode, and automatic (follows the OS/browser setting). Each user picks their preference independently; it is stored in the browser and takes effect immediately without a page reload.
+
+---
+
+## Choosing a theme
+
+Open your profile page (`/profile`) and scroll to the **Appearance** section. Click one of the three buttons:
+
+| Button | Behaviour |
+|--------|-----------|
+| **Auto** | Follows the OS or browser dark-mode preference. Updates live if the system setting changes. |
+| **Light** | Always light, regardless of system setting. |
+| **Dark** | Always dark, regardless of system setting. |
+
+The preference is stored in `localStorage` under the key `hbd_theme` and applies to the current browser only. Clearing browser storage resets it to **Auto**.
+
+---
+
+## Implementation notes
+
+### No flash of unstyled content
+
+A small synchronous `<script>` runs at the very top of `<head>`, before any CSS is parsed, and sets `data-theme="dark"` on `<html>` when the stored preference (or the system setting in auto mode) calls for dark. Because it runs before paint, there is no visible flicker on page load.
+
+### CSS custom properties
+
+All colours are expressed as CSS custom properties defined in `head.html`:
+
+```
+:root                    — light-mode values (default)
+html[data-theme="dark"]  — dark-mode overrides
+```
+
+Key variables:
+
+| Variable | Purpose |
+|----------|---------|
+| `--bg` | Page background |
+| `--surface` | Card / panel background |
+| `--surface-2` / `--surface-3` | Slightly lighter/darker surfaces (table rows, hover states) |
+| `--text` / `--text-sec` / `--text-muted` | Primary, secondary, muted text |
+| `--border` / `--border-2`…`4` | Border shades from prominent to faint |
+| `--link` | Hyperlink and interactive-element colour |
+| `--nav-bg` | Navigation bar background |
+| `--input-bg` / `--input-border` | Form control colours |
+| `--shadow` / `--shadow-sm` | Box-shadow alphas |
+
+A single global rule in `head.html` themes all `<input>`, `<select>`, and `<textarea>` elements across every page at once:
+
+```css
+html[data-theme="dark"] input:not([type=checkbox]):not([type=radio]),
+html[data-theme="dark"] select,
+html[data-theme="dark"] textarea { … }
+```
+
+Each page template adds its own `html[data-theme="dark"]` block for page-specific elements (cards, tables, badges, etc.).
+
+### Auto-mode live updates
+
+A `matchMedia` change listener in `head.html` updates `data-theme` whenever the OS preference changes, so users in **Auto** mode see the theme switch without reloading.
+
+### Semantic colours are unchanged
+
+Alert colours (red for critical, orange for warning, green for ok) and status indicators are intentionally left as fixed values — they are semantic signals, not surface colours, and look correct on both light and dark backgrounds.

docs/HTTP_API.md

@@ -15,12 +15,60 @@ Default port is `50004` (configurable via `hbd_port` in configuration).
 
 ---
 
+## Authentication
+
+When [user accounts are configured](USERS.md), every request must be authenticated.
+
+- **Browser requests** to HTML pages are redirected to `/login` automatically.  JavaScript `fetch()` calls on the dashboards send the session cookie automatically — no JS changes are needed.
+- **API / programmatic requests** must include the token in an `Authorization: Bearer <token>` header or an `X-Auth-Token` header.
+
+Unauthenticated API requests receive `401 Unauthorized`.  When no users are configured the server runs in unauthenticated mode and all endpoints are open.
+
+### Login
+
+```bash
+TOKEN=$(curl -s -X POST http://localhost:50004/api/0/auth/login \
+  -H 'Content-Type: application/json' \
+  -d '{"username":"alice","password":"secret"}' | jq -r .token)
+
+curl -H "Authorization: Bearer $TOKEN" http://localhost:50004/api/0/hosts
+```
+
+See [User Management](USERS.md) for full authentication documentation.
+
+---
+
 ## API Endpoints
 
+### Authentication
+
+| Method | Path | Description | Auth required |
+|--------|------|-------------|---------------|
+| `POST` | `/api/0/auth/login` | Obtain session token | No |
+| `POST` | `/api/0/auth/logout` | Invalidate session | Token |
+
+### Users
+
+| Method | Path | Description | Role |
+|--------|------|-------------|------|
+| `GET` | `/api/0/users` | List all users | Admin |
+| `GET` | `/api/0/users/me` | Own profile | Authenticated |
+| `PUT` | `/api/0/users/me` | Update own profile | Authenticated |
+
+### Notification Channels
+
+| Method | Path | Description | Role |
+|--------|------|-------------|------|
+| `GET` | `/api/0/notification_channel_types` | Channel type schemas | Authenticated |
+| `GET` | `/api/0/notification_channels` | List visible channels | Authenticated |
+| `POST` | `/api/0/notification_channels` | Create a channel | Authenticated |
+| `PUT` | `/api/0/notification_channels/{name}` | Update a channel | Owner or Admin |
+| `DELETE` | `/api/0/notification_channels/{name}` | Delete a channel | Owner or Admin |
+
 ### Host Management
 
 #### GET /api/0/hosts
-Get list of all monitored hosts with their state information.
+Get list of all monitored hosts with their state information.  When auth is enabled, only hosts the caller has at least **monitor** access to are returned.
 
 **Response:**
 ```json
@@ -28,6 +76,9 @@ Get list of all monitored hosts with their state information.
   {
     "name": "webserver01",
     "dyn": false,
+    "owner": "alice",
+    "managers": ["bob"],
+    "monitors": ["carol"],
     "connections": [...]
   }
 ]
@@ -137,6 +188,127 @@ curl http://localhost:50004/api/0/hosts/database01/plugins/disk_monitor
 
 ---
 
+### Host Access
+
+#### GET /api/0/hosts/{hostname}/access
+Get owner/managers/monitors for a host. Requires **monitor** role or higher.
+
+**Response:**
+```json
+{
+  "owner": "alice",
+  "managers": ["bob"],
+  "monitors": ["carol"]
+}
+```
+
+#### PUT /api/0/hosts/{hostname}/access
+Update owner/managers/monitors. Requires **owner** role or admin.
+
+**Request body** (all fields optional):
+```json
+{ "owner": "bob", "managers": ["carol"], "monitors": [] }
+```
+
+Changes take effect immediately but are not written back to the config file. Update the config file and send `SIGHUP` to make them permanent.
+
+---
+
+---
+
+### Notification Channel Endpoints
+
+Channels are visible to all users by default. Channels marked `private: true` are only visible to their owner. Admins see all channels.
+
+#### GET /api/0/notification_channel_types
+Return the schema for every supported notifier type. Used by the web UI to dynamically render the channel creation form.
+
+**Response:**
+```json
+{
+  "pushover": {
+    "label": "Pushover",
+    "fields": [
+      {"key": "token",  "label": "App token",  "type": "secret", "required": true},
+      {"key": "user",   "label": "User key",   "type": "secret", "required": true},
+      {"key": "sound",  "label": "Sound",      "type": "text",   "required": false}
+    ]
+  },
+  "email": { "label": "E-mail", "fields": [ ... ] },
+  ...
+}
+```
+
+---
+
+#### GET /api/0/notification_channels
+List channels visible to the current user (public channels + own private channels). Admins receive all channels.
+
+**Response:**
+```json
+[
+  {
+    "name": "pushover_ops",
+    "type": "pushover",
+    "type_label": "Pushover",
+    "owner": null,
+    "private": false,
+    "min_level": "WARNING",
+    "fields": [
+      {"key": "token", "label": "App token", "value": "•••", "sensitive": true},
+      {"key": "user",  "label": "User key",  "value": "•••", "sensitive": true}
+    ]
+  }
+]
+```
+
+Sensitive fields (`type: "secret"`) are always returned as `"•••"`.
+
+---
+
+#### POST /api/0/notification_channels
+Create a new channel. The creating user becomes the channel's `owner`.
+
+**Request body:**
+```json
+{
+  "name": "my_pushover",
+  "type": "pushover",
+  "token": "app-token",
+  "user": "user-key",
+  "min_level": "WARNING",
+  "private": true
+}
+```
+
+**Response:** `{"ok": true, "name": "my_pushover"}`
+
+**Status codes:** `200 OK`, `400` (missing required field or unknown type), `409` (name already exists)
+
+---
+
+#### PUT /api/0/notification_channels/{name}
+Update an existing channel. Only the channel owner or an admin may update it.
+
+Secret fields sent as `"•••"` are preserved from the existing config (same pattern as OAuth secrets in the admin config editor).
+
+**Request body:** same shape as POST, `name` ignored (taken from URL).
+
+**Response:** `{"ok": true}`
+
+**Status codes:** `200 OK`, `403 Forbidden`, `404 Not Found`
+
+---
+
+#### DELETE /api/0/notification_channels/{name}
+Delete a channel. Only the channel owner or an admin may delete it.
+
+**Response:** `{"ok": true}`
+
+**Status codes:** `200 OK`, `403 Forbidden`, `404 Not Found`
+
+---
+
 ### Alert Endpoints
 
 #### GET /api/0/hosts/{hostname}/alerts
@@ -226,6 +398,16 @@ curl http://localhost:50004/api/0/alerts | jq .
 
 ## Web UI Pages
 
+### Login
+**URL:** `/login`
+
+Shown automatically when a browser request is made without a valid session (when users are configured). After successful login the browser is redirected to the originally requested page.
+
+### Logout
+**URL:** `/logout`
+
+Clears the session cookie and redirects to `/login`.
+
 ### Live Dashboard
 **URL:** `/live`
 
@@ -288,7 +470,13 @@ Comprehensive alert monitoring:
 #!/bin/bash
 # Check for critical alerts and send notification
 
-RESPONSE=$(curl -s http://localhost:50004/api/0/alerts)
+# Log in first (when auth is configured)
+TOKEN=$(curl -s -X POST http://localhost:50004/api/0/auth/login \
+  -H 'Content-Type: application/json' \
+  -d '{"username":"monitor","password":"secret"}' | jq -r .token)
+AUTH="-H \"Authorization: Bearer $TOKEN\""
+
+RESPONSE=$(curl -s $AUTH http://localhost:50004/api/0/alerts)
 CRITICAL_COUNT=$(echo "$RESPONSE" | jq '.summary.critical')
 
 if [ "$CRITICAL_COUNT" -gt 0 ]; then
@@ -305,8 +493,16 @@ fi
 import requests
 import json
 
+BASE = 'http://localhost:50004'
+
+# Log in (skip if auth not configured)
+resp = requests.post(f'{BASE}/api/0/auth/login',
+                     json={"username": "alice", "password": "secret"})
+token = resp.json().get("token")
+headers = {"Authorization": f"Bearer {token}"} if token else {}
+
 # Get all plugin data for a host
-response = requests.get('http://localhost:50004/api/0/hosts/webserver01/plugins')
+response = requests.get(f'{BASE}/api/0/hosts/webserver01/plugins', headers=headers)
 data = response.json()
 
 print(f"Host: {data['hostname']}")
@@ -318,7 +514,7 @@ for plugin, info in data['plugins'].items():
         print(f"  {metric}: {value}")
 
 # Check for alerts
-response = requests.get('http://localhost:50004/api/0/alerts')
+response = requests.get(f'{BASE}/api/0/alerts', headers=headers)
 alerts = response.json()
 
 if alerts['summary']['critical'] > 0:
@@ -389,6 +585,8 @@ API errors return appropriate HTTP status codes with JSON:
 **Common Status Codes:**
 - `200 OK` - Success
 - `400 Bad Request` - Invalid parameters
+- `401 Unauthorized` - Missing or invalid session token
+- `403 Forbidden` - Authenticated but insufficient role
 - `404 Not Found` - Resource not found
 - `500 Internal Server Error` - Server error
 
@@ -506,6 +704,14 @@ for route in list(app.router.routes()):
 
 ## Troubleshooting
 
+### API Returns 401
+- Auth is configured — include `Authorization: Bearer <token>` header
+- Token may have expired (24 h TTL) — log in again
+
+### API Returns 403
+- Authenticated user lacks the required role for this host/action
+- Check host's `owner`, `managers`, `monitors` config
+
 ### API Returns 404
 - Verify hostname in URL matches actual host name
 - Check host is sending heartbeats: `curl http://localhost:50004/api/0/hosts`
@@ -525,6 +731,7 @@ for route in list(app.router.routes()):
 
 ## See Also
 
+- [User Management](USERS.md)
 - [Plugin Development Guide](PLUGIN_DEVELOPMENT.md)
 - [Threshold Alerting Documentation](THRESHOLD_ALERTING.md)
 - [Message Journal Documentation](MESSAGE_JOURNAL.md)

docs/NAGIOS_INTEGRATION.md

@@ -104,11 +104,6 @@ The `nagios_runner` plugin collects:
 - `{name}_{metric}_min` - Minimum value (if present)
 - `{name}_{metric}_max` - Maximum value (if present)
 
-**Overall:**
-- `overall_status` - Worst status from all commands
-- `overall_status_code` - Worst status code
-- `plugin_count` - Number of Nagios plugins executed
-
 ## Configuration Options
 
 ```yaml

docs/NOTIFICATIONS.md

@@ -2,532 +2,324 @@
 
 ## Overview
 
-The Heartbeat Monitoring System includes a flexible notification system that can send alerts through multiple channels including Email, Pushover, Signal, and Mattermost. The system supports centralized channel definitions with per-host routing, allowing fine-grained control over notification delivery.
+Notifications are dispatched to the **owner and managers** of a host, each via their own configured notification channels. Channel definitions are global; users reference them by name. No users configured → no notifications sent.
 
 ## Architecture
 
-### Components
+```
+Alert event (udp.py / threshold.py)
+  └─ notify.send_notification(host_name, Notification)
+       ├─ look up host.owner + host.managers
+       ├─ for each user → user.notification_channels
+       └─ for each channel → _dispatch_to_channel (filtered by min_level)
+```
 
-1. **Notification Channels** (`notification_channels` in config)
+Every notification carries:
-   - Centralized definitions of notification providers
+- **title** — `[LEVEL] hostname` (e.g. `[CRITICAL] webserver01`)
-   - Each channel has a type and type-specific credentials
+- **body** — detail message (metric value, threshold, duration)
-   - Reusable across multiple hosts
+- **url** — link to the plugin metrics page (`{base_url}/plugins#{hostname}`)
-
+- **level** — `RECOVER | WARNING | CRITICAL | INFO`
-2. **Channel Dispatcher** (`hbd/server/notify.py`)
-   - `pushmsg_for_host(hostname, message)`: Main entry point for host-specific notifications
-   - `_dispatch_to_channel(channel_name, channel_config, message)`: Routes to specific provider
-   - Provider functions: `pushover()`, `pushsignal()`, `pushmattermost()`, `send_email()`
-
-3. **Configuration Utilities** (`hbd/server/config.py`)
-   - `get_notification_channels_for_host(config, hostname)`: Retrieves channel names for a host
-   - `get_notification_channels_config(config, hostname)`: Retrieves full channel configurations
-   - `get_channel_config(config, channel_name)`: Gets configuration for a specific channel
-
-4. **Integration Points**
-   - **Threshold alerts**: `threshold.py` calls `notify_mod.pushmsg_for_host()`
-   - **Heartbeat events**: `udp.py` calls `notify_mod.pushmsg_for_host()` for boot/shutdown/overdue
-   - **Custom alerts**: Any code can call `notify_mod.pushmsg_for_host(hostname, message)`
 
 ## Configuration
 
-### Centralized Channel Definitions
+### Base URL
 
-Define notification channels once in your configuration file:
+Set `base_url` so notification links point to your hbd instance:
+
+```yaml
+base_url: https://hbd.example.com
+```
+
+### Channel definitions
+
+Channels are defined under `notification_channels`. Each entry specifies a delivery type and its credentials. Two optional metadata fields control visibility:
+
+| Field | Default | Description |
+|---|---|---|
+| `owner` | *(absent)* | Username who created/owns this channel. Absent = admin-created. |
+| `private` | `false` | When `true`, only the owner can see and select this channel. |
+| `min_level` | `WARNING` | Minimum alert level this channel receives. |
+
+**Admin-created channels** (set in the config file or via the admin settings UI) are public by default — all users can select them:
 
 ```yaml
 notification_channels:
-  # Signal notifications
+
-  signal_ops:
+  pushover_ops:
-    type: signal
+    type: pushover
-    cli_path: /usr/local/bin/signal-cli
+    token: your-app-token
-    user: +1234567890        # Your Signal number
+    user: your-user-key
-    recipient: +1234567890   # Recipient number
+    min_level: WARNING
-  
+
-  signal_oncall:
-    type: signal
-    cli_path: /usr/local/bin/signal-cli
-    user: +1234567890
-    recipient: +0987654321   # Different recipient
-  
-  # Email notifications
   email_ops:
     type: email
-    recipients:
+    recipients: [ops@example.com]
-      - ops@example.com
+    sender: hbd@example.com
-      - alerts@example.com
-    sender: heartbeat@example.com
     smtp_server: smtp.example.com
     smtp_port: 587
-    smtp_user: heartbeat@example.com
+    smtp_user: hbd@example.com
-    smtp_password: your-smtp-password
+    smtp_password: secret
-  
+    min_level: WARNING
-  email_devteam:
-    type: email
-    recipients: [dev-alerts@example.com]
-    sender: heartbeat-dev@example.com
-    smtp_server: smtp.example.com
-    smtp_port: 587
-    smtp_user: heartbeat-dev@example.com
-    smtp_password: your-smtp-password
-  
-  # Pushover notifications
-  pushover_urgent:
-    type: pushover
-    token: your-pushover-app-token
-    user: your-pushover-user-key
-  
-  pushover_normal:
-    type: pushover
-    token: your-pushover-app-token
-    user: another-user-key
-  
-  # Mattermost notifications
-  mattermost_devops:
-    type: mattermost
-    host: mattermost.example.com
-    token: your-webhook-token
-    channel: devops-alerts
-    username: heartbeat-bot
-    icon: https://example.com/heartbeat-icon.png
-```
 
-### Default Notification Channels
+  matrix_oncall:
+    type: matrix
+    homeserver: https://matrix.example.org
+    access_token: syt_xxx
+    room_id: "!abc:matrix.example.org"
+    min_level: CRITICAL
 
-Specify default channels for hosts that don't have specific channel assignments:
+  sms_oncall:
+    type: sms_voipms
+    api_user: me@example.com
+    api_password: secret
+    did: "5551234567"
+    dst: "5559876543"
+    min_level: CRITICAL
 
-```yaml
+  signal_ops:
-default_notification_channels:
-  - email_ops
-  - mattermost_devops
-```
-
-Hosts without `notification_channels` defined will use these defaults.
-
-### Per-Host Channel Assignment
-
-Assign specific channels to each host in the `hosts` section:
-
-```yaml
-hosts:
-  # Critical production web server - multiple channels for redundancy
-  prod-web-01:
-    threshold_config: high_sensitivity
-    watch: true
-    notification_channels:
-      - signal_oncall        # Immediate mobile notification
-      - pushover_urgent      # Secondary mobile notification
-      - email_ops            # Email for record keeping
-    dyndns: false
-  
-  # Database server - ops team notifications only
-  prod-db-01:
-    threshold_config: database
-    watch: true
-    notification_channels:
-      - signal_ops
-      - email_ops
-    dyndns: false
-  
-  # Development server - email only, no urgent notifications
-  dev-server-01:
-    threshold_config: low_sensitivity
-    watch: false
-    notification_channels:
-      - email_devteam
-    dyndns: false
-  
-  # Test server - uses default_notification_channels
-  test-server-01:
-    threshold_config: default
-    watch: false
-    dyndns: false
-    # No notification_channels specified = uses default_notification_channels
-```
-
-## Channel Types
-
-### Email
-
-Sends notifications via SMTP.
-
-**Configuration fields:**
-```yaml
-type: email
-recipients: [email1@example.com, email2@example.com]  # Required: List of recipients
-sender: heartbeat@example.com                         # Required: From address
-smtp_server: smtp.example.com                         # Required: SMTP server hostname
-smtp_port: 587                                        # Optional: Default 587
-smtp_user: heartbeat@example.com                      # Optional: For authenticated SMTP
-smtp_password: your-password                          # Optional: For authenticated SMTP
-```
-
-**Features:**
-- Supports multiple recipients
-- TLS/STARTTLS support on port 587
-- Authenticated and unauthenticated SMTP
-
-**Example:**
-```yaml
-notification_channels:
-  email_critical:
-    type: email
-    recipients: [admin@example.com, oncall@example.com]
-    sender: alerts@example.com
-    smtp_server: smtp.fastmail.com
-    smtp_port: 587
-    smtp_user: alerts@example.com
-    smtp_password: app-specific-password
-```
-
-### Pushover
-
-Sends push notifications to mobile devices via Pushover API.
-
-**Configuration fields:**
-```yaml
-type: pushover
-token: your-application-token    # Required: Your Pushover app token
-user: your-user-key              # Required: Recipient's user key
-```
-
-**Features:**
-- Instant mobile push notifications
-- Works on iOS and Android
-- Supports delivery confirmations
-
-**Setup:**
-1. Create a Pushover account at https://pushover.net
-2. Create an application to get your app token
-3. Note your user key from your account dashboard
-
-**Example:**
-```yaml
-notification_channels:
-  pushover_admin:
-    type: pushover
-    token: azGDORePK8gMaC0QOYAMyEEuzJnyUi
-    user: uQiRzpo4DXghDmr9QzzfQu27cmVRsG
-```
-
-### Signal
-
-Sends notifications via Signal messenger using signal-cli.
-
-**Configuration fields:**
-```yaml
-type: signal
-cli_path: /usr/local/bin/signal-cli    # Optional: Path to signal-cli binary
-user: +1234567890                       # Required: Your Signal phone number
-recipient: +0987654321                  # Required: Recipient phone number
-```
-
-**Prerequisites:**
-1. Install signal-cli: https://github.com/AsamK/signal-cli
-2. Register signal-cli with your phone number:
-   ```bash
-   signal-cli -u +1234567890 register
-   signal-cli -u +1234567890 verify CODE
-   ```
-3. Ensure signal-cli is in PATH or specify full path in config
-
-**Features:**
-- End-to-end encrypted messaging
-- Works without phone being online
-- No API fees or rate limits
-
-**Example:**
-```yaml
-notification_channels:
-  signal_admin:
     type: signal
     cli_path: /usr/local/bin/signal-cli
     user: +12025551234
     recipient: +12025559999
+
+  mattermost_devops:
+    type: mattermost
+    host: mattermost.example.com
+    token: webhook-token
+    channel: devops-alerts
+    username: heartbeat-bot
 ```
 
-### Mattermost
+**User-created channels** are written by authenticated users through the API or their profile page. They carry an `owner` field and optionally `private: true`:
 
-Sends notifications to Mattermost team chat via incoming webhooks.
-
-**Configuration fields:**
-```yaml
-type: mattermost
-host: mattermost.example.com           # Required: Mattermost server hostname
-token: your-webhook-token               # Required: Incoming webhook token
-channel: channel-name                   # Required: Target channel name
-username: heartbeat-bot                 # Optional: Bot display name
-icon: https://example.com/icon.png      # Optional: Bot icon URL
-```
-
-**Prerequisites:**
-1. Enable incoming webhooks in Mattermost
-2. Create an incoming webhook for your team
-3. Note the webhook token from the webhook URL
-
-**Features:**
-- Team-wide visibility
-- Rich formatting support
-- Message threading
-
-**Example:**
 ```yaml
 notification_channels:
-  mattermost_ops:
+
-    type: mattermost
+  alice_personal:
-    host: chat.example.com
+    type: pushover
-    token: abc123def456ghi789
+    token: personal-token
-    channel: infrastructure-alerts
+    user: personal-key
-    username: heartbeat-monitor
+    owner: alice          # created by alice
-    icon: https://example.com/heartbeat-icon.png
+    private: true         # only alice can see this channel
 ```
 
-## Notification Events
+### Channel visibility
 
-The system sends notifications for various events:
+| Channel | Who can see / select it |
+|---|---|
+| No `private` field (or `private: false`) | All users |
+| `private: true` | Only the `owner` |
+| Any channel | Admins always see everything |
 
-### Threshold Alerts
+### Users with notification channels
 
-When monitored metrics exceed configured thresholds:
+Each user lists which channels they receive notifications on. Users can manage their own selection from the profile page:
 
-- **State changes**: OK → WARNING, WARNING → CRITICAL, CRITICAL → OK
+```yaml
-- **Format**: `{LEVEL}: {hostname} - {metric_path} = {value} {threshold_info}`
+users:
-- **Example**: `CRITICAL: prod-web-01 - cpu_monitor.cpu_percent = 95.2 (threshold: > 90.0)`
+  alice:
-- **Re-notifications**: Periodic reminders for ongoing alerts (default: hourly)
+    full_name: Alice Smith
+    password: pbkdf2:sha256:...
+    admin: true
+    notification_channels: [pushover_ops, email_ops]
 
-### Heartbeat Events
+  bob:
-
+    full_name: Bob Jones
-Host lifecycle events:
+    password: pbkdf2:sha256:...
-
+    notification_channels: [sms_oncall, matrix_oncall]
-- **Host boot**: `{hostname} booted`
-- **Host shutdown**: `{hostname} {connection_type} shutdown`
-- **Host recovery**: `{hostname} {connection_type} is back`
-- **Connection issues**: `{hostname} {message}`
-- **Host overdue**: `{hostname} {connection_type} overdue`
-
-Only hosts with `watch: true` send heartbeat event notifications.
-
-### Custom Alerts
-
-Application code can send custom notifications:
-
-```python
-from hbd.server import notify as notify_mod
-
-# Send to host-specific channels
-notify_mod.pushmsg_for_host("prod-web-01", "Custom alert message")
-
-# Send using global config
-notify_mod.pushmsg_from_config("Global notification")
-
-# Send to specific config
-notify_mod.pushmsg(custom_config_dict, "Targeted notification")
 ```
 
-## Design Principles
+### Host access — owner and managers
 
-The notification system follows these core principles:
+Notifications for a host go to its owner and all managers:
-
-- **Centralization**: Define notification providers once, reference them by name
-- **Flexibility**: Each host can use different channels for different notification needs
-- **Redundancy**: Critical hosts can specify multiple channels for failover
-- **Clarity**: Clean separation between channel definition and channel assignment
-- **Type Safety**: Provider-specific validation at configuration time
-
-## Best Practices
-
-### Channel Organization
-
-- **Create purpose-specific channels**: `email_ops`, `signal_oncall`, `pushover_urgent`
-- **Separate by team/role**: `email_devteam`, `signal_dbateam`, `mattermost_security`
-- **Use descriptive names**: Channel names appear in logs and debugging
-
-### Redundancy
-
-For critical hosts, use multiple notification channels:
 
 ```yaml
 hosts:
-  critical-db:
+  webserver01:
-    notification_channels:
+    owner: alice             # receives all notifications for this host
-      - signal_oncall      # Primary: Mobile alert
+    managers: [bob]          # also receives notifications
-      - pushover_urgent    # Backup: Different mobile platform
+    threshold_config: default
-      - email_ops          # Tertiary: Email for record-keeping
+    watch: true              # bold in dashboard (cosmetic only)
+    dyndns: false
+
+  dbserver01:
+    owner: alice
+    managers: [bob]
+    threshold_config: database
+    dyndns: false
 ```
 
-### Notification Fatigue Prevention
+`watch: true` only affects display (bold name in the live dashboard). Notifications are now controlled entirely by owner/managers.
 
-- **Use `watch: false`** for non-critical hosts
+## Channel Types
-- **Configure appropriate thresholds** to avoid false positives
-- **Set different channels for different severities**
-- **Use `default_notification_channels`** for baseline, add more for critical systems
 
-### Security
+### `min_level` filtering
 
-- **Protect credentials**: Use file permissions to protect config files with passwords/tokens
+Every channel accepts an optional `min_level` field:
-- **Rotate tokens**: Periodically rotate API tokens and passwords
-- **Use app-specific passwords**: For email, use app-specific passwords instead of main account password
-- **Separate accounts**: Consider separate notification accounts for different environments (prod vs dev)
 
-### Testing
+| Value | Channels receive |
+|---|---|
+| `WARNING` (default) | WARNING, CRITICAL, RECOVER |
+| `CRITICAL` | CRITICAL only (and RECOVER) |
 
-Test notification channels before relying on them:
+`RECOVER` is always passed through — you don't want to miss a recovery.
 
+### pushover
+
+Sends push notifications via [Pushover](https://pushover.net). Includes title, body, and a clickable URL.
+
+```yaml
+type: pushover
+token: your-app-token     # Required: Pushover application token
+user: your-user-key       # Required: Recipient's user key
+min_level: WARNING
+```
+
+### email
+
+Sends via SMTP. Subject = title, body = message + URL on final line.
+
+```yaml
+type: email
+recipients: [ops@example.com, oncall@example.com]
+sender: hbd@example.com
+smtp_server: smtp.example.com
+smtp_port: 587             # 587 = STARTTLS (default), 465 = SSL
+smtp_user: hbd@example.com
+smtp_password: secret
+min_level: WARNING
+```
+
+### matrix
+
+Sends a formatted HTML message to a Matrix room via [matrix-nio](https://github.com/poljar/matrix-nio).
+
+```yaml
+type: matrix
+homeserver: https://matrix.example.org
+access_token: syt_xxx      # Bot account access token
+room_id: "!abc:matrix.example.org"
+min_level: WARNING
+```
+
+**Setup:**
+1. Create a bot Matrix account
+2. Obtain its access token (Element → Settings → Help & About → Access Token)
+3. Invite the bot to the target room and note the room ID
+
+### sms_voipms
+
+Sends SMS via the [voip.ms REST API](https://voip.ms/api/v1/rest.php). Message is truncated to 160 characters.
+
+```yaml
+type: sms_voipms
+api_user: me@example.com   # voip.ms account email
+api_password: secret       # voip.ms API password
+did: "5551234567"          # Your voip.ms DID (sending number)
+dst: "5559876543"          # Destination number
+min_level: CRITICAL
+```
+
+### signal
+
+Sends via [signal-cli](https://github.com/AsamK/signal-cli).
+
+```yaml
+type: signal
+cli_path: /usr/local/bin/signal-cli
+user: +12025551234         # Your registered Signal number
+recipient: +12025559999    # Recipient number
+min_level: WARNING
+```
+
+**Setup:**
 ```bash
-# Test signal-cli directly
+signal-cli -u +12025551234 register
-signal-cli -u +1234567890 send -m "Test message" +0987654321
+signal-cli -u +12025551234 verify CODE
-
-# Test SMTP
-echo "Test" | mail -s "Test Subject" admin@example.com
-
-# Test through heartbeat system (Python REPL)
-from hbd.server import notify as notify_mod, config as config_mod
-cfg = config_mod.load_config(".hb.yaml")
-notify_mod.setup(cfg)
-notify_mod.pushmsg_for_host("test-host", "Test notification")
 ```
 
+### mattermost
+
+Sends via Mattermost incoming webhook. Message is formatted as Markdown.
+
+```yaml
+type: mattermost
+host: mattermost.example.com
+token: your-webhook-token
+channel: devops-alerts
+username: heartbeat-bot    # Optional: display name
+icon: https://…/icon.png   # Optional: bot icon URL
+min_level: WARNING
+```
+
+## Notification events
+
+| Source | Level | Title example | Body example |
+|---|---|---|---|
+| Host overdue | CRITICAL | `[CRITICAL] webserver01` | `IPv4 overdue` |
+| Host recover | RECOVER | `[RECOVER] webserver01` | `IPv4 back after being overdue for 5:23` |
+| Host boot | INFO | `[INFO] webserver01` | `webserver01 booted` |
+| Host shutdown | INFO | `[INFO] webserver01` | `IPv4 shutdown` |
+| Threshold breach | WARNING/CRITICAL | `[CRITICAL] webserver01` | `cpu_percent = 95.2 (threshold: > 90.0)` |
+| Threshold reminder | CRITICAL | `[REMINDER/CRITICAL] webserver01` | `REMINDER (CRITICAL): … ongoing for 3600s` |
+| Connection issue | WARNING | `[WARNING] webserver01` | `new address detected …` |
+
+Reminder notifications (re-notify) are sent only for CRITICAL level alerts.
+
+## API reference
+
+### `send_notification(host_name, notif) -> dict`
+
+Main entry point. Dispatches to owner + managers.
+
+```python
+from hbd.server.notify import send_notification, Notification
+
+send_notification(
+    "webserver01",
+    Notification(
+        title="[CRITICAL] webserver01",
+        body="cpu_percent = 95.2 (threshold: > 90.0)",
+        level="CRITICAL",
+        url="https://hbd.example.com/plugins#webserver01",
+    ),
+)
+```
+
+Returns `{channel_name: bool}` for each channel dispatched.
+
+### `setup(cfg, loop=None)`
+
+Called once at startup from `main.py`. Pass the running asyncio event loop so Matrix sends work correctly.
+
 ## Troubleshooting
 
-### Notifications Not Sending
+**No notifications sent:**
+- Check that users are configured (`users:` section in yaml)
+- Check that the host has an `owner` or `managers` set
+- Check that users have `notification_channels` listed
+- Check that the channel names in user config match keys under `notification_channels:`
+- If a user can't select a channel, check whether it is `private: true` and owned by someone else
 
-1. **Check logs**: Look for "Failed to send notification" errors
+**min_level filtering too aggressive:**
-2. **Verify host is watched**: Ensure `watch: true` in host definition
+- Default is `WARNING` — both WARNING and CRITICAL are sent
-3. **Check channel configuration**: Verify credentials and settings
+- Set `min_level: WARNING` explicitly if you were expecting warnings but set CRITICAL
-4. **Test channel directly**: Use command-line tools to test provider
-5. **Check network**: Ensure server can reach notification endpoints
 
-### Signal Issues
+**Matrix sends time out:**
+- Verify the access token is valid and the bot is in the room
+- `matrix-nio` must be installed: `pip install matrix-nio`
 
-- **signal-cli not found**: Specify full path in `cli_path`
+**voip.ms SMS fails:**
-- **Not registered**: Run `signal-cli -u +NUMBER register` and verify
+- Enable the API in your voip.ms account (Account → API)
-- **Trust issues**: Run `signal-cli -u +NUMBER receive` to sync trust store
+- Verify the DID is SMS-capable in your voip.ms account
-- **Recipient not found**: Ensure recipient is in your Signal contacts
 
-### Email Issues
+**Signal not found:**
+- Specify full `cli_path`
+- Run `signal-cli -u +NUMBER receive` to sync trust store
 
-- **Authentication failed**: Check SMTP username/password
+**Email authentication failed:**
-- **TLS errors**: Verify SMTP port (587 for STARTTLS, 465 for SSL)
+- Use app-specific passwords for Gmail/Fastmail
-- **Relay denied**: Ensure SMTP server allows relay from your IP
+- Verify port: 587 for STARTTLS, 465 for SSL
-- **Timeout**: Check firewall rules for SMTP ports
 
-### Pushover Issues
+**Pushover `400` errors:**
-
+- Double-check `token` (app) and `user` (user key) — they are different values
-- **Invalid token/user**: Verify token and user key from Pushover dashboard
-- **API rate limits**: Pushover has monthly message limits on free tier
-- **HTTP errors**: Check Pushover API status page
-
-### Mattermost Issues
-
-- **Webhook not found**: Verify webhook token and ensure webhook is enabled
-- **Channel not found**: Check channel name spelling and permissions
-- **Driver import error**: Install mattermostdriver: `pip install mattermostdriver`
-
-## API Reference
-
-### Main Functions
-
-#### `pushmsg_for_host(hostname: str, msg: str, debug: int = 0) -> dict`
-
-Send notification to host-specific channels.
-
-**Parameters:**
-- `hostname`: Name of the host (used to look up notification channels)
-- `msg`: Message to send
-- `debug`: Debug level (0=no debug, 1+=debug output)
-
-**Returns:** Dictionary of results per channel: `{"signal_ops": True, "email_ops": False}`
-
-**Example:**
-```python
-from hbd.server import notify as notify_mod
-
-notify_mod.pushmsg_for_host("prod-web-01", "Server CPU at 95%")
-```
-
-**Behavior:**
-1. Looks up notification channels configured for the host
-2. If no host-specific channels, uses `default_notification_channels`
-3. Dispatches to each channel in parallel
-4. Returns dict of results keyed by channel name
-5. Logs success/failure for each channel
-
-## Examples
-
-### Complete Configuration Example
-
-```yaml
-# Notification channel definitions
-notification_channels:
-  signal_oncall:
-    type: signal
-    cli_path: /usr/local/bin/signal-cli
-    user: +12025551234
-    recipient: +12025555678
-  
-  email_ops:
-    type: email
-    recipients: [ops@example.com, alerts@example.com]
-    sender: heartbeat@example.com
-    smtp_server: smtp.fastmail.com
-    smtp_port: 587
-    smtp_user: heartbeat@example.com
-    smtp_password: app-password-here
-
-# Default channels
-default_notification_channels: [email_ops]
-
-# Host definitions with channel assignments
-hosts:
-  prod-web-01:
-    threshold_config: high_sensitivity
-    watch: true
-    notification_channels: [signal_oncall, email_ops]
-    dyndns: false
-  
-  dev-server-01:
-    threshold_config: low_sensitivity
-    watch: false
-    notification_channels: [email_ops]
-    dyndns: false
-```
-
-### Multiple Environments Example
-
-```yaml
-notification_channels:
-  # Production channels
-  signal_prod_oncall:
-    type: signal
-    user: +12025551234
-    recipient: +12025551111  # On-call phone
-  
-  email_prod_ops:
-    type: email
-    recipients: [prod-ops@example.com]
-    sender: prod-heartbeat@example.com
-    smtp_server: smtp.example.com
-  
-  # Staging channels
-  email_staging:
-    type: email
-    recipients: [staging-alerts@example.com]
-    sender: staging-heartbeat@example.com
-    smtp_server: smtp.example.com
-  
-  # Development channels
-  mattermost_dev:
-    type: mattermost
-    host: chat.example.com
-    token: dev-webhook-token
-    channel: dev-alerts
-
-hosts:
-  prod-api-01:
-    notification_channels: [signal_prod_oncall, email_prod_ops]
-  
-  staging-api-01:
-    notification_channels: [email_staging]
-  
-  dev-api-01:
-    notification_channels: [mattermost_dev]
-```

docs/PLUGIN_DEVELOPMENT.md

@@ -8,6 +8,7 @@ This guide explains how to create custom plugins for the Heartbeat monitoring sy
 - [Plugin Types](#plugin-types)
 - [Creating a Plugin](#creating-a-plugin)
 - [Plugin Lifecycle](#plugin-lifecycle)
+- [Server-initiated InfoPlugin refresh](#server-initiated-infoplugin-refresh)
 - [Configuration](#configuration)
 - [Best Practices](#best-practices)
 - [Examples](#examples)
@@ -250,6 +251,28 @@ Understanding the plugin lifecycle helps you implement plugins correctly:
    └─> Plugin releases resources, closes connections
 ```
 
+## Server-initiated InfoPlugin refresh
+
+When a heartbeat packet arrives from a host the server has no plugin data for (e.g. after a server restart), the server sets `request_update = 1` in the ACK reply. The client detects this flag and immediately re-runs all InfoPlugins — clearing their cached results first — then resends the data as PLG messages.
+
+This means InfoPlugin data will always reach the server as soon as possible without requiring a client restart. No action is needed from plugin authors: the framework handles cache invalidation and re-collection automatically.
+
+The lifecycle for this case looks like:
+
+```
+Server restarts, host reconnects
+   └─> hbd receives HTB with no existing plugin_data for host
+   └─> hbd sets request_update=1 in ACK
+
+Client receives ACK
+   └─> Detects request_update flag
+   └─> Clears _cache on every registered InfoPlugin
+   └─> Calls collect() on each InfoPlugin
+   └─> Sends fresh PLG messages to server
+```
+
+If you write an `InfoPlugin` with side effects in `_collect_info()` (opening connections, writing files, etc.), be aware it may be called more than once per client session when this mechanism triggers.
+
 ## Configuration
 
 ### Plugin-Specific Configuration

docs/THRESHOLD_ALERTING.md

@@ -256,6 +256,56 @@ disk_monitor:
         operator: "<"
 ```
 
+### ZFS Monitor
+
+ZFS pool health is checked automatically for every pool. A pool in any state
+other than `ONLINE` (e.g. `DEGRADED`, `SUSPENDED`, `FAULTED`, `UNAVAIL`) raises
+a **CRITICAL** alert by default — no configuration required.
+
+The default threshold is equivalent to:
+
+```yaml
+zfs_monitor:
+  pools:
+    '*':
+      status:
+        warning: 1
+        critical: 2
+        operator: ">"
+        hysteresis: 0.0
+        display: "ZFS pool {pool_name} is {health}"
+```
+
+`'*'` matches every pool on the host. The notification message includes the pool
+name and its current health string, e.g. `ZFS pool tank is DEGRADED`.
+
+**Override for specific pools** — named pool entries take priority over `'*'`:
+
+```yaml
+zfs_monitor:
+  pools:
+    # Suppress health alerts for a scratch pool (not mission-critical)
+    scratch:
+      status:
+        enabled: false
+
+    # Capacity threshold for a specific pool
+    tank:
+      capacity:
+        warning: 75.0
+        critical: 90.0
+        operator: ">"
+        hysteresis: 0.05
+```
+
+**Alert state paths** follow the pattern `zfs_monitor.<pool_name>.status`,
+so acknowledgements and silences target individual pools:
+
+```
+zfs_monitor.tank.status
+zfs_monitor.backup.status
+```
+
 ### Network Monitor
 
 ```yaml
@@ -814,42 +864,39 @@ Planned features:
 
 ## Multi-Threshold Configuration
 
-**New in version 2.0**: Support for multiple named threshold configurations with per-host mapping.
+Support for multiple named threshold configurations with per-host mapping and composable layering.
 
 ### Overview
 
 The multi-threshold feature allows you to:
-- Define multiple sets of threshold configurations
+- Define multiple named threshold configurations
-- Map different hosts to different threshold sets
+- Assign one or more configurations to each host
+- Compose configurations by layering — each named config's overrides are applied in order on top of the defaults
 - Use different sensitivity levels for different environments
-- Maintain a default configuration for unmapped hosts
 
 ### Configuration Structure
 
+Named configurations are defined under `threshold_configs`. Each host selects which ones to use via `threshold_config` in the `hosts` section (a string for a single config, or a list to layer multiple):
+
 ```yaml
-# Optional: Set the default configuration name (defaults to "default")
+# Optional: set the default configuration name (defaults to "default")
 default_threshold_config: "default"
 
-# Define multiple named threshold configurations
 threshold_configs:
-  # Configuration name 1
   default:
     thresholds:
-      # Standard threshold definitions
       cpu_monitor:
         cpu_percent:
           warning: 80.0
           critical: 90.0
-  
+
-  # Configuration name 2
   high_sensitivity:
     thresholds:
       cpu_monitor:
         cpu_percent:
           warning: 60.0
           critical: 75.0
-  
+
-  # Configuration name 3
   low_sensitivity:
     thresholds:
       cpu_monitor:
@@ -857,14 +904,77 @@ threshold_configs:
           warning: 90.0
           critical: 95.0
 
-# Map specific hosts to specific configurations
+hosts:
-host_threshold_mapping:
+  prod-web-01:
-  prod-web-01: high_sensitivity
+    threshold_config: high_sensitivity   # single config
-  prod-web-02: high_sensitivity
+
-  dev-server-01: low_sensitivity
+  dev-server-01:
-  # Unmapped hosts use default_threshold_config
+    threshold_config: low_sensitivity
+
+  # Hosts with no threshold_config use default_threshold_config
 ```
 
+### Composable Configurations (list form)
+
+`threshold_config` can be a list. Configs are applied **left to right**: the defaults are the base, then each named config's overrides are layered on top. Later entries in the list win on any metric they define.
+
+```yaml
+threshold_configs:
+  default:
+    thresholds:
+      cpu_monitor:
+        cpu_percent: {warning: 80, critical: 90}
+      memory_monitor:
+        memory_percent: {warning: 85, critical: 95}
+      disk_monitor:
+        partitions:
+          /:
+            percent: {warning: 80, critical: 90}
+
+  # Tighter CPU limits for busy servers
+  high_cpu_load:
+    thresholds:
+      cpu_monitor:
+        cpu_percent: {warning: 60, critical: 75}
+
+  # Tighter disk limits for data-heavy servers
+  busy_disk:
+    thresholds:
+      disk_monitor:
+        partitions:
+          /:
+            percent: {warning: 70, critical: 85}
+
+hosts:
+  # Gets default thresholds only
+  web-01:
+    threshold_config: default
+
+  # Gets tighter CPU limits, default memory and disk
+  build-server:
+    threshold_config: high_cpu_load
+
+  # Layers both: tighter CPU AND tighter disk, default memory
+  db-01:
+    threshold_config: [high_cpu_load, busy_disk]
+
+  # Three layers: busy_disk overrides high_cpu_load if they conflict
+  storage-01:
+    threshold_config: [default, high_cpu_load, busy_disk]
+```
+
+**How layering works:**
+
+Starting from the `default` thresholds:
+
+| Layer | Applied config | Effect |
+|-------|---------------|--------|
+| Base  | `default` | all default thresholds |
+| +1    | `high_cpu_load` | cpu_percent overridden to 60/75 |
+| +2    | `busy_disk` | disk percent overridden to 70/85; cpu_percent stays at 60/75 |
+
+Each named config only overrides the metrics it explicitly defines. Metrics not mentioned in a config inherit from the layers beneath.
+
 ### Use Cases
 
 #### 1. Environment-Based Thresholds
@@ -879,7 +989,7 @@ threshold_configs:
         cpu_percent:
           warning: 70.0   # Alert earlier in production
           critical: 85.0
-  
+
   development:
     thresholds:
       cpu_monitor:
@@ -887,11 +997,15 @@ threshold_configs:
           warning: 90.0   # More relaxed for dev
           critical: 98.0
 
-host_threshold_mapping:
+hosts:
-  prod-web-01: production
+  prod-web-01:
-  prod-web-02: production
+    threshold_config: production
-  dev-web-01: development
+  prod-web-02:
-  dev-web-02: development
+    threshold_config: production
+  dev-web-01:
+    threshold_config: development
+  dev-web-02:
+    threshold_config: development
 ```
 
 #### 2. Server Role-Based Thresholds
@@ -906,7 +1020,7 @@ threshold_configs:
         cpu_percent:
           warning: 80.0
           critical: 90.0
-  
+
   database:
     thresholds:
       cpu_monitor:
@@ -914,7 +1028,7 @@ threshold_configs:
           warning: 70.0
           critical: 85.0
       memory_monitor:
-        percent:
+        memory_percent:
           warning: 90.0   # Databases can use high memory
           critical: 97.0
       disk_monitor:
@@ -923,21 +1037,27 @@ threshold_configs:
             percent:
               warning: 75.0
               critical: 85.0
-  
+
   cache:
     thresholds:
       memory_monitor:
-        percent:
+        memory_percent:
           warning: 95.0   # Redis/Memcached can use very high memory
           critical: 99.0
 
-host_threshold_mapping:
+hosts:
-  web-01: webserver
+  web-01:
-  web-02: webserver
+    threshold_config: webserver
-  db-01: database
+  web-02:
-  db-02: database
+    threshold_config: webserver
-  redis-01: cache
+  db-01:
-  memcached-01: cache
+    threshold_config: database
+  db-02:
+    threshold_config: database
+  redis-01:
+    threshold_config: cache
+  memcached-01:
+    threshold_config: cache
 ```
 
 #### 3. Sensitivity Levels
@@ -952,10 +1072,10 @@ threshold_configs:
         partitions:
           /:
             percent:
-              warning: 70.0    # Very sensitive
+              warning: 70.0
               critical: 80.0
               hysteresis: 0.15
-  
+
   standard:
     thresholds:
       disk_monitor:
@@ -965,7 +1085,7 @@ threshold_configs:
               warning: 85.0
               critical: 95.0
               hysteresis: 0.1
-  
+
   relaxed:
     thresholds:
       disk_monitor:
@@ -976,52 +1096,91 @@ threshold_configs:
               critical: 98.0
               hysteresis: 0.05
 
-host_threshold_mapping:
+hosts:
-  payment-gateway: critical
+  payment-gateway:
-  auth-server: critical
+    threshold_config: critical
-  web-01: standard
+  auth-server:
-  web-02: standard
+    threshold_config: critical
-  test-server: relaxed
+  web-01:
+    threshold_config: standard
+  web-02:
+    threshold_config: standard
+  test-server:
+    threshold_config: relaxed
 ```
 
-### Backward Compatibility
+#### 4. Composable Profiles
 
-The legacy single threshold configuration is fully supported:
+Build host-specific thresholds by combining small, focused configs:
 
 ```yaml
-# Old format - still works
-thresholds:
-  cpu_monitor:
-    cpu_percent:
-      warning: 80.0
-      critical: 90.0
-```
-
-This is equivalent to:
-
-```yaml
-# New format
 threshold_configs:
+  # Baseline — everything at default levels
   default:
     thresholds:
       cpu_monitor:
-        cpu_percent:
+        cpu_percent: {warning: 80, critical: 90}
-          warning: 80.0
+      memory_monitor:
-          critical: 90.0
+        memory_percent: {warning: 85, critical: 95}
-```
 
+  # Overlay: tighter CPU only
+  tight_cpu:
+    thresholds:
+      cpu_monitor:
+        cpu_percent: {warning: 60, critical: 75}
+
+  # Overlay: tighter memory only
+  tight_memory:
+    thresholds:
+      memory_monitor:
+        memory_percent: {warning: 70, critical: 85}
+
+  # Overlay: extra disk partition for database servers
+  db_disk:
+    thresholds:
+      disk_monitor:
+        partitions:
+          /var/lib/postgresql:
+            percent: {warning: 75, critical: 88}
+
+hosts:
+  # Plain web server
+  web-01:
+    threshold_config: default
+
+  # Build server: tight CPU, default memory and disk
+  build-01:
+    threshold_config: tight_cpu
+
+  # Database: tight CPU + tight memory + extra disk partition
+  db-01:
+    threshold_config: [tight_cpu, tight_memory, db_disk]
+
+  # Replica database: tight memory + extra disk, normal CPU
+  db-02:
+    threshold_config: [tight_memory, db_disk]
+```
 ### Configuration Priority
 
-1. **Host-specific mapping**: If host is in `host_threshold_mapping`, use that config
+1. **Host `threshold_config` (list)**: Layer each named config's overrides left-to-right on top of the defaults
-2. **Default config**: Use `default_threshold_config` 
+2. **Host `threshold_config` (string)**: Use that single named config directly
-3. **First alphabetically**: If default not found, use first config alphabetically
+3. **`host_threshold_mapping`** (legacy): Same as above, string only
-4. **Legacy fallback**: If `threshold_configs` not present, use `thresholds`
+4. **`default_threshold_config`**: Used for hosts with no mapping
+5. **First alphabetically**: If the default config is not found, use the first config alphabetically
+6. **Legacy `thresholds` section**: Used when `threshold_configs` is absent entirely
 
-### Example: Complete Multi-Threshold Setup
+### Backward Compatibility
 
-See `hbd/config_multi_threshold_example.yaml` for a complete example with:
+The legacy `host_threshold_mapping` top-level key and the flat `thresholds` section are still fully supported:
-- 4 named configurations (default, high_sensitivity, low_sensitivity, database)
+
-- Host-to-config mappings for production, development, and test systems
+```yaml
-- Specialized database server thresholds
+# Still works — equivalent to hosts: {prod-web-01: {threshold_config: high_sensitivity}}
-- Custom display messages with plugin data
+host_threshold_mapping:
+  prod-web-01: high_sensitivity
+
+# Still works — equivalent to threshold_configs: {default: {thresholds: ...}}
+thresholds:
+  cpu_monitor:
+    cpu_percent: {warning: 80, critical: 90}
+```
 

docs/USERS.md

@@ -0,0 +1,286 @@
+# User Management
+
+Heartbeat supports optional user accounts with role-based access control per host. When no users are configured the server runs in **unauthenticated mode** — all existing behaviour is unchanged.
+
+---
+
+## Overview
+
+Users are defined in the server config file. Each host can have an **owner**, zero or more **managers**, and zero or more **monitors**. A **default owner** catches any host that does not name an explicit owner.
+
+### Roles
+
+| Role | Inherits | Permissions |
+|------|----------|-------------|
+| **monitor** | — | View host status, plugin data, alerts; acknowledge alerts they were notified for |
+| **manager** | monitor | + Queue commands (`/c`), trigger DNS re-registration (`/n`), queue upgrades (`/u`); add/remove monitors |
+| **owner** | manager | + Drop host (`/d`); add/remove managers; transfer ownership; update host access |
+| **admin** *(flag)* | owner on all hosts | Full access to every host and the user list |
+
+`admin` is a flag on the user, not a per-host role. An admin user has owner-level access on every host without being listed as owner/manager/monitor.
+
+---
+
+## Configuration
+
+### Defining users
+
+```yaml
+users:
+  andreas:
+    full_name: Andreas Wrede
+    avatar: /path/to/avatar.png   # file path, URL, or base64 data URI (optional)
+    password: pbkdf2:sha256:...   # generated with: hbd passwd andreas
+    admin: true                   # optional — grants server-wide owner access
+
+  bob:
+    full_name: Bob Smith
+    password: pbkdf2:sha256:...
+    notification_channels: [pushover_standard]   # channels bob has selected
+
+  carol:
+    full_name: Carol Jones
+    password: pbkdf2:sha256:...
+
+default_owner: andreas            # owns hosts with no explicit owner
+                                  # falls back to the first admin user if omitted
+```
+
+### Client-declared host ownership
+
+A host can declare its own owner directly in the hbc or hbc_mini client configuration. This is useful for hosts that are not listed in the server config, or during initial setup before a server-side config entry has been created.
+
+**`~/.hbc.yaml`** (hbc):
+```yaml
+owner: andreas
+```
+
+**`~/.hbc.json`** (hbc_mini):
+```json
+{ "owner": "andreas" }
+```
+
+When set, the value is included in the `os_info` plugin data sent to the server. The server applies it as `host.owner` the first time `os_info` arrives, provided no owner has been configured server-side for that host. Server-configured ownership always takes precedence.
+
+---
+
+### Assigning roles to hosts
+
+```yaml
+hosts:
+  webserver01:
+    owner: andreas
+    managers: [bob]
+    monitors: [carol]
+    threshold_config: default
+    watch: true
+    notification_channels: [pushover_standard]
+
+  unattended-host:              # no owner → owned by default_owner
+    threshold_config: default
+    watch: true
+```
+
+### Generating a password hash
+
+```bash
+hbd passwd andreas
+```
+
+Enter and confirm the password when prompted. Paste the printed hash into the config file under the user's `password` key.
+
+You can also generate a hash non-interactively from Python:
+
+```python
+from hbd.server.users import hash_password
+print(hash_password("mysecret"))
+```
+
+Passwords are stored as PBKDF2-HMAC-SHA256 hashes (260 000 iterations). No third-party libraries are required — only Python's standard `hashlib`.
+
+---
+
+## Authentication
+
+When at least one user is defined, every request must be authenticated. Unauthenticated requests to HTML pages are redirected to `/login`; unauthenticated API requests receive `401 Unauthorized`.
+
+### Browser login
+
+Navigate to any page — you will be redirected to `/login` automatically. After submitting valid credentials the server sets an `hbd_session` cookie (HttpOnly, SameSite=Lax, 24 h lifetime). All subsequent requests, including JavaScript `fetch()` calls on the dashboards, carry the cookie automatically.
+
+To log out, visit `/logout`.
+
+### API / programmatic login
+
+```bash
+# Log in and capture the token
+TOKEN=$(curl -s -X POST http://localhost:50004/api/0/auth/login \
+  -H 'Content-Type: application/json' \
+  -d '{"username":"andreas","password":"mysecret"}' | jq -r .token)
+
+# Use the token in subsequent requests
+curl -H "Authorization: Bearer $TOKEN" http://localhost:50004/api/0/hosts
+```
+
+The token is identical to the session cookie value — both mechanisms work simultaneously.
+
+```bash
+# Log out
+curl -s -X POST http://localhost:50004/api/0/auth/logout \
+  -H "Authorization: Bearer $TOKEN"
+```
+
+---
+
+## API Endpoints
+
+### Authentication
+
+#### POST /api/0/auth/login
+Obtain a session token.
+
+**Request body:**
+```json
+{ "username": "andreas", "password": "mysecret" }
+```
+
+**Response:**
+```json
+{ "token": "<opaque-hex-token>", "username": "andreas" }
+```
+Also sets the `hbd_session` cookie for browser clients.
+
+**Status codes:** `200 OK`, `401 Unauthorized`, `404` (auth not configured)
+
+---
+
+#### POST /api/0/auth/logout
+Invalidate the current session.
+
+**Headers:** `Authorization: Bearer <token>` or cookie
+
+**Response:** `{ "success": true }`
+
+---
+
+### Users
+
+#### GET /api/0/users
+List all users. **Admin only.**
+
+**Response:**
+```json
+[
+  { "username": "andreas", "full_name": "Andreas Wrede", "avatar": "", "admin": true, "notification_channels": [] },
+  { "username": "bob",     "full_name": "Bob Smith",     "avatar": "", "admin": false, "notification_channels": ["pushover_standard"] }
+]
+```
+
+---
+
+#### GET /api/0/users/me
+Return the currently authenticated user's profile.
+
+**Response:**
+```json
+{ "username": "carol", "full_name": "Carol Jones", "avatar": "", "admin": false, "notification_channels": [] }
+```
+
+---
+
+#### PUT /api/0/users/me
+Update the current user's profile. All fields are optional — send only what you want to change.
+
+**Update display name and avatar:**
+```json
+{ "full_name": "Carol Jones", "avatar": "/avatars/carol.png" }
+```
+
+**Change notification channel selection:**
+```json
+{ "notification_channels": ["pushover_ops", "email_ops"] }
+```
+Only channels visible to the user (public + own private) are accepted; others are silently dropped.
+
+**Change password:**
+```json
+{ "password": { "current": "oldpass", "new": "newpass" } }
+```
+Requires the correct current password. New password is hashed before storage.
+
+**Response:** `{"ok": true}`
+
+**Status codes:** `200 OK`, `400` (missing/invalid field), `401` (unauthenticated), `403` (wrong current password)
+
+---
+
+### Host Access
+
+#### GET /api/0/hosts/{hostname}/access
+Return owner/managers/monitors for a host. Requires at least **monitor** role.
+
+**Response:**
+```json
+{
+  "owner": "andreas",
+  "managers": ["bob"],
+  "monitors": ["carol"]
+}
+```
+
+---
+
+#### PUT /api/0/hosts/{hostname}/access
+Update owner/managers/monitors. Requires **owner** role or admin.
+
+**Request body** (all fields optional):
+```json
+{
+  "owner": "bob",
+  "managers": ["carol"],
+  "monitors": []
+}
+```
+
+Changes take effect immediately in memory. They are not written back to the config file — reload (`SIGHUP`) will re-apply config values. To make changes permanent, update the config file.
+
+---
+
+## Host visibility
+
+When users are configured, `GET /api/0/hosts` only returns hosts the authenticated user has at least monitor access to. Admins see all hosts.
+
+---
+
+## Config reload
+
+On `SIGHUP`, the server reloads the config file, re-loads the user registry, and re-applies `owner`/`managers`/`monitors` from config to all known hosts. Existing sessions remain valid after a reload.
+
+---
+
+## No-auth mode
+
+If `users:` is absent or empty, the server starts in **unauthenticated mode**:
+
+- No login required — all pages and API endpoints are accessible without credentials.
+- All permission checks pass unconditionally.
+- `/login`, `/logout`, and the auth/user API endpoints return `404`.
+
+This preserves full backwards compatibility with existing deployments.
+
+---
+
+## Security notes
+
+- Session tokens are 64-character cryptographically random hex strings (`secrets.token_hex(32)`).
+- Sessions expire after 24 hours (configurable via `users_mod.SESSION_TTL`).
+- Cookies are `HttpOnly` and `SameSite=Lax` — they are not accessible to JavaScript and are not sent on cross-site requests.
+- The HTTP API does not yet enforce TLS. For production use, place hbd behind a TLS-terminating reverse proxy (nginx, Caddy, etc.) or enable WSS.
+
+---
+
+## See Also
+
+- [HTTP API Documentation](HTTP_API.md)
+- [Notifications](NOTIFICATIONS.md)
+- Configuration example: `hbd/config_example.yaml`

hbd/Plan.md

@@ -1,9 +0,0 @@
-Plan
-
-Heartbeat is a client/server based network monitor and host observer.  hbd, the server portion receives heartbeat and state messages from clients and maintaines state and hisgtory of the informations it receives.
-
-hbc, the client portion gathers information on various aspects of the
-system it is running on, and sends it to hbd. Initially this info is basic, like OS make and version, hardware info (CPU type, memory and disks), fileystem info and some resource info. hbc/hbd support a plugin system to extend the info gathered and stored.
-
-hbd also can send notification based on missed hbc updates, and on violation of pre-set limits for various state paramaters.
-

hbd/__init__.py

@@ -14,4 +14,4 @@ Install options:
 """
 
 __all__ = ["__version__"]
-__version__ = "5.0.7"
+__version__ = "5.3.10"

hbd/client/__init__.py

@@ -1,3 +1,3 @@
 """HeartBeat Client (hbc) - System monitoring client."""
 
-__version__ = "5.0.5"
+from hbd import __version__

hbd/client/config.py

@@ -2,6 +2,9 @@
 
 import logging
 import os
+import logging
+
+logger = logging.getLogger(__name__)
 
 try:
     import yaml
@@ -12,12 +15,15 @@ CLIENT_DEFAULTS = {
     # Network settings
     "hb_port": 50003,          # Port where hbd servers listen
     "interval": 10,             # Heartbeat interval in seconds
-    
+
+    # Host identity
+    "owner": None,             # Optional username to set as this host's owner on the server
+
     # Runtime flags
     "foreground": False,
     "verbose": False,
     "debug": 0,
-    
+
     # Plugin configuration
     "plugins": {},              # Per-plugin configuration
     "thresholds": {},           # Threshold configuration for monitoring
@@ -30,18 +36,19 @@ def load_config(path=None):
     If YAML is not available or the file does not exist, defaults are returned.
     
     Args:
-        path: Path to YAML config file (default: ~/.hb.yaml)
+        path: Path to YAML config file (default: ~/.hbc.yaml)
         
     Returns:
         Dictionary with configuration
     """
     cfg = CLIENT_DEFAULTS.copy()
     if not path:
-        # default path (~/.hb.yaml)
+        # default path (~/.hbc.yaml)
-        path = os.path.join(os.path.expanduser("~"), ".hb.yaml")
+        path = os.path.join(os.path.expanduser("~"), ".hbc.yaml")
 
     if os.path.exists(path):
         if yaml:
+            logger.info("Loading configuration from %s", path)
             with open(path) as fh:
                 data = yaml.safe_load(fh)
             # Merge YAML data with defaults
@@ -50,5 +57,5 @@ def load_config(path=None):
                 cfg[k] = v
         else:
             # yaml not installed: do not attempt to parse; user must ensure defaults
-            pass
+            logger.warning("PyYAML not available - cannot load config from %s, using defaults", path)
     return cfg

hbd/client/main.py

@@ -14,13 +14,14 @@ import signal
 import socket
 import sys
 import time
-from hashlib import md5
+from logging.handlers import SysLogHandler
 from pathlib import Path
 from typing import Dict, List, Optional
 
 # Import protocol and config
 from .config import load_config
 from ..common.proto import dicttos, stodict
+from .. import __version__
 
 # Import plugin system
 from .plugin import PluginRegistry, PluginLoader, InfoPlugin, MonitorPlugin
@@ -55,23 +56,28 @@ class AsyncConnection:
         
         self.transport: Optional[asyncio.DatagramTransport] = None
         self.protocol: Optional[asyncio.DatagramProtocol] = None
-        
+        self._dead = False
+        self._ever_opened = False
+        self._open_fail_count = 0   # consecutive failures before first success
+        self.request_info_event: asyncio.Event = asyncio.Event()
+
         self.logger = logging.getLogger(f"hbc.conn.{addr}")
-    
+
     async def open(self) -> bool:
         """Open the UDP connection.
-        
+
         Returns:
             True if successful, False otherwise
         """
         try:
             loop = asyncio.get_event_loop()
-            
+
             # Create datagram endpoint
             self.transport, self.protocol = await loop.create_datagram_endpoint(
                 lambda: HeartbeatProtocol(self),
                 family=self.af
             )
+            self._ever_opened = True
             self.logger.debug(f"Opened connection to {self.addr}:{self.port}")
             return True
         except Exception as e:
@@ -92,9 +98,12 @@ class AsyncConnection:
             msg: Message dictionary
             msg_id: Message ID (HTB, PLG, etc.)
         """
+        if self._dead:
+            return
+
         if not self.transport:
             await self.open()
-        
+
         if not self.transport:
             self.logger.error("Cannot send - no transport")
             return
@@ -130,6 +139,9 @@ class AsyncConnection:
         
         self.ackcount += 1
         self.logger.debug(f"ACK received, RTT: {rtt:.1f}ms")
+        if msg.get("request_update"):
+            self.logger.info("server requested plugin info refresh")
+            self.request_info_event.set()
 
 
 class HeartbeatProtocol(asyncio.DatagramProtocol):
@@ -165,8 +177,9 @@ class HeartbeatProtocol(asyncio.DatagramProtocol):
             self.logger.error(f"Error processing datagram: {e}", exc_info=True)
     
     def error_received(self, exc):
-        """Handle protocol errors."""
+        """Handle protocol errors — close transport so the heartbeat sender retries."""
-        self.logger.error(f"Protocol error: {exc}")
+        self.logger.warning(f"Protocol error on {self.connection.addr}: {exc} — will retry")
+        self.connection.close()
 
 
 async def handle_command(conn: AsyncConnection, msg: dict):
@@ -203,55 +216,52 @@ async def handle_command(conn: AsyncConnection, msg: dict):
     await conn.sendto(response)
 
 
-async def handle_update(conn: AsyncConnection, msg: dict):
+async def handle_update(conn: AsyncConnection, _msg: dict):  # pyright: ignore[reportUnusedParameter]
-    """Handle self-update from server."""
+    """Handle self-update by running hb_install.sh."""
-    import codecs
     import shutil
-    
+
     logger = logging.getLogger("hbc.update")
-    
+
+    installer = shutil.which("hb_install.sh")
+    if installer is None:
+        candidate = Path(sys.argv[0]).parent / "hb_install.sh"
+        if candidate.exists():
+            installer = str(candidate)
+
+    if installer is None:
+        error = "hb_install.sh not found in PATH or alongside hbc"
+        logger.error(error)
+        await conn.sendto({"service": "update", "msg": error})
+        return
+
+    logger.info(f"Running installer: {installer}")
     try:
-        code = codecs.decode(msg["code"], "base64").decode()
+        proc = await asyncio.create_subprocess_exec(
-        csum = msg["csum"]
+            installer, "client",
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.STDOUT,
+        )
+        out, _ = await asyncio.wait_for(proc.communicate(), timeout=120)
+    except asyncio.TimeoutError:
+        error = "Installer timed out"
+        logger.error(error)
+        await conn.sendto({"service": "update", "msg": error})
+        return
     except Exception as e:
-        error = f"Missing code/csum: {e}"
+        error = f"Installer failed: {e}"
         logger.error(error)
         await conn.sendto({"service": "update", "msg": error})
         return
-    
+
-    # Verify checksum
+    if proc.returncode != 0:
-    m = md5()
+        error = f"Installer exited {proc.returncode}: {out.decode().strip()}"
-    m.update(code.encode())
-    if m.hexdigest() != csum:
-        error = "Checksum mismatch"
         logger.error(error)
         await conn.sendto({"service": "update", "msg": error})
         return
-    
+
-    # Backup current file
-    fn = sys.argv[0]
-    ofn = f"{fn}.sav"
-    try:
-        shutil.copy2(fn, ofn)
-    except Exception as e:
-        error = f"Backup failed: {e}"
-        logger.error(error)
-        await conn.sendto({"service": "update", "msg": error})
-        return
-    
-    # Write new code
-    try:
-        with open(fn, "w") as fh:
-            fh.write(code)
-    except Exception as e:
-        error = f"Write failed: {e}"
-        logger.error(error)
-        await conn.sendto({"service": "update", "msg": error})
-        return
-    
     logger.info("Update successful, restart required")
     await conn.sendto({"service": "update", "msg": "OK"})
-    
+
     # Trigger restart
     global dorestart
     dorestart = True
@@ -259,15 +269,51 @@ async def handle_update(conn: AsyncConnection, msg: dict):
 
 
 async def heartbeat_sender(conn: AsyncConnection, interval: int):
-    """Send periodic heartbeats.
+    """Send periodic heartbeats, retrying the connection if it is not open.
-    
+
+    IPv6 connections that fail to open before their first successful send are
+    dropped after IPV6_EARLY_FAIL_LIMIT attempts so that a network without IPv6
+    does not keep a dead sender alive.  IPv4 connections are retried indefinitely.
+
     Args:
         conn: Connection to send on
         interval: Heartbeat interval in seconds
     """
     logger = logging.getLogger("hbc.heartbeat")
-    
+    IPV6_EARLY_FAIL_LIMIT = 3
-    while running:
+
+    while running and not conn._dead:
+        # Ensure transport is open before attempting to send.
+        if not conn.transport:
+            opened = await conn.open()
+            if opened:
+                conn._open_fail_count = 0
+            else:
+                conn._open_fail_count += 1
+                # Drop an IPv6 connection that has never come up within the
+                # first few attempts — it is likely unavailable on this network.
+                if (not conn._ever_opened
+                        and conn.af == socket.AF_INET6
+                        and conn._open_fail_count >= IPV6_EARLY_FAIL_LIMIT):
+                    logger.warning(
+                        f"IPv6 connection to {conn.addr} unreachable after "
+                        f"{conn._open_fail_count} attempts, disabling"
+                    )
+                    conn._dead = True
+                    break
+                # Retry after the normal interval; IPv4 retries forever.
+                try:
+                    if shutdown_event:
+                        await asyncio.wait_for(shutdown_event.wait(), timeout=interval)
+                        break
+                    else:
+                        await asyncio.sleep(interval)
+                except asyncio.TimeoutError:
+                    pass
+                except asyncio.CancelledError:
+                    raise
+                continue
+
         try:
             msg = {
                 "acks": conn.ackcount,
@@ -275,20 +321,17 @@ async def heartbeat_sender(conn: AsyncConnection, interval: int):
                 "interval": interval
             }
             await conn.sendto(msg, "HTB")
-            
+
-        except Exception as e:
-            logger.error(f"Error sending heartbeat: {e}", exc_info=True)
         except asyncio.CancelledError:
             logger.debug("Heartbeat sender cancelled")
             raise
-        
+        except Exception as e:
+            logger.error(f"Error sending heartbeat: {e}", exc_info=True)
+
         # Wait for next interval or shutdown event
         try:
             if shutdown_event:
-                await asyncio.wait_for(
+                await asyncio.wait_for(shutdown_event.wait(), timeout=interval)
-                    shutdown_event.wait(), 
-                    timeout=interval
-                )
                 break
             else:
                 await asyncio.sleep(interval)
@@ -299,15 +342,35 @@ async def heartbeat_sender(conn: AsyncConnection, interval: int):
             raise
 
 
+async def _info_plugin_refresh_loop(conn: AsyncConnection, info_plugins: List):
+    """Wait for server requests to re-send InfoPlugin data."""
+    logger = logging.getLogger("hbc.plugins")
+    while running:
+        await conn.request_info_event.wait()
+        if not running:
+            break
+        conn.request_info_event.clear()
+        logger.info("refreshing InfoPlugins on server request")
+        for plugin in info_plugins:
+            plugin._cache = None
+            try:
+                data = await plugin.collect()
+                if data:
+                    await conn.sendto({"plugin": plugin.name, **data}, "PLG")
+                    logger.info(f"Resent {plugin.name} data")
+            except Exception as e:
+                logger.error(f"Error re-collecting {plugin.name}: {e}", exc_info=True)
+
+
 async def plugin_collector(conn: AsyncConnection, registry: PluginRegistry):
     """Collect and send plugin data.
-    
+
     Args:
         conn: Connection to send on
         registry: Plugin registry
     """
     logger = logging.getLogger("hbc.plugins")
-    
+
     # Collect InfoPlugins once at startup
     info_plugins = registry.get_by_type(InfoPlugin)
     for plugin in info_plugins:
@@ -320,34 +383,31 @@ async def plugin_collector(conn: AsyncConnection, registry: PluginRegistry):
                 logger.info(f"Sent {plugin.name} data")
         except Exception as e:
             logger.error(f"Error collecting {plugin.name}: {e}", exc_info=True)
-    
+
     # Schedule MonitorPlugins
     # Group plugins by interval
     from collections import defaultdict
     by_interval = defaultdict(list)
-    
+
     monitor_plugins = registry.get_by_type(MonitorPlugin)
     for plugin in monitor_plugins:
         by_interval[plugin.interval].append(plugin)
-    
+
-    # Create tasks for each interval
+    # Create tasks for each interval; always include the info-refresh watcher
-    tasks = []
+    tasks = [asyncio.create_task(_info_plugin_refresh_loop(conn, info_plugins))]
     for interval, plugins in by_interval.items():
-        task = asyncio.create_task(
+        tasks.append(asyncio.create_task(
             plugin_collector_interval(conn, plugins, interval)
-        )
+        ))
-        tasks.append(task)
+
-    
+    try:
-    # Wait for all tasks
+        await asyncio.gather(*tasks, return_exceptions=True)
-    if tasks:
+    except asyncio.CancelledError:
-        try:
+        logger.debug("Plugin collector cancelled, cancelling sub-tasks")
-            await asyncio.gather(*tasks, return_exceptions=True)
+        for task in tasks:
-        except asyncio.CancelledError:
+            if not task.done():
-            logger.debug("Plugin collector cancelled, cancelling sub-tasks")
+                task.cancel()
-            for task in tasks:
+        raise
-                if not task.done():
-                    task.cancel()
-            raise
 
 
 async def plugin_collector_interval(
@@ -424,16 +484,13 @@ async def cleanup(connections: List[AsyncConnection]):
     logger = logging.getLogger("hbc.cleanup")
     logger.info("Cleaning up connections")
     
-    for conn in connections:
+    target = next((c for c in connections if c.transport), connections[0] if connections else None)
+    if target and send_shutdown:
         try:
-            msg = {
+            await target.sendto({"shutdown": 1, "acks": target.ackcount})
-                "shutdown": 1,
-                "acks": conn.ackcount
-            }
-            await conn.sendto(msg)
         except Exception as e:
             logger.error(f"Error sending shutdown: {e}")
-        
+    for conn in connections:
         conn.close()
     
     # Give messages time to send
@@ -442,7 +499,7 @@ async def cleanup(connections: List[AsyncConnection]):
 
 async def async_main(args, config):
     """Async main function."""
-    global running, shutdown_event, active_tasks
+    global running, shutdown_event, active_tasks, send_shutdown 
     
     # Create shutdown event
     shutdown_event = asyncio.Event()
@@ -459,47 +516,62 @@ async def async_main(args, config):
     hb_port = config.get("hb_port", PORT)
     interval = config.get("interval", INTERVAL)
     
-    logger.info(f"Starting hbc for {iam} -> {hb_hosts}")
+    logger.info(f"hbc {__version__} on {iam} -> {hb_hosts} port={hb_port}, interval={interval}s")
-    logger.info(f"Port: {hb_port}, Interval: {interval}s")
     
+    af_filter = (socket.AF_INET if getattr(args, "ipv4_only", False)
+                 else socket.AF_INET6 if getattr(args, "ipv6_only", False)
+                 else 0)
+
     # Create connections
     connections = []
     conn_id = 1
-    
+    _retry_delay = 5
-    for host in hb_hosts:
+
-        try:
+    while running and not connections:
-            addrs = socket.getaddrinfo(host, hb_port, 0, 0, socket.SOL_UDP)
+        for host in hb_hosts:
-        except socket.gaierror as e:
+            try:
-            logger.error(f"Cannot resolve {host}: {e}")
+                addrs = socket.getaddrinfo(host, hb_port, af_filter, 0, socket.SOL_UDP)
-            continue
+            except socket.gaierror as e:
-        
+                logger.warning(f"Cannot resolve {host}: {e} — retrying in {_retry_delay}s")
-        for addr_info in addrs:
+                continue
-            af = addr_info[0]
+            for addr_info in addrs:
-            addr = addr_info[4][0]
+                af = addr_info[0]
-            
+                addr = addr_info[4][0]
-            conn = AsyncConnection(conn_id, addr, hb_port, af, iam)
+                conn = AsyncConnection(conn_id, addr, hb_port, af, iam)
-            if await conn.open():
+                if not await conn.open():
+                    logger.warning(f"Initial open to {addr} failed, heartbeat sender will retry")
                 connections.append(conn)
                 conn_id += 1
-    
+        if not connections:
+            try:
+                if shutdown_event:
+                    await asyncio.wait_for(shutdown_event.wait(), timeout=_retry_delay)
+                else:
+                    await asyncio.sleep(_retry_delay)
+            except asyncio.TimeoutError:
+                pass
+            _retry_delay = min(_retry_delay * 2, 60)
+
     if not connections:
-        logger.error("No connections established")
         return 1
-    
+
     logger.info(f"Created {len(connections)} connections")
     
     # Send boot/message if requested
+    send_shutdown = False
     if args.boot or args.message:
         boot_msg = {}
         if args.boot:
             boot_msg["boot"] = 1
+            args.boot = False  # Clear boot flag so we don't send it again in main loop
+            send_shutdown = True
         if args.message:
             boot_msg["service"] = "service"
             boot_msg["msg"] = args.message
         
         boot_msg["acks"] = 0
-        for conn in connections:
+        target = next((c for c in connections if c.transport), connections[0])
-            await conn.sendto(boot_msg)
+        await target.sendto(boot_msg)
         
         if args.message and not args.daemon:
             # Message-only mode
@@ -521,6 +593,13 @@ async def async_main(args, config):
     loop = asyncio.get_event_loop()
     for sig in (signal.SIGTERM, signal.SIGINT):
         loop.add_signal_handler(sig, stop)
+
+    def _sighup():
+        global dorestart
+        dorestart = True
+        stop()
+
+    loop.add_signal_handler(signal.SIGHUP, _sighup)
     
     # Start async tasks
     # Heartbeat senders (one per connection)
@@ -586,6 +665,36 @@ def daemonize(
     os.dup2(se.fileno(), sys.stderr.fileno())
 
 
+def _reconfigure_logging_for_daemon(log_level: int) -> None:
+    """Replace StreamHandlers (now writing to /dev/null) with a SysLogHandler."""
+    root = logging.getLogger()
+    for handler in root.handlers[:]:
+        root.removeHandler(handler)
+        handler.close()
+
+    use_udp_fallback = not os.path.exists("/dev/log")
+
+    if use_udp_fallback:
+        syslog_handler = SysLogHandler(
+            address=("localhost", 514),
+            facility=SysLogHandler.LOG_DAEMON,
+        )
+    else:
+        syslog_handler = SysLogHandler(
+            address="/dev/log",
+            facility=SysLogHandler.LOG_DAEMON,
+        )
+
+    syslog_handler.setFormatter(
+        logging.Formatter("hbc[%(process)d]: %(name)s %(levelname)s: %(message)s")
+    )
+    root.addHandler(syslog_handler)
+    root.setLevel(log_level)
+
+    if use_udp_fallback:
+        logging.warning("/dev/log not found, using syslog UDP localhost:514")
+
+
 def build_parser():
     """Build argument parser."""
     parser = argparse.ArgumentParser(
@@ -629,6 +738,9 @@ def build_parser():
         default=0,
         help="Increase debug level"
     )
+    af_group = parser.add_mutually_exclusive_group()
+    af_group.add_argument("-4", dest="ipv4_only", action="store_true", help="Use IPv4 only")
+    af_group.add_argument("-6", dest="ipv6_only", action="store_true", help="Use IPv6 only")
     parser.add_argument(
         "hosts",
         nargs="+",
@@ -644,13 +756,10 @@ def main(argv=None):
     parser = build_parser()
     args = parser.parse_args(argv)
     
-    # Load config
-    config = load_config(args.configfile)
-    
     # Setup logging
-    log_level = logging.INFO
+    log_level = logging.WARNING
     if args.verbose:
-        log_level = logging.DEBUG
+        log_level = logging.INFO
     if args.debug:
         log_level = logging.DEBUG
     
@@ -659,20 +768,16 @@ def main(argv=None):
         format="%(asctime)s %(name)s %(levelname)s: %(message)s",
         datefmt="%Y-%m-%d %H:%M:%S"
     )
+
+    # Load config
+    config = load_config(args.configfile)
     
     # Daemonize if requested
     if args.daemon:
-        print("Daemonizing...")
+        logging.info("Daemonizing...")
-        import syslog
-        syslog.openlog("hbc", syslog.LOG_PID, syslog.LOG_DAEMON)
-        syslog.syslog(syslog.LOG_INFO, f"Starting heartbeat to {', '.join(args.hosts)}")
         daemonize()
-        
+        _reconfigure_logging_for_daemon(log_level)
-        # Reconfigure logging for syslog
+        logging.info(f"hbc starting, sending heartbeat to {', '.join(args.hosts)}")
-        logging.basicConfig(
-            level=log_level,
-            format="hbc[%(process)d]: %(name)s %(levelname)s: %(message)s"
-        )
     
     # Run async main
     try:

hbd/client/plugin.py

@@ -22,13 +22,14 @@ from typing import Any, Dict, List, Optional, Type
 
 class Plugin(ABC):
     """Base class for all plugins.
-    
+
     Attributes:
         name: Unique plugin identifier (e.g., "os_info", "cpu_monitor")
         version: Plugin version string
         description: Human-readable description
         interval: Collection interval in seconds (0 for InfoPlugin = collect once)
         enabled: Whether plugin is active (can be disabled via config)
+        skip_reason: Set by plugin before returning False from initialize(); causes loader to log INFO instead of WARNING.
     """
     
     name: str = ""
@@ -39,13 +40,14 @@ class Plugin(ABC):
     
     def __init__(self, config: Optional[Dict[str, Any]] = None):
         """Initialize plugin with optional configuration.
-        
+
         Args:
             config: Plugin-specific configuration from YAML (e.g., thresholds, paths)
         """
         self.config = config or {}
         self.logger = logging.getLogger(f"plugin.{self.name}")
         self._initialized = False
+        self.skip_reason: Optional[str] = None
         
     @abstractmethod
     async def initialize(self) -> bool:
@@ -311,7 +313,11 @@ class PluginLoader:
             return 0
         
         loaded_count = 0
-        plugin_config = config or {}
+        raw_config = config or {}
+        # Per-plugin config lives under the 'plugins' key or at top-level.
+        # CLIENT_DEFAULTS seeds "plugins": {} so the key always exists; check
+        # both the subdict and top-level so that either layout in .hbc.yaml works.
+        plugins_subconfig = raw_config.get("plugins", {})
         
         # Scan for Python files
         for plugin_file in directory.glob("*.py"):
@@ -356,17 +362,26 @@ class PluginLoader:
                     
                     self.logger.debug(f"Found plugin class: {name}")
                     
-                    # Instantiate plugin with config
+                    # Instantiate plugin with config — check plugins subdict first,
-                    plugin_instance_config = plugin_config.get(obj.name, {})
+                    # then top-level keys (e.g. nagios_runner: ... at root of config).
+                    plugin_instance_config = dict(plugins_subconfig.get(obj.name) or raw_config.get(obj.name) or {})
+                    # Propagate top-level owner so os_info (and any future plugin) can report it.
+                    if "owner" in raw_config and "owner" not in plugin_instance_config:
+                        plugin_instance_config["owner"] = raw_config["owner"]
                     plugin = obj(config=plugin_instance_config)
                     
                     # Initialize plugin
                     try:
                         initialized = await plugin.initialize()
                         if not initialized:
-                            self.logger.warning(
+                            if plugin.skip_reason:
-                                f"Plugin {plugin.name} failed initialization, skipping"
+                                self.logger.info(
-                            )
+                                    f"Plugin {plugin.name} skipped: {plugin.skip_reason}"
+                                )
+                            else:
+                                self.logger.warning(
+                                    f"Plugin {plugin.name} failed initialization, skipping"
+                                )
                             continue
                     except Exception as e:
                         self.logger.error(

hbd/client/plugins/cpu_monitor.py

@@ -118,6 +118,13 @@ class CPUMonitorPlugin(MonitorPlugin):
                     data["cpu_iowait"] = round(cpu_times.iowait, 1)
             except Exception as e:
                 self.logger.debug(f"Could not get CPU times: {e}")
+
+            # Uptime in seconds
+            try:
+                import time
+                data["uptime_seconds"] = int(time.time() - self.psutil.boot_time())
+            except Exception as e:
+                self.logger.debug(f"Could not get uptime: {e}")
             
             self.logger.debug(
                 f"Collected CPU metrics: {data.get('cpu_percent', 'N/A')}% usage"

hbd/client/plugins/filesystem_info.py

@@ -127,15 +127,15 @@ class FilesystemInfoPlugin(InfoPlugin):
                     try:
                         # Maximum filename length
                         max_name = os.pathconf(partition.mountpoint, 'PC_NAME_MAX')
-                        if max_name:
+                        if max_name is not None:
                             fs_info['maxfile'] = max_name
                     except (OSError, ValueError):
                         pass
-                    
+
                     try:
                         # Maximum path length
                         max_path = os.pathconf(partition.mountpoint, 'PC_PATH_MAX')
-                        if max_path:
+                        if max_path is not None:
                             fs_info['maxpath'] = max_path
                     except (OSError, ValueError):
                         pass

hbd/client/plugins/memory_monitor.py

@@ -14,6 +14,24 @@ except ImportError:
 
 from hbd.client.plugin import MonitorPlugin
 
+
+def _zfs_arc_bytes() -> int:
+    """Return current ZFS ARC size in bytes, or 0 if ZFS is not present.
+
+    ZFS ARC is reclaimable but is not included in MemAvailable by the Linux
+    kernel (it is not in SReclaimable), so it would otherwise be counted as
+    used memory.
+    """
+    try:
+        with open("/proc/spl/kstat/zfs/arcstats") as fh:
+            for line in fh:
+                parts = line.split()
+                if len(parts) >= 3 and parts[0] == "size":
+                    return int(parts[2])
+    except (OSError, ValueError):
+        pass
+    return 0
+
 logger = logging.getLogger(__name__)
 
 
@@ -101,11 +119,21 @@ class MemoryMonitorPlugin(MonitorPlugin):
         
         # Virtual (physical) memory statistics
         vmem = psutil.virtual_memory()
+
+        # psutil's available already excludes page cache / file buffers
+        # (uses MemAvailable on Linux). Add ZFS ARC on top because the kernel
+        # does not include it in SReclaimable / MemAvailable even though it is
+        # reclaimable.
+        arc_bytes = _zfs_arc_bytes()
+        available = min(vmem.available + arc_bytes, vmem.total)
+        used = vmem.total - available
+        percent = round(used / vmem.total * 100, 1) if vmem.total else 0.0
+
         metrics['memory_total'] = vmem.total
-        metrics['memory_available'] = vmem.available
+        metrics['memory_available'] = available
-        metrics['memory_used'] = vmem.used
+        metrics['memory_used'] = used
         metrics['memory_free'] = vmem.free
-        metrics['memory_percent'] = vmem.percent
+        metrics['memory_percent'] = percent
         
         # Platform-specific memory details
         if hasattr(vmem, 'active'):

hbd/client/plugins/nagios_runner.py

@@ -21,24 +21,23 @@ nagios_runner:
 ```
 """
 
+import asyncio
+import os
 import re
-import subprocess
+import shlex
 from typing import Any, Dict, List, Optional, Tuple
 
 from hbd.client.plugin import MonitorPlugin
 
 
 # Nagios exit codes
-NAGIOS_OK = 0
-NAGIOS_WARNING = 1
-NAGIOS_CRITICAL = 2
 NAGIOS_UNKNOWN = 3
 
 STATUS_NAMES = {
-    NAGIOS_OK: "OK",
+    0: "OK",
-    NAGIOS_WARNING: "WARNING",
+    1: "WARNING",
-    NAGIOS_CRITICAL: "CRITICAL",
+    2: "CRITICAL",
-    NAGIOS_UNKNOWN: "UNKNOWN"
+    3: "UNKNOWN",
 }
 
 
@@ -52,8 +51,7 @@ class NagiosRunnerPlugin(MonitorPlugin):
         interval: Collection interval in seconds (default: 300)
         commands: List of command definitions with 'name' and 'command' keys
         timeout: Command execution timeout in seconds (default: 30)
-        shell: Whether to execute commands via shell (default: True)
+
-    
     Example:
         nagios_runner:
           interval: 300  # Check every 5 minutes
@@ -76,32 +74,48 @@ class NagiosRunnerPlugin(MonitorPlugin):
         # Extract configuration
         self.commands: List[Dict[str, str]] = config.get("commands", []) if config else []
         self.timeout: int = config.get("timeout", 30) if config else 30
-        self.shell: bool = config.get("shell", True) if config else True
         self.interval = config.get("interval", 300) if config else 300
-        
-        # Validate commands
-        if not self.commands:
-            self.logger.warning(
-                "No Nagios commands configured. Add 'nagios_runner.commands' to config."
-            )
     
     async def initialize(self) -> bool:
         """Initialize the Nagios runner plugin.
-        
+
         Returns:
             True if at least one command is configured, False otherwise
         """
         self.logger.info(f"Initializing {self.name} plugin")
-        
+
         if not self.commands:
-            self.logger.error("No Nagios commands configured")
+            self.skip_reason = "no commands configured (add nagios_runner.commands to config)"
             return False
-        
+
         self.logger.info(f"Configured to run {len(self.commands)} Nagios plugin(s)")
         for cmd_config in self.commands:
             name = cmd_config.get("name", "unnamed")
             self.logger.info(f"  - {name}: {cmd_config.get('command', 'N/A')}")
-        
+
+        # Validate absolute command paths early
+        for cmd_config in self.commands:
+            name = cmd_config.get("name", "unnamed")
+            command = cmd_config.get("command", "")
+            if not command:
+                continue
+            try:
+                tokens = shlex.split(command)
+            except ValueError:
+                continue  # malformed command string; skip validation
+            if not tokens:
+                continue
+            exe = tokens[0]
+            if os.path.isabs(exe):
+                if not os.path.isfile(exe):
+                    self.logger.warning(
+                        f"Command '{name}': executable not found: {exe}"
+                    )
+                elif not os.access(exe, os.X_OK):
+                    self.logger.warning(
+                        f"Command '{name}': executable not executable: {exe}"
+                    )
+
         return True
     
     async def _collect_metrics(self) -> Dict[str, Any]:
@@ -111,98 +125,88 @@ class NagiosRunnerPlugin(MonitorPlugin):
             Dictionary with results from all plugins
         """
         results = {}
-        
+
-        # Track overall status (worst status wins)
-        worst_status = NAGIOS_OK
-        
         for cmd_config in self.commands:
             name = cmd_config.get("name")
             command = cmd_config.get("command")
-            
+
             if not name or not command:
                 self.logger.warning("Skipping command with missing name or command")
                 continue
-            
+
             # Execute plugin
             try:
                 status_code, output, perfdata = await self._run_nagios_plugin(command)
-                
+
                 # Store results
                 results[f"{name}_status"] = STATUS_NAMES.get(status_code, "UNKNOWN")
                 results[f"{name}_status_code"] = status_code
                 results[f"{name}_output"] = output
-                
+
-                # Track worst status
-                if status_code > worst_status:
-                    worst_status = status_code
-                
                 # Parse and add performance data
                 if perfdata:
                     for metric_name, metric_value in perfdata.items():
                         results[f"{name}_{metric_name}"] = metric_value
-                
+
-                self.logger.debug(
+                self.logger.info(
                     f"Executed {name}: {STATUS_NAMES.get(status_code, 'UNKNOWN')} - {output[:50]}"
                 )
-                
+
             except Exception as e:
                 self.logger.error(f"Error running {name}: {e}", exc_info=True)
                 results[f"{name}_status"] = "ERROR"
                 results[f"{name}_status_code"] = NAGIOS_UNKNOWN
                 results[f"{name}_output"] = str(e)
-                worst_status = NAGIOS_UNKNOWN
+
-        
-        # Add overall status
-        results["overall_status"] = STATUS_NAMES.get(worst_status, "UNKNOWN")
-        results["overall_status_code"] = worst_status
-        results["plugin_count"] = len(self.commands)
-        
         return results
     
     async def _run_nagios_plugin(
         self,
         command: str
     ) -> Tuple[int, str, Dict[str, Any]]:
-        """Execute a Nagios plugin and parse its output.
+        """Execute a Nagios plugin and parse its output."""
-        
-        Args:
-            command: Command string to execute
-            
-        Returns:
-            Tuple of (status_code, output_message, performance_data_dict)
-        """
         try:
-            # Run command
+            proc = await asyncio.create_subprocess_shell(
-            result = subprocess.run(
                 command,
-                shell=self.shell,
+                stdout=asyncio.subprocess.PIPE,
-                capture_output=True,
+                stderr=asyncio.subprocess.PIPE,
-                timeout=self.timeout,
-                text=True
             )
-            
+            try:
-            status_code = result.returncode
+                stdout_bytes, stderr_bytes = await asyncio.wait_for(
-            output = result.stdout.strip()
+                    proc.communicate(), timeout=self.timeout
-            
+                )
-            # Nagios plugins can return codes > 3, treat as UNKNOWN
+            except asyncio.TimeoutError:
+                proc.kill()
+                await proc.communicate()
+                self.logger.error(f"Command timed out: {command}")
+                return NAGIOS_UNKNOWN, f"Command timed out after {self.timeout}s", {}
+
+            status_code = proc.returncode
+
+            if status_code < 0:
+                return NAGIOS_UNKNOWN, f"Process killed by signal {-status_code}", {}
+
             if status_code > 3:
                 status_code = NAGIOS_UNKNOWN
-            
+
-            # Parse performance data
+            stdout = stdout_bytes.decode(errors="replace").strip()
-            perfdata = self._parse_perfdata(output)
+            stderr = stderr_bytes.decode(errors="replace").strip()
-            
+
-            # Extract just the status message (before the pipe if present)
+            # Parse perfdata from stdout before mixing in stderr
-            if '|' in output:
+            perfdata = self._parse_perfdata(stdout)
-                output_msg = output.split('|')[0].strip()
+
+            # Build status message
+            status_part = stdout.split('|')[0].strip() if '|' in stdout else stdout
+
+            if not stdout and stderr:
+                output_msg = stderr
+            elif stdout and stderr:
+                output_msg = f"{status_part} [stderr: {stderr}]"
             else:
-                output_msg = output
+                output_msg = status_part
-            
+
             return status_code, output_msg, perfdata
-            
+
-        except subprocess.TimeoutExpired:
-            self.logger.error(f"Command timed out: {command}")
-            return NAGIOS_UNKNOWN, f"Command timed out after {self.timeout}s", {}
-        
         except Exception as e:
             self.logger.error(f"Error executing command: {e}")
             return NAGIOS_UNKNOWN, f"Execution error: {str(e)}", {}

hbd/client/plugins/os_info.py

@@ -48,6 +48,7 @@ class OSInfoPlugin(InfoPlugin):
             Dictionary with OS details
         """
         try:
+            from hbd import __version__ as hbc_version
             data = {
                 "system": platform.system(),  # e.g., "Linux", "Darwin", "Windows"
                 "node": platform.node(),  # hostname
@@ -58,7 +59,12 @@ class OSInfoPlugin(InfoPlugin):
                 "architecture": platform.architecture()[0],  # e.g., "64bit"
                 "python_version": platform.python_version(),
                 "python_implementation": platform.python_implementation(),
+                "hbc_version": hbc_version,
+                "hbc_type": "full",
             }
+            if self.config.get("owner"):
+                self.logger.debug(f"Adding owner from config: {self.config['owner']}")
+                data["owner"] = self.config["owner"]
             
             # Add Linux-specific distribution info
             if platform.system() == "Linux":

hbd/client/plugins/ping_monitor.py

@@ -0,0 +1,147 @@
+"""Ping Monitor Plugin for Heartbeat.
+
+Pings one or more hosts and reports round-trip time.  Results are sent as
+plugin metrics so the server-side threshold system can raise WARNING/CRITICAL
+alerts using the same RTT threshold configuration format used for heartbeat RTT.
+
+Example configuration in ~/.hbc.yaml (or the plugins section of ~/.hb.yaml):
+
+```yaml
+plugins:
+  ping_monitor:
+    interval: 60          # ping every 60 seconds (default)
+    count: 3              # ICMP packets per ping run (default 3)
+    timeout: 5            # seconds before a host is considered unreachable (default 5)
+    hosts:
+      - 8.8.8.8
+      - 192.168.1.1
+```
+
+Reported metrics per host (metric key uses the hostname with dots/colons replaced
+by underscores so it is a valid identifier):
+
+  ping.<hostname>.rtt_avg   – average RTT in ms  (float, or inf if unreachable)
+  ping.<hostname>.rtt_min   – minimum RTT in ms
+  ping.<hostname>.rtt_max   – maximum RTT in ms
+  ping.<hostname>.loss      – packet loss percentage (0–100)
+
+Server-side threshold config example:
+
+```yaml
+threshold_configs:
+  default:
+    thresholds:
+      ping_monitor:
+        8_8_8_8_rtt_avg:
+          warning: 20.0
+          critical: 100.0
+```
+"""
+
+import asyncio
+import re
+import sys
+from typing import Any, Dict, Optional
+
+from hbd.client.plugin import MonitorPlugin
+
+
+def _host_key(host: str) -> str:
+    """Convert a hostname/IP to a safe metric key (replace . and : with _)."""
+    return re.sub(r"[^a-zA-Z0-9_]", "_", host)
+
+
+class PingMonitorPlugin(MonitorPlugin):
+    """Ping one or more configured hosts and report RTT metrics."""
+
+    name = "ping_monitor"
+    version = "1.0.0"
+    description = "ICMP ping latency monitoring"
+    interval = 60
+
+    def __init__(self, config: Optional[Dict[str, Any]] = None):
+        super().__init__(config)
+        cfg = config or {}
+        self.interval = cfg.get("interval", 60)
+        self.count = int(cfg.get("count", 3))
+        self.timeout = int(cfg.get("timeout", 5))
+        # hosts: dict of {hostname: {warning: x, critical: y}} or list of hostnames
+        raw_hosts = cfg.get("hosts", {})
+        if isinstance(raw_hosts, list):
+            self.hosts = {h: {} for h in raw_hosts}
+        else:
+            self.hosts = dict(raw_hosts)
+
+    async def initialize(self) -> bool:
+        if not self.hosts:
+            self.logger.warning("ping_monitor: no hosts configured, plugin disabled")
+            return False
+        self.logger.info(
+            "ping_monitor initialized: %d host(s), interval=%ds, count=%d, timeout=%ds",
+            len(self.hosts), self.interval, self.count, self.timeout,
+        )
+        return True
+
+    async def _ping(self, host: str) -> Dict[str, float]:
+        """Run a system ping command and return rtt_min/avg/max/loss."""
+        if sys.platform == "win32":
+            cmd = ["ping", "-n", str(self.count), "-w", str(self.timeout * 1000), host]
+        else:
+            cmd = ["ping", "-c", str(self.count), "-W", str(self.timeout), host]
+
+        try:
+            proc = await asyncio.create_subprocess_exec(
+                *cmd,
+                stdout=asyncio.subprocess.PIPE,
+                stderr=asyncio.subprocess.PIPE,
+            )
+            stdout, _ = await asyncio.wait_for(
+                proc.communicate(),
+                timeout=self.timeout * self.count + 2,
+            )
+            output = stdout.decode(errors="replace")
+        except (asyncio.TimeoutError, FileNotFoundError, OSError) as e:
+            self.logger.warning("ping_monitor: ping failed for %s: %s", host, e)
+            return {"rtt_min": float("inf"), "rtt_avg": float("inf"),
+                    "rtt_max": float("inf"), "loss": 100.0}
+
+        # Parse packet loss
+        loss = 100.0
+        loss_match = re.search(r"(\d+(?:\.\d+)?)\s*%\s*packet\s*loss", output)
+        if loss_match:
+            loss = float(loss_match.group(1))
+
+        # Parse rtt min/avg/max — Linux: "rtt min/avg/max/mdev = x/x/x/x ms"
+        #                          macOS: "round-trip min/avg/max/stddev = x/x/x/x ms"
+        rtt_match = re.search(
+            r"(?:rtt|round-trip)\s+min/avg/max/\S+\s*=\s*([\d.]+)/([\d.]+)/([\d.]+)",
+            output,
+        )
+        if rtt_match:
+            return {
+                "rtt_min": float(rtt_match.group(1)),
+                "rtt_avg": float(rtt_match.group(2)),
+                "rtt_max": float(rtt_match.group(3)),
+                "loss": loss,
+            }
+
+        # Host unreachable or all packets lost
+        return {"rtt_min": float("inf"), "rtt_avg": float("inf"),
+                "rtt_max": float("inf"), "loss": loss}
+
+    async def _collect_metrics(self) -> Dict[str, Any]:
+        data: Dict[str, Any] = {}
+        tasks = {host: asyncio.create_task(self._ping(host)) for host in self.hosts}
+        for host, task in tasks.items():
+            try:
+                result = await task
+            except Exception as e:
+                self.logger.error("ping_monitor: error pinging %s: %s", host, e)
+                result = {"rtt_min": float("inf"), "rtt_avg": float("inf"),
+                          "rtt_max": float("inf"), "loss": 100.0}
+            key = _host_key(host)
+            for metric, value in result.items():
+                data[f"{key}_{metric}"] = value
+            status = "unreachable" if result["loss"] == 100.0 else f"{result['rtt_avg']:.1f}ms"
+            self.logger.debug("ping_monitor: %s -> %s", host, status)
+        return data

hbd/client/plugins/zfs_monitor.py

@@ -0,0 +1,140 @@
+"""
+ZFS pool monitoring plugin for Heartbeat.
+
+Collects per-pool health, capacity, and cumulative I/O statistics via zpool(8).
+"""
+
+import asyncio
+import logging
+import shutil
+from typing import Any, Dict, List, Optional
+
+from hbd.client.plugin import MonitorPlugin
+
+logger = logging.getLogger(__name__)
+
+
+def _int(s: str) -> Optional[int]:
+    try:
+        return int(s.strip().rstrip("KMGTkBkmgt%x"))
+    except (ValueError, AttributeError):
+        return None
+
+
+def _float(s: str) -> Optional[float]:
+    try:
+        return float(s.strip().rstrip("%x"))
+    except (ValueError, AttributeError):
+        return None
+
+
+class ZFSMonitorPlugin(MonitorPlugin):
+    """Monitor ZFS pool health, capacity, and I/O statistics.
+
+    Collects per pool:
+    - health: ONLINE, DEGRADED, FAULTED, etc.
+    - size / alloc / free: total, allocated and free bytes
+    - capacity: percentage used (0-100)
+    - frag: fragmentation percentage
+    - dedup: deduplication ratio
+    - read_ops / write_ops: cumulative I/O operations since last boot/clear
+    - read_bw / write_bw: cumulative bytes transferred since last boot/clear
+
+    Configuration:
+        interval: collection interval in seconds (default: 300)
+        pools: list of pool names to monitor (default: all)
+    """
+
+    name = "zfs_monitor"
+    description = "ZFS pool health, capacity, and I/O statistics"
+    interval = 300
+
+    def __init__(self, config: Optional[Dict[str, Any]] = None):
+        super().__init__(config)
+        self.interval = self.config.get("interval", 300)
+        self._pools_filter: Optional[List[str]] = self.config.get("pools", None)
+
+    async def initialize(self) -> bool:
+        if not shutil.which("zpool"):
+            self.skip_reason = "zpool not found"
+            return False
+        logger.info("ZFS monitor initialized (interval: %ds)", self.interval)
+        return True
+
+    async def _run(self, *args: str) -> List[str]:
+        """Run a command and return its stdout lines, or [] on error."""
+        try:
+            proc = await asyncio.create_subprocess_exec(
+                *args,
+                stdout=asyncio.subprocess.PIPE,
+                stderr=asyncio.subprocess.DEVNULL,
+            )
+            stdout, _ = await asyncio.wait_for(proc.communicate(), timeout=15)
+            return stdout.decode(errors="replace").splitlines()
+        except (FileNotFoundError, asyncio.TimeoutError) as exc:
+            logger.warning("zfs_monitor: %s: %s", args[0], exc)
+            return []
+
+    async def _zpool_list(self) -> Dict[str, Dict]:
+        """Return per-pool health and capacity from `zpool list`."""
+        lines = await self._run(
+            "zpool", "list", "-H", "-p",
+            "-o", "name,health,size,alloc,free,cap,frag,dedup",
+        )
+        pools: Dict[str, Dict] = {}
+        for line in lines:
+            parts = line.split("\t")
+            if len(parts) < 8:
+                continue
+            name = parts[0].strip()
+            if self._pools_filter and name not in self._pools_filter:
+                continue
+            health = parts[1].strip()
+            if health == "ONLINE":
+                status = 0
+            elif health in ("DEGRADED", "ONLINE with errors"):
+                status = 1
+            elif health in ("FAULTED", "OFFLINE", "UNAVAIL"):
+                status = 2
+            else:
+                status = 3  # unknown status
+            pools[name] = {
+                "health":    health,
+                "status": status,
+                "size":      _int(parts[2]),
+                "alloc":     _int(parts[3]),
+                "free":      _int(parts[4]),
+                "capacity":  _float(parts[5]),
+                "frag":      _float(parts[6]),
+                "dedup":     _float(parts[7]),
+            }
+        return pools
+
+    async def _zpool_iostat(self) -> Dict[str, Dict]:
+        """Return per-pool cumulative I/O counters from `zpool iostat`."""
+        lines = await self._run("zpool", "iostat", "-H", "-p")
+        io: Dict[str, Dict] = {}
+        for line in lines:
+            parts = line.split("\t")
+            if len(parts) < 7:
+                continue
+            name = parts[0].strip()
+            if not name or name.startswith(" "):
+                continue
+            io[name] = {
+                "read_ops": _int(parts[3]),
+                "write_ops": _int(parts[4]),
+                "read_bw":  _int(parts[5]),
+                "write_bw": _int(parts[6]),
+            }
+        return io
+
+    async def _collect_metrics(self) -> Dict[str, Any]:
+        pools, io = await asyncio.gather(self._zpool_list(), self._zpool_iostat())
+        for name, stats in io.items():
+            if name in pools:
+                pools[name].update(stats)
+        return {"pools": pools}
+
+
+plugin = ZFSMonitorPlugin

hbd/common/__init__.py

@@ -1,3 +1,3 @@
 """Common utilities shared between hbc and hbd."""
 
-__version__ = "5.0.5"
+from hbd import __version__

hbd/common/proto.py

@@ -52,12 +52,17 @@ def decode_value(val: str) -> Any:
         except Exception:
             return val[1:]  # Return as string without @
     
-    # Try numeric evaluation (original behavior)
+    # Try numeric conversion (avoid eval to prevent SyntaxWarnings on version strings)
     if val[0].isdigit() or (val[0] == '-' and len(val) > 1 and val[1].isdigit()):
         try:
-            return eval(val)
+            return int(val)
-        except Exception:
+        except ValueError:
-            return val
+            pass
+        try:
+            return float(val)
+        except ValueError:
+            pass
+        return val
     
     return val
 

hbd/config_thresholds_example.yaml

@@ -134,6 +134,31 @@ thresholds:
           hysteresis: 0.1
           enabled: true
   
+  # ----------------------------------------------------------------------------
+  # ZFS Monitor Thresholds
+  # ----------------------------------------------------------------------------
+  zfs_monitor:
+    # Pool health check — built-in default; shown here for reference/override.
+    # status is 0 (ONLINE) or 1 (DEGRADED) or 2 (SUSPENDED, FAULTED, UNAVAIL…).
+    # Use '*' to apply the same rule to every pool, or name a specific pool.
+    pools:
+      '*':
+        status:
+          warning: 1           # Alert WARNING when pool is DEGRADED
+          critical: 2           # Alert CRITICAL when pool is SUSPENDED/FAULTED/UNAVAIL
+          operator: ">="
+          hysteresis: 0.0       # No hysteresis — a degraded pool is always alerting
+          grace: 0              # Fire immediately — don't wait for a second collection
+          display: "ZFS pool {pool_name} is {health}"
+
+      # Per-pool capacity thresholds (optional; add pools you care about)
+      # tank:
+      #   capacity:
+      #     warning: 75.0       # Warn at 75% used
+      #     critical: 90.0      # Critical at 90% used
+      #     operator: ">"
+      #     hysteresis: 0.05
+
   # ----------------------------------------------------------------------------
   # Network Monitor Thresholds
   # ----------------------------------------------------------------------------

hbd/server/__init__.py

@@ -1,3 +1,3 @@
 """HeartBeat Daemon (hbd) - Server/daemon component."""
 
-__version__ = "5.0.5"
+from hbd import __version__

hbd/server/cli.py

@@ -1,6 +1,8 @@
 """Command line interface for hbd package."""
 
 import argparse
+import getpass
+import sys
 
 from .config import load_config
 from .main import run as run_server
@@ -14,26 +16,272 @@ def build_parser():
         description="HeartBeatDaemon - Wait for heartbeat messages and act on them (or their absence)",
         formatter_class=argparse.RawDescriptionHelpFormatter,
     )
-    parser.add_argument(
+
-        "-c", "--config", dest="configfile", help="Config file path (YAML)"
+    subparsers = parser.add_subparsers(dest="command")
-    )
+
-    parser.add_argument(
+    # --- serve (default) ---
-        "-f", "--foreground", action="store_true", help="Run in foreground"
+    serve_p = subparsers.add_parser("serve", help="Start the hbd server (default)")
-    )
+    serve_p.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
+    serve_p.add_argument("-f", "--foreground", action="store_true", help="Run in foreground")
+    serve_p.add_argument("-v", "--verbose", action="store_true", help="Verbose output")
+    serve_p.add_argument("-p", "--pushsrv", dest="pushsrv", choices=PUSHSRVS,
+                         help="Push service to use")
+    serve_p.add_argument("-x", "--debug", action="count", default=0, help="Increase debug level")
+
+    # Legacy top-level flags (no subcommand) — kept for backward compatibility
+    parser.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
+    parser.add_argument("-f", "--foreground", action="store_true", help="Run in foreground")
     parser.add_argument("-v", "--verbose", action="store_true", help="Verbose output")
-    parser.add_argument(
+    parser.add_argument("-p", "--pushsrv", dest="pushsrv", choices=PUSHSRVS,
-        "-p", "--pushsrv", dest="pushsrv", choices=PUSHSRVS, help="Push service to use"
+                        help="Push service to use")
+    parser.add_argument("-x", "--debug", action="count", default=0, help="Increase debug level")
+
+    # --- passwd ---
+    passwd_p = subparsers.add_parser(
+        "passwd",
+        help="Generate a password hash for use in the config file",
     )
-    parser.add_argument(
+    passwd_p.add_argument(
-        "-x", "--debug", action="count", default=0, help="Increase debug level"
+        "username",
+        nargs="?",
+        help="Username (informational only, for display)",
     )
+
+    # --- notify ---
+    notify_p = subparsers.add_parser(
+        "notify",
+        help="Send a test message via a configured notification channel",
+    )
+    notify_p.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
+    notify_p.add_argument(
+        "channel",
+        help="Channel name as defined in notification_channels",
+    )
+    notify_p.add_argument(
+        "message",
+        nargs="?",
+        default="Test notification from hbd",
+        help="Message body (default: 'Test notification from hbd')",
+    )
+    notify_p.add_argument(
+        "--level",
+        default="WARNING",
+        choices=["INFO", "WARNING", "CRITICAL", "RECOVER"],
+        help="Notification level (default: WARNING)",
+    )
+    notify_p.add_argument(
+        "--title",
+        default=None,
+        help="Notification title (default: '[LEVEL] test')",
+    )
+
+    # --- stop ---
+    stop_p = subparsers.add_parser("stop", help="Stop the running hbd instance")
+    stop_p.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
+
+    # --- reload ---
+    reload_p = subparsers.add_parser("reload", help="Reload configuration (SIGHUP)")
+    reload_p.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
+
+    # --- restart ---
+    restart_p = subparsers.add_parser("restart", help="Restart the running hbd instance")
+    restart_p.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
+    restart_p.add_argument("-f", "--foreground", action="store_true", help="Run in foreground after restart")
+    restart_p.add_argument("-v", "--verbose", action="store_true", help="Verbose output after restart")
+
     return parser
 
 
+def cmd_passwd(args):
+    """Interactive password hash generator."""
+    from .users import hash_password
+
+    username = args.username or ""
+    prompt = f"New password for {username}: " if username else "New password: "
+    while True:
+        pw = getpass.getpass(prompt)
+        if not pw:
+            print("Password must not be empty.", file=sys.stderr)
+            continue
+        pw2 = getpass.getpass("Confirm password: ")
+        if pw != pw2:
+            print("Passwords do not match, try again.", file=sys.stderr)
+            continue
+        break
+
+    hashed = hash_password(pw)
+    if username:
+        print(f"\nAdd the following to your config under users: -> {username}:")
+    else:
+        print("\nPassword hash (paste into config file under the user's 'password' key):")
+    print(f"  password: {hashed}")
+
+
+def cmd_notify(args):
+    """Send a test message via a single notification channel."""
+    from .config import load_config
+    from .notify import Notification, _dispatch_to_channel, setup
+
+    config = load_config(args.configfile)
+    setup(config)
+
+    channels = config.get("notification_channels", {})
+    if args.channel not in channels:
+        available = ", ".join(channels.keys()) if channels else "(none)"
+        print(f"Error: channel '{args.channel}' not found in notification_channels.", file=sys.stderr)
+        print(f"Available channels: {available}", file=sys.stderr)
+        sys.exit(1)
+
+    channel_cfg = channels[args.channel]
+    level = args.level.upper()
+    title = args.title or f"[{level}] test"
+    base_url = config.get("base_url", "").rstrip("/")
+
+    notif = Notification(
+        title=title,
+        body=args.message,
+        level=level,
+        url=f"{base_url}/plugins" if base_url else "",
+    )
+
+    import asyncio
+    from .notify import _send_matrix_async, _send_sms_voipms_async, _DRIVERS
+    ch_type = channel_cfg.get("type", "")
+    print(f"Sending via {args.channel} ({ch_type}): {title} — {args.message}")
+
+    if ch_type == "matrix":
+        ok = asyncio.run(_send_matrix_async(channel_cfg, notif))
+    elif ch_type == "sms_voipms":
+        ok = asyncio.run(_send_sms_voipms_async(channel_cfg, notif))
+    else:
+        driver = _DRIVERS.get(ch_type)
+        if driver is None:
+            print(f"Error: unknown channel type '{ch_type}'", file=sys.stderr)
+            sys.exit(1)
+        ok = driver(channel_cfg, notif)
+
+    if ok:
+        print("OK")
+    else:
+        print("FAILED — check logs for details", file=sys.stderr)
+        sys.exit(1)
+
+
+def _read_pid(configfile) -> int | None:
+    """Return the PID from the pidfile, or None if not found / not running."""
+    import os
+    config = load_config(configfile)
+    pidfile = config.get("pidfile", "")
+    if not pidfile:
+        print("Error: no pidfile configured.", file=sys.stderr)
+        return None
+    try:
+        with open(pidfile) as f:
+            pid = int(f.read().strip())
+        # Verify process is actually running
+        os.kill(pid, 0)
+        return pid
+    except FileNotFoundError:
+        print(f"PID file not found ({pidfile}). Is hbd running?", file=sys.stderr)
+        return None
+    except ProcessLookupError:
+        print(f"PID file exists but process {pid} is not running.", file=sys.stderr)
+        return None
+    except Exception as e:
+        print(f"Error reading pidfile: {e}", file=sys.stderr)
+        return None
+
+
+def cmd_stop(args):
+    import os, signal as _signal, time
+    pid = _read_pid(args.configfile)
+    if pid is None:
+        sys.exit(1)
+    print(f"Stopping hbd (pid {pid})...")
+    os.kill(pid, _signal.SIGTERM)
+    # Wait up to 10 s for the process to exit
+    for _ in range(20):
+        time.sleep(0.5)
+        try:
+            os.kill(pid, 0)
+        except ProcessLookupError:
+            print("hbd stopped.")
+            return
+    print("Warning: hbd did not stop within 10 seconds.", file=sys.stderr)
+    sys.exit(1)
+
+
+def cmd_reload(args):
+    import os, signal as _signal
+    pid = _read_pid(args.configfile)
+    if pid is None:
+        sys.exit(1)
+    print(f"Sending SIGHUP to hbd (pid {pid})...")
+    os.kill(pid, _signal.SIGHUP)
+    print("Reload signal sent.")
+
+
+def cmd_restart(args):
+    import os, signal as _signal, time, subprocess
+    pid = _read_pid(args.configfile)
+    if pid is not None:
+        print(f"Stopping hbd (pid {pid})...")
+        os.kill(pid, _signal.SIGTERM)
+        for _ in range(20):
+            time.sleep(0.5)
+            try:
+                os.kill(pid, 0)
+            except ProcessLookupError:
+                print("hbd stopped.")
+                break
+        else:
+            print("Warning: hbd did not stop within 10 seconds.", file=sys.stderr)
+            sys.exit(1)
+    else:
+        print("hbd does not appear to be running — starting fresh.")
+
+    # Re-launch hbd with the same config
+    cmd = [sys.executable, "-m", "hbd.server.cli", "serve"]
+    if args.configfile:
+        cmd += ["-c", args.configfile]
+    if getattr(args, "foreground", False):
+        cmd += ["-f"]
+    if getattr(args, "verbose", False):
+        cmd += ["-v"]
+
+    if getattr(args, "foreground", False):
+        # Run in foreground — replace current process
+        os.execv(sys.executable, cmd)
+    else:
+        subprocess.Popen(cmd, start_new_session=True)
+        print("hbd restarted.")
+
+
 def main(argv=None):
     parser = build_parser()
     args = parser.parse_args(argv)
 
+    if args.command == "passwd":
+        cmd_passwd(args)
+        return
+
+    if args.command == "notify":
+        cmd_notify(args)
+        return
+
+    if args.command == "stop":
+        cmd_stop(args)
+        return
+
+    if args.command == "reload":
+        cmd_reload(args)
+        return
+
+    if args.command == "restart":
+        cmd_restart(args)
+        return
+
+    # Default: run the server (supports both `hbd serve ...` and `hbd ...`)
     config = load_config(args.configfile)
 
     # Apply CLI overrides

hbd/server/config.py

@@ -14,35 +14,38 @@ SERVER_DEFAULTS = {
     "hb_port": 50003,           # Port to listen for heartbeats
     "hbd_port": 50004,          # HTTP API port
     "hbd_host": "",             # Bind address (empty = all interfaces)
-    
+
     # Persistence
-    "pickfile": "/tmp/hb.pick",
+    "pickfile": os.path.join(os.path.expanduser("~"), ".hb.pick"),  # File to store host state between restarts
-    
+    "pidfile": os.path.join(os.path.expanduser("~"), ".hb.pid"),    # PID file for stop/restart/reload
+
     # Logging
-    "logfile": "/var/log/heartbeat.log",
+    "logfile": os.path.join(os.path.expanduser("~"), ".hb.log"),
-    "logfmt": "text",           # text or msg or json
-    
     # Notification channels
     "notification_channels": {},  # Named channels with type and credentials
-    "default_notification_channels": [],  # Default channels if host doesn't specify
+    "base_url": "",               # Base URL for notification links (e.g. https://hbd.example.com)
-    
+
     # Monitoring settings
     "interval": 20,             # Expected heartbeat interval (for server checks)
-    "grace": 2,                 # Grace multiplier (interval * grace = timeout)
+    "grace": 2,                 # Grace period (extra seconds before notifying after a missed heartbeat)
     "threshold_renotify_interval": 3600,  # Seconds between threshold re-notifications
-    
+
+    # User management
+    "users": {},                # username -> {full_name, avatar, password, admin, notification_channels}
+    "default_owner": None,      # Username that owns hosts with no explicit owner
+
+    # OAuth2 providers
+    "oauth": {},                 # oauth.gitea.{url,client_id,client_secret}
+
     # Host management
-    "hosts": {},                # New unified host definitions (optional)
+    "hosts": {},                # Unified host definitions
-    "watchhosts": [],           # Hosts to monitor and notify about (legacy)
+    "dyndomains": ["example.org"], # Domains to update via nsupdate when a host with dyndns: true is updated
-    "dyndnshosts": [],          # Hosts with dynamic DNS (legacy)
+
-    "drophosts": [],            # Hosts to ignore
-    "dyndomains": ["wrede.org"],
-    
     # DNS updates
-    "nsupdate_bin": "/usr/bin/nsupdate",
+    "nsupdate_bin": "/usr/bin/nsupdate", # Path to nsupdate binary
     
     # WebSocket settings
-    "ws_port": 50005,
+    "ws_port": 50005, 
     "wss_port": None,
     "cert_path": "/usr/local/etc/ssl/",
     "wss_pem": "fullchain.pem",
@@ -65,6 +68,66 @@ SERVER_DEFAULTS = {
     "thresholds": {},
 }
 
+THRESHOLD_DEFAULTS = {
+    'thresholds': {
+        'cpu_monitor': {
+            'cpu_percent': {
+                'warning': 80.0, 
+                'critical': 90.0
+                }
+            },
+            'memory_monitor': {
+                'memory_percent': {
+                    'warning': 85.0,
+                    'critical': 95.0
+                },
+                'swap_percent': {
+                    'warning': 40.0,
+                    'critical': 75.0
+                }
+            },
+            'disk_monitor': {
+                'partitions': {
+                    '/': {
+                        'percent': {
+                            'warning': 85.0,
+                            'critical': 90.0
+                        }
+                    }
+                }
+            },
+            'rtt': {
+                'warning': 200,
+                'critical': 250.0,
+                'count': 3  # Optional: number of consecutive breaches before alerting
+            },
+            'nagios_runner': {
+                'status_code': {
+                    'display': '{check_name} {output}',
+                    'operator': "nagios"
+                }
+            },
+            'zfs_monitor': {
+                'pools': {
+                    '*': {
+                        'status': {
+                            'warning': 1,
+                            'critical': 2,
+                            'operator': '>=',
+                            'hysteresis': 0.0,
+                            'grace': 0,
+                            'display': 'ZFS pool {pool_name} is {health}'
+                        },
+                        'capacity': {
+                            'warning': 80.0,
+                            'critical': 90.0,
+                        }
+                    }
+                }
+            },
+        }
+    }
+
 
 def load_config(path=None):
     """Load configuration from a YAML file and merge with server defaults.
@@ -182,159 +245,88 @@ class ReloadableConfig:
 
 
 def get_watchhosts(config):
-    """Extract watchhosts from config, supporting both new and legacy formats.
+    """Extract watched hostnames from config (hosts with watch: true).
-    
+
-    Args:
-        config: Configuration dictionary
-        
     Returns:
-        List of hostnames to watch
+#        List of hostnames to watch
     """
     watchhosts = []
-    
+    hosts_config = config.get("hosts", {})
-    # New format: hosts section with watch attribute
+    if isinstance(hosts_config, dict):
-    if "hosts" in config:
+        for host_name, host_attrs in hosts_config.items():
-        hosts_config = config["hosts"]
+            if isinstance(host_attrs, dict) and host_attrs.get("watch", True):
-        if isinstance(hosts_config, dict):
+                watchhosts.append(host_name)
-            for host_name, host_attrs in hosts_config.items():
+    return watchhosts
-                if isinstance(host_attrs, dict) and host_attrs.get("watch", False):
-                    watchhosts.append(host_name)
-    
-    # Legacy format: watchhosts list
-    if "watchhosts" in config:
-        legacy_watchhosts = config.get("watchhosts", [])
-        if isinstance(legacy_watchhosts, (list, set)):
-            watchhosts.extend(legacy_watchhosts)
-        elif isinstance(legacy_watchhosts, dict):
-            # Old dict format: {"host1": {attrs}, "host2": {attrs}}
-            watchhosts.extend(legacy_watchhosts.keys())
-    
-    return list(set(watchhosts))  # Remove duplicates
 
 
 def get_dyndnshosts(config):
-    """Extract dyndnshosts from config, supporting both new and legacy formats.
+    """Return hostnames that have a dyndns setting in the hosts section."""
-    
+    hosts_config = config.get("hosts", {})
-    Args:
+    if not isinstance(hosts_config, dict):
-        config: Configuration dictionary
+        return []
-        
+    return [
-    Returns:
+        name for name, attrs in hosts_config.items()
-        List of hostnames with dynamic DNS
+        if isinstance(attrs, dict) and attrs.get("dyndns")
-    """
+    ]
-    dyndnshosts = []
-    
-    # New format: hosts section with dyndns attribute
-    if "hosts" in config:
-        hosts_config = config["hosts"]
-        if isinstance(hosts_config, dict):
-            for host_name, host_attrs in hosts_config.items():
-                if isinstance(host_attrs, dict) and host_attrs.get("dyndns", False):
-                    dyndnshosts.append(host_name)
-    
-    # Legacy format: dyndnshosts list/set
-    if "dyndnshosts" in config:
-        legacy_dyndnshosts = config.get("dyndnshosts", [])
-        if isinstance(legacy_dyndnshosts, (list, set)):
-            dyndnshosts.extend(legacy_dyndnshosts)
-    
-    return list(set(dyndnshosts))  # Remove duplicates
 
 
 def get_host_config(config, hostname):
-    """Get configuration for a specific host.
+    """Get configuration for a specific host from the hosts section.
-    
+
-    Args:
-        config: Configuration dictionary
-        hostname: Host name
-        
     Returns:
         Dictionary with host attributes or empty dict
     """
-    if "hosts" in config:
+    hosts_config = config.get("hosts", {})
-        hosts_config = config.get("hosts", {})
+    if isinstance(hosts_config, dict) and hostname in hosts_config:
-        if isinstance(hosts_config, dict) and hostname in hosts_config:
+        val = hosts_config[hostname]
-            return hosts_config[hostname] if isinstance(hosts_config[hostname], dict) else {}
+        return val if isinstance(val, dict) else {}
-    
-    # Check legacy watchhosts for notification settings
-    if "watchhosts" in config:
-        watchhosts = config.get("watchhosts", {})
-        if isinstance(watchhosts, dict) and hostname in watchhosts:
-            legacy_attrs = watchhosts[hostname]
-            if isinstance(legacy_attrs, dict):
-                # Convert legacy format to new format
-                return {
-                    "watch": True,
-                    "notify": legacy_attrs.get("notify"),
-                    "notify_src": legacy_attrs.get("src"),
-                }
-    
     return {}
 
 
-def get_notification_channels_for_host(config, hostname):
+# ---------------------------------------------------------------------------
-    """Get notification channels configured for a specific host.
+# User / host-access helpers
-    
+# ---------------------------------------------------------------------------
-    Args:
-        config: Configuration dictionary
-        hostname: Host name
-        
-    Returns:
-        List of channel names to use for this host
-    """
-    host_config = get_host_config(config, hostname)
-    
-    # Check if host specifies notification channels
-    channels = host_config.get("notification_channels", [])
-    if channels:
-        if isinstance(channels, str):
-            return [channels]
-        elif isinstance(channels, list):
-            return channels
-    
-    # Fall back to default channels
-    default_channels = config.get("default_notification_channels", [])
-    if default_channels:
-        if isinstance(default_channels, str):
-            return [default_channels]
-        elif isinstance(default_channels, list):
-            return default_channels
-    
-    # No channels configured, return empty list (will use legacy global config)
-    return []
 
-
+def get_default_owner(config) -> str | None:
-def get_channel_config(config, channel_name):
+    """Return the configured default_owner username, or the first admin user, or None."""
-    """Get configuration for a specific notification channel.
+    explicit = config.get("default_owner")
-    
+    if explicit:
-    Args:
+        return explicit
-        config: Configuration dictionary
+    # Fall back to first admin user found in config
-        channel_name: Name of the notification channel
+    users_cfg = config.get("users", {})
-        
+    if isinstance(users_cfg, dict):
-    Returns:
+        for username, attrs in users_cfg.items():
-        Dictionary with channel configuration or None if not found
+            if isinstance(attrs, dict) and attrs.get("admin", False):
-    """
+                return username
-    channels = config.get("notification_channels", {})
-    if isinstance(channels, dict) and channel_name in channels:
-        return channels[channel_name]
     return None
 
 
-def get_notification_channels_config(config, hostname):
+def get_host_access(config, hostname) -> dict:
-    """Get list of notification channel configurations for a host.
+    """Return the access dict for *hostname*: owner, managers, monitors.
-    
+
-    Args:
+    Falls back to default_owner for hosts without an explicit owner.
-        config: Configuration dictionary
+
-        hostname: Host name
-        
     Returns:
-        List of (channel_name, channel_config) tuples
+        {
+            "owner": str | None,
+            "managers": list[str],
+            "monitors": list[str],
+        }
     """
-    channel_names = get_notification_channels_for_host(config, hostname)
+    host_cfg = get_host_config(config, hostname)
-    
+
-    channels = []
+    owner = host_cfg.get("owner") # or get_default_owner(config)
-    for channel_name in channel_names:
+
-        channel_config = get_channel_config(config, channel_name)
+    managers = host_cfg.get("managers", [])
-        if channel_config and channel_config.get("type"):
+    if isinstance(managers, str):
-            channels.append((channel_name, channel_config))
+        managers = [managers]
-    
+
-    return channels
+    monitors = host_cfg.get("monitors", [])
+    if isinstance(monitors, str):
+        monitors = [monitors]
+
+    return {
+        "owner": owner,
+        "managers": list(managers),
+        "monitors": list(monitors),
+    }

hbd/server/configio.py

@@ -0,0 +1,136 @@
+"""YAML round-trip read/write for .hb.yaml, with backup and atomic writes."""
+
+import glob
+import os
+import threading
+from datetime import datetime
+
+from ruamel.yaml import YAML
+
+_write_lock = threading.Lock()
+
+
+def _make_yaml() -> YAML:
+    y = YAML()
+    y.preserve_quotes = True
+    return y
+
+# Top-level keys managed by the 'server' logical section
+_SERVER_KEYS = [
+    "hbd_port", "hbd_host", "ws_port", "wss_port", "hb_port",
+    "interval", "grace", "base_url", "threshold_renotify_interval",
+    "logfile", "pidfile", "pickfile", "journal_enabled", "journal_dir",
+    "journal_max_size", "journal_max_backups", "default_owner",
+    "default_threshold_config",
+]
+
+# Top-level keys managed by the 'dns' logical section
+_DNS_KEYS = ["nsupdate_bin", "rndc_key", "dyndomains"]
+
+
+def read_roundtrip(path: str):
+    """Load .hb.yaml with ruamel.yaml, preserving comments and ordering."""
+    with open(path, "r", encoding="utf-8") as f:
+        return _make_yaml().load(f)
+
+
+def write_config(path: str, data) -> None:
+    """Backup current file then atomically write data.
+
+    Backup naming: {path}.bak.YYYYMMDD-HHMMSS
+    Rotation: keep the 10 most recent backups, delete older ones.
+    Atomic write: write to {path}.tmp then os.replace({path}.tmp, path).
+    Acquires _write_lock for the full backup+write sequence.
+    """
+    with _write_lock:
+        ts = datetime.now().strftime("%Y%m%d-%H%M%S")
+        backup_path = f"{path}.bak.{ts}"
+        n = 0
+        while os.path.exists(backup_path):
+            n += 1
+            backup_path = f"{path}.bak.{ts}-{n}"
+        orig_mode = None
+        if os.path.exists(path):
+            orig_mode = os.stat(path).st_mode
+            with open(path, "rb") as src, open(backup_path, "wb") as dst:
+                dst.write(src.read())
+            os.chmod(backup_path, orig_mode)
+        backups = sorted(glob.glob(f"{path}.bak.*"), reverse=True)
+        for old in backups[10:]:
+            os.unlink(old)
+        tmp = f"{path}.tmp"
+        try:
+            with open(tmp, "w", encoding="utf-8") as f:
+                _make_yaml().dump(data, f)
+            if orig_mode is not None:
+                os.chmod(tmp, orig_mode)
+            os.replace(tmp, path)
+        except Exception:
+            try:
+                os.unlink(tmp)
+            except OSError:
+                pass
+            raise
+
+
+def list_backups(path: str) -> list:
+    """Return backup paths sorted newest-first."""
+    return sorted(glob.glob(f"{path}.bak.*"), reverse=True)
+
+
+def apply_structured_section(data, section: str, values: dict) -> None:
+    """Merge a dict of scalar/list values into data for the named logical section.
+
+    For 'server': updates each known key individually, preserving comments on
+    unchanged keys. For 'users': replaces the entire users dict.
+    """
+    if section == "server":
+        for key in _SERVER_KEYS:
+            if key in values:
+                data[key] = values[key]
+    elif section == "dns":
+        for key in _DNS_KEYS:
+            if key in values:
+                data[key] = values[key]
+            else:
+                data.pop(key, None)
+    elif section == "users":
+        data["users"] = values
+    elif section == "hosts":
+        data["hosts"] = values
+    else:
+        raise ValueError(f"Unknown structured section: {section!r}")
+
+
+def apply_channel(data, name: str, channel_cfg: dict) -> None:
+    """Insert or replace a single notification channel entry, preserving others."""
+    if not data.get("notification_channels"):
+        data["notification_channels"] = {}
+    data["notification_channels"][name] = channel_cfg
+
+
+def delete_channel(data, name: str) -> None:
+    """Remove a notification channel by name. No-op if not found."""
+    nc = data.get("notification_channels") or {}
+    nc.pop(name, None)
+
+
+def apply_yaml_section(data, section: str, yaml_text: str) -> None:
+    """Replace the named logical section by parsing yaml_text."""
+    parsed = _make_yaml().load(yaml_text)
+    if section == "notification_channels":
+        data["notification_channels"] = parsed
+    elif section == "thresholds":
+        data["threshold_configs"] = parsed
+    elif section == "hosts":
+        data["hosts"] = parsed
+    elif section == "dns":
+        if parsed:
+            for key in _DNS_KEYS:
+                if key in parsed:
+                    data[key] = parsed[key]
+        else:
+            for key in _DNS_KEYS:
+                data.pop(key, None)
+    else:
+        raise ValueError(f"Unknown YAML section: {section!r}")

hbd/server/dns.py

@@ -4,6 +4,9 @@ from __future__ import annotations
 from subprocess import Popen, PIPE, STDOUT
 from typing import Optional
 import asyncio
+import logging
+
+logger = logging.getLogger(__name__)
 
 
 def create_nsupdate_payload(
@@ -123,7 +126,6 @@ async def dns_update_worker(
                 pass
             continue
 
-        m = f"changed address to {addr}"
         for dyndomain in cfg.get("dyndomains", []):
             err = await loop.run_in_executor(
                 None,
@@ -135,28 +137,29 @@ async def dns_update_worker(
                 cfg.get("rndc_key", "/etc/dhcpc/rndc-key"),
             )
             if err:
-                m += f", DNS update failed: {err}"
+                m = f"DNS update failed for {addr} ({dyndomain}): {err}"
                 logger.error("DNS update failed for %s: %s", name, err)
+                if log:
+                    try:
+                        await loop.run_in_executor(None, log, name, "ERROR", m)
+                    except Exception:
+                        pass
             else:
-                m += ", DNS updated."
+                m = f"DNS updated {name}.dy.{dyndomain} → {addr}"
+                if log:
+                    try:
+                        await loop.run_in_executor(None, log, name, "INFO", m)
+                    except Exception:
+                        pass
+
+        if not cfg.get("dyndomains"):
+            logger.warning("DNS update triggered for %s but no dyndomains configured", name)
 
         try:
             dnsq.task_done()
         except Exception:
             pass
 
-        if log:
-            try:
-                await loop.run_in_executor(None, log, name, m)
-            except Exception:
-                pass
-
-    if log:
-        try:
-            await loop.run_in_executor(None, log, None, "dns_update_worker exiting")
-        except Exception:
-            pass
-
 
 def start_dns_worker(
     hbdclass,

hbd/server/hbdclass.py

@@ -95,7 +95,7 @@ class Connection:
         if not Null:
             d["addr"] = self.addr
             if self.rtts[-1]:
-                d["rtt"] = "%0.1f" % self.rtts[-1]
+                d["rtt"] = "%d" % round(self.rtts[-1])
             elif self.state == Connection.UNKNOWN:
                 d["rtt"] = ""
             else:
@@ -189,7 +189,7 @@ class Connection:
             except Exception:
                 pass
             self.addr = addr
-            Connection.htab[addr] = self.host.nameconnection_count
+            Connection.htab[addr] = self.host.name
             if self.host.isDynDns():
                 Host.dnsQ.put((self.host.name, self.addr))
         return r
@@ -297,9 +297,16 @@ class Host:
         self.plugin_retention = 100  # Keep last N samples per plugin
         # Alert state tracking: {metric_path: AlertState}
         self.alert_states = {}
+        # Stale-data timers: {plugin_name: asyncio.TimerHandle}
+        self.plugin_timers = {}
+        # User access control
+        self.owner: str | None = None       # username of owner
+        self.managers: list = []            # usernames with manager role
+        self.monitors: list = []            # usernames with monitor role
 
     def statedict(self):
         d = {}
+        d["raw_name"] = self.name
         d["name"] = self.name
         if self.dyn:
             d["name"] += "*"
@@ -360,7 +367,7 @@ class Host:
     def stateinfo(self):
         ddict = {}
         for d in self.__dict__:
-            if d in ["alert_states", "plugin_data"]:
+            if d in ["alert_states", "plugin_data", "plugin_timers"]:
                 continue
             if d == "connections":
                 cl = []
@@ -412,7 +419,20 @@ class Host:
         ddict["alert_warning_acked"] = warning_acked
         ddict["alert_critical_unacked"] = critical_unacked
         ddict["alert_critical_acked"] = critical_acked
-        
+
+        # User access
+        ddict["owner"] = getattr(self, "owner", None)
+        ddict["managers"] = list(getattr(self, "managers", []))
+        ddict["monitors"] = list(getattr(self, "monitors", []))
+
+        # hbc version from latest os_info plugin data
+        hbc_version = None
+        latest_os = self.get_latest_plugin_data("os_info")
+        if latest_os:
+            _, os_data = latest_os
+            hbc_version = os_data.get("hbc_version")
+        ddict["hbc_version"] = hbc_version
+
         return ddict
 
     def jsons(self):
@@ -458,6 +478,15 @@ class Host:
             self.plugin_retention = 100
         if not hasattr(self, "alert_states"):
             self.alert_states = {}
+        # User access fields (added in user-management feature)
+        if not hasattr(self, "owner"):
+            self.owner = None
+        if not hasattr(self, "managers"):
+            self.managers = []
+        if not hasattr(self, "monitors"):
+            self.monitors = []
+        if not hasattr(self, "plugin_timers"):
+            self.plugin_timers = {}
 
         pass
 
@@ -511,12 +540,66 @@ class Host:
     
     def get_all_plugin_data(self):
         """Get all plugin data for this host.
-        
+
         Returns:
             Dict of {plugin_name: [(timestamp, data), ...]}
         """
         return self.plugin_data
 
+    def reset_plugin_timer(self, plugin_name, timeout_seconds, callback):
+        """Reset the stale-data timer for a plugin.
+
+        If no new PLG data arrives within timeout_seconds, callback(host, plugin_name)
+        is called so the caller can clear history and alerts.
+        """
+        import asyncio
+        existing = self.plugin_timers.get(plugin_name)
+        if existing and not existing.cancelled():
+            existing.cancel()
+
+        async def _fire():
+            await callback(self, plugin_name)
+
+        try:
+            loop = asyncio.get_event_loop()
+            self.plugin_timers[plugin_name] = loop.call_later(
+                timeout_seconds, lambda: asyncio.create_task(_fire())
+            )
+        except RuntimeError:
+            pass
+
+    def cancel_plugin_timer(self, plugin_name):
+        """Cancel the stale timer for a plugin, if any."""
+        handle = self.plugin_timers.pop(plugin_name, None)
+        if handle and not handle.cancelled():
+            handle.cancel()
+
+    # ------------------------------------------------------------------
+    # User-role helpers
+    # ------------------------------------------------------------------
+
+    def apply_access(self, owner, managers, monitors):
+        """Set owner/managers/monitors on this host (called from config load)."""
+        self.owner = owner
+        self.managers = list(managers)
+        self.monitors = list(monitors)
+
+    def is_owner(self, username: str) -> bool:
+        return self.owner == username
+
+    def is_manager(self, username: str) -> bool:
+        return username in self.managers or self.is_owner(username)
+
+    def is_monitor(self, username: str) -> bool:
+        return username in self.monitors or self.is_manager(username)
+
+    def access_dict(self) -> dict:
+        return {
+            "owner": self.owner,
+            "managers": list(self.managers),
+            "monitors": list(self.monitors),
+        }
+
     hostfields_long = [
         "name",
         "IPv4.addr",

hbd/server/main.py

@@ -14,7 +14,8 @@ from . import hbdclass
 
 from . import ws as ws_mod
 from . import notify as notify_mod
-from . import data 
+from . import data
+from . import users as users_mod
 
 logger = logging.getLogger(__name__)
 msg_to_websockets = ws_mod.broadcast
@@ -22,12 +23,13 @@ eventlog = notify_mod.eventlog
 
 # shared runtime collections and helpers
 
-def cleanup_function(config, hbdclass):
+def save_state(config, hbdclass):
-    """This function will be executed upon program exit."""
+    """Save current state to pickle file. Safe to call at any time."""
-    logger.info("Running cleanup function...")
     import pickle
+    import os
+    from . import users as users_mod
 
-    # Ensure all timer references are cleared before pickling
+    # Clear timer references before pickling (they can't be serialized)
     for hostname, host in list(hbdclass.Host.hosts.items()):
         for conn_type, conn in host.connections.items():
             if hasattr(conn, 'cancel_overdue_timer'):
@@ -40,13 +42,27 @@ def cleanup_function(config, hbdclass):
                 conn.timeout_duration = None
 
     pickfile = config.get("pickfile", "hbd.pickle")
+    tmpfile = pickfile + ".tmp"
 
-    pickf = open(pickfile, "wb")
+    try:
-    pick = pickle.Pickler(pickf)
+        with open(tmpfile, "wb") as pickf:
-    pick.dump(hbdclass.Host.hosts)
+            pick = pickle.Pickler(pickf)
-    pick.dump(data.msgs)
+            pick.dump(hbdclass.Host.hosts)
-    pickf.close()
+            pick.dump(data.msgs)
+            pick.dump(users_mod.save_sessions())
+        os.replace(tmpfile, pickfile)
+    except Exception as e:
+        logger.error("Failed to save state: %s", e)
+        try:
+            os.unlink(tmpfile)
+        except Exception:
+            pass
 
+
+def cleanup_function(config, hbdclass):
+    """This function will be executed upon program exit."""
+    logger.info("Running cleanup function...")
+    save_state(config, hbdclass)
     logger.info("Cleanup complete.")
 
 
@@ -62,19 +78,31 @@ async def reload_configuration(config_obj, config_path, components):
         True if reload succeeded, False otherwise
     """
     try:
-        logger.info("=" * 60)
         logger.info("Starting configuration reload...")
-        logger.info("=" * 60)
         
         # Reload config file
         new_config = await config_obj.reload(config_path)
         
         # Update notify module
         notify_mod.reload_config(new_config)
-        
+
-        # Reload threshold checker
+        # Reload users
+        users_mod.load_users(new_config)
+
+        # Re-apply host attributes from updated config to all known hosts
+        from . import config as config_mod
+        dyndnshosts = config_mod.get_dyndnshosts(new_config)
+        watchhosts = config_mod.get_watchhosts(new_config)
+        for hostname, host in hbdclass.Host.hosts.items():
+            host.dyn = hostname in dyndnshosts
+            host.watched = hostname in watchhosts
+            access = config_mod.get_host_access(new_config, hostname)
+            host.apply_access(access["owner"], access["managers"], access["monitors"])
+
+        # Reload threshold checker and prune alerts orphaned by the new config
         if 'threshold_checker' in components:
             components['threshold_checker'].reload(new_config)
+            components['threshold_checker'].purge_stale_alerts(hbdclass)
         
         # Note: Changes to the following require restart:
         # - hb_port, hbd_port, ws_port (already bound)
@@ -85,13 +113,11 @@ async def reload_configuration(config_obj, config_path, components):
         # These are reloadable and effective immediately:
         # - notification_channels
         # - threshold_configs
-        # - hosts (watchhosts, dyndnshosts, notification_channels)
+        # - hosts (watchhosts, dyndns, notification_channels)
         # - grace period (used on next heartbeat)
         # - debug/verbose flags (used on next message)
         
-        logger.info("=" * 60)
         logger.info("Configuration reload completed successfully")
-        logger.info("=" * 60)
         return True
         
     except Exception as e:
@@ -103,6 +129,10 @@ async def reload_configuration(config_obj, config_path, components):
 
 
 async def _run_async(config, config_path=None):
+    from .config import ReloadableConfig
+    if not isinstance(config, ReloadableConfig):
+        config = ReloadableConfig(config, config_path)
+
     loop = asyncio.get_running_loop()
     shutdown_event = asyncio.Event()
     reload_event = asyncio.Event()
@@ -129,7 +159,7 @@ async def _run_async(config, config_path=None):
     from . import journal as journal_mod
     from . import threshold as threshold_mod
 
-    notify_mod.setup(config)
+    notify_mod.setup(config, loop=loop)
     
     # Initialize message journal
     msg_journal = journal_mod.get_journal(config)
@@ -160,30 +190,60 @@ async def _run_async(config, config_path=None):
             f"Warning: Could not reset IPV6_V6ONLY not supported or dual-stack is unavailable. Error: {e}"
         )
 
-    # 3. Bind to all interfaces (::) on a specific port
-
-    # UDP server endpoint (handler wired to handle_datagram with context)
     bind_addr = ("::", config.get("hb_port", 50003))
     sock.bind(bind_addr)
     logger.info("Starting UDP server on %s:%s", *bind_addr)
 
-    def udp_handler(msg, addr, transport):
+    # Try to enable kernel receive timestamps (Linux SO_TIMESTAMP).
+    # If supported, read datagrams via recvmsg() so RTT uses the kernel
+    # timestamp rather than the time.time() call after asyncio scheduling.
+    use_kernel_ts = udp.enable_kernel_timestamps(sock)
+    if use_kernel_ts:
+        logger.info("SO_TIMESTAMP enabled: using kernel receive timestamps for RTT")
+    else:
+        logger.info("SO_TIMESTAMP not available: using time.time() for RTT")
+
+    def udp_handler(msg, addr, transport, recv_ts=None):
         ctx = dict(
             config=config,
             hbdclass=hbdclass,
-            log=eventlog,
             msg_to_websockets=msg_to_websockets,
             msg_journal=msg_journal,
             threshold_checker=threshold_checker,
             DEBUG=config.get("debug", 0),
             verbose=config.get("verbose", False),
+            recv_ts=recv_ts,
         )
         udp.handle_datagram(msg, addr, transport, ctx)
 
-    transport, protocol = await loop.create_datagram_endpoint(
+    if use_kernel_ts:
-        lambda: udp.EchoServerProtocol(config=config, handler=udp_handler),
+        # recvmsg path: manage the socket ourselves with loop.add_reader()
-        sock=sock,
+        sock.setblocking(False)
+        transport = udp.RecvmsgTransport(loop, sock)
+        reader = udp.make_recvmsg_reader(sock, udp_handler, transport)
+        loop.add_reader(sock.fileno(), reader)
+        protocol = None
+    else:
+        transport, protocol = await loop.create_datagram_endpoint(
+            lambda: udp.EchoServerProtocol(config=config, handler=udp_handler),
+            sock=sock,
+        )
+
+    # Restore connection timers for hosts loaded from pickle
+    restore_ctx = dict(
+        config=config,
+        hbdclass=hbdclass,
+        msg_to_websockets=msg_to_websockets,
+        threshold_checker=threshold_checker,
     )
+    udp.restore_connection_timers(hbdclass, restore_ctx)
+
+    # Drop alert states that no longer have a matching threshold (stale after
+    # upgrade or config change between runs).
+    threshold_checker.purge_stale_alerts(hbdclass)
+
+    async def _http_reload_callback():
+        await reload_configuration(config, config_path, components)
 
     # HTTP server (asyncio-based via aiohttp)
     try:
@@ -194,9 +254,11 @@ async def _run_async(config, config_path=None):
                 config=config,
                 hbdclass=hbdclass,
                 tcss=None,
+                threshold_checker=threshold_checker,
                 verbose=config.get("verbose", False),
                 get_now=lambda: time.time(),
                 VER="",
+                reload_callback=_http_reload_callback,
             )
         )
         logger.info(
@@ -217,45 +279,30 @@ async def _run_async(config, config_path=None):
     except Exception as e:
         logger.exception("dns worker failed to start: %s", e)
 
-    # Start the websocket servers as a background task
+    # Register WebSocket state — connections are now served through /ws on the HTTP port
-    if config.get("wss_port", None):
+    ws_task = None
-        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
+    ws_mod.setup(
-        ssl_path = config.get("cert_path", "")
+        loop=loop,
-        wss_pem = ssl_path + config.get("wss_pem", "")
+        get_hosts=lambda: [
-        wss_key = ssl_path + config.get("wss_key", "")
+            hbdclass.Host.hosts[h].stateinfo()
-        try:
+            for h in sorted(hbdclass.Host.hosts)
-            ssl_context.load_cert_chain(wss_pem, keyfile=wss_key)
+        ],
-        except FileNotFoundError:
+        verbose=config.get("verbose", False),
-            logger.error("error: missing SSL keys %s or %s", wss_pem, wss_key)
+    )
-            sys.exit(1)
+    logger.info("WebSocket handler registered on /ws (HTTP port %s)", config.get("hbd_port", 50004))
-        logger.info(
-            "Starting secure WebSocket server on port %s with cert %s",
-            config.get("wss_port", None),
-            wss_pem,
-        )
-    else:
-        ssl_context = None
 
-    try:
+    # Periodic autosave task
-        ws_port = config.get("ws_port", 50005)
+    autosave_interval = config.get("autosave_interval", 300)  # default: 5 minutes
-        logger.info("Starting WebSocket server on port %s", ws_port)
+
-        ws_task = asyncio.create_task(
+    async def autosave_task():
-            ws_mod.start(
+        while True:
-                host=config.get("hbd_host", ""),
+            await asyncio.sleep(autosave_interval)
-                ws_port=ws_port,
+            logger.debug("Autosaving state...")
-                wss_port=config.get("wss_port", None),
+            save_state(config, hbdclass)
-                ssl_context=ssl_context,
+            logger.debug("Autosave complete (%d hosts)", len(hbdclass.Host.hosts))
-                get_hosts=lambda: [
+
-                    hbdclass.Host.hosts[h].stateinfo()
+    autosave = asyncio.create_task(autosave_task())
-                    for h in sorted(hbdclass.Host.hosts)
+    logger.info("Autosave task started (interval: %ds)", autosave_interval)
-                ],
-#                get_msgs=lambda: msgs,
-                config=config,
-            )
-        )
-        logger.info("WebSocket task started")
-    except Exception as e:
-        logger.exception("websocket server failed to start: %s", e)
 
     # Main event loop - monitor shutdown and reload events
     try:
@@ -304,7 +351,7 @@ async def _run_async(config, config_path=None):
         except Exception as e:
             logger.warning("Error closing UDP transport: %s", e)
 
-        tasks_to_cancel = [http_task, ws_task]
+        tasks_to_cancel = [http_task, autosave]
         for task in tasks_to_cancel:
             if task:
                 try:
@@ -355,6 +402,13 @@ async def _run_async(config, config_path=None):
         except Exception as e:
             logger.warning("Error stopping DNS worker: %s", e)
 
+        # Save state (hosts + sessions) on clean shutdown
+        try:
+            save_state(config, hbdclass)
+            logger.info("State saved on shutdown")
+        except Exception as e:
+            logger.warning("Error saving state on shutdown: %s", e)
+
         logger.info("All tasks cancelled")
 
 
@@ -363,11 +417,11 @@ def load_pickled_hosts(config, hbdclass):
     import os
     import pickle
     from . import config as config_mod
+    from . import users as users_mod
 
     pickfile = config.get("pickfile", "hbd.pickle")
     dyndnshosts = config_mod.get_dyndnshosts(config)
     watchhosts = config_mod.get_watchhosts(config)
-    drophosts = config.get("drophosts", [])
     if 1 and os.path.exists(pickfile):
         if config.get("verbose", False):
             logger.info("opening pickls %s", pickfile)
@@ -376,6 +430,10 @@ def load_pickled_hosts(config, hbdclass):
         try:
             hbdclass.Host.hosts = pick.load()
             data.msgs = pick.load()
+            try:
+                users_mod.load_sessions(pick.load())
+            except Exception:
+                pass  # older pickle without sessions — fine
             pickf.close()
         except Exception as e:
             logger.exception("load pickled failed: %s", e)
@@ -385,9 +443,10 @@ def load_pickled_hosts(config, hbdclass):
             hbdclass.Host.hosts[h].dyn = h in dyndnshosts
             hbdclass.Host.hosts[h].watched = h in watchhosts
             hbdclass.Host.hosts[h].fixup()
-        for h in drophosts:
+            access = config_mod.get_host_access(config, h)
-            if h in hbdclass.Host.hosts:
+            hbdclass.Host.hosts[h].apply_access(
-                del hbdclass.Host.hosts[h]
+                access["owner"], access["managers"], access["monitors"]
+            )
         if config.get("verbose", False):
             logger.info("%s pickled hosts loaded", len(hbdclass.Host.hosts))
     else:
@@ -406,12 +465,28 @@ def run(config, config_path=None):
     """
     import os
 
-    logging.basicConfig(
+    log_level = logging.WARNING
-        level=logging.DEBUG if config.get("debug", 0) > 0 else logging.INFO
+    if config.get("verbose", False):
-    )
+        log_level = logging.INFO
+    if config.get("debug", 0) > 0:
+        log_level = logging.DEBUG
+    logging.basicConfig(level=log_level)
+    if not config.get("debug", 0):
+        logging.getLogger("aiohttp.access").propagate = False
     load_pickled_hosts(config, hbdclass)
 
     notify_mod.initlog(logfile=config.get("logfile", "messages.log"))
+    users_mod.load_users(config)
+
+    # Write pidfile
+    pidfile = config.get("pidfile", "")
+    if pidfile:
+        try:
+            with open(pidfile, "w") as f:
+                f.write(str(os.getpid()))
+        except Exception as e:
+            logger.warning("Failed to write pidfile %s: %s", pidfile, e)
+
     eventlog(None, "INFO", f"hbd version {__version__} starting up")
     
     if config_path:
@@ -434,6 +509,12 @@ def run(config, config_path=None):
         logger.info("hbd shutdown complete")
         eventlog(None, "INFO", f"hbd version {__version__} shutdown")
         notify_mod.closelog()
+        # Remove pidfile
+        if pidfile:
+            try:
+                os.unlink(pidfile)
+            except Exception:
+                pass
         # Explicitly close the loop
         try:
             # Cancel all remaining tasks

hbd/server/notify.py

@@ -1,37 +1,100 @@
-"""Notification helpers: email, pushover, mattermost, signal and dispatcher."""
+"""Notification helpers: email, pushover, matrix, mattermost, signal, sms and dispatcher.
 
+Channel types supported:
+  pushover      - Pushover app notifications
+  email         - SMTP email
+  matrix        - Matrix (via matrix-nio)
+  mattermost    - Mattermost webhook
+  signal        - Signal via signal-cli subprocess
+  sms_voipms    - SMS via voip.ms REST API
+
+Each channel can specify ``min_level: WARNING|CRITICAL`` (default: WARNING).
+
+Notifications are dispatched to the owner + managers of the host, each via
+their own ``notification_channels`` list.  When no users are configured the
+server runs silently (no notifications sent).
+"""
+
+import asyncio
 import logging
-from typing import Optional
-import http.client
-import urllib.parse
-import subprocess
 import smtplib
+import subprocess
 import time
 import sys
+from dataclasses import dataclass, field
+from typing import Optional
+
 from . import data
 from . import ws as ws_mod
-from . import main as main_mod
 
-DEFAULT_PUSHPROVIDERS = ["all", "pushover", "mattermost", "signal"]
-msg_to_websockets = ws_mod.broadcast
-
-# module-level configuration set via setup()
-_config = {}
 logger = logging.getLogger(__name__)
 
+msg_to_websockets = ws_mod.broadcast
+
+# Module-level state set via setup()
+_config: dict = {}
+
+# Tracks which channels fired a WARNING/CRITICAL per host.
+# {host_name: set of channel_names}  — used to route RECOVER to the same channels.
+_alerted_channels: dict = {}
+
 logf = None
 
+
+# ---------------------------------------------------------------------------
+# Level ordering
+# ---------------------------------------------------------------------------
+
+_LEVEL_ORDER = {"RECOVER": 0, "INFO": 0, "WARNING": 1, "CRITICAL": 2}
+
+def _level_value(level: str) -> int:
+    return _LEVEL_ORDER.get(level.upper(), 0)
+
+
+# ---------------------------------------------------------------------------
+# Notification dataclass
+# ---------------------------------------------------------------------------
+
+@dataclass
+class Notification:
+    """Structured notification payload."""
+    title: str          # e.g. "[CRITICAL] webserver01"
+    body: str           # detail message
+    level: str          # RECOVER | WARNING | CRITICAL | INFO
+    url: str = ""       # link to plugin metrics page
+
+
+# ---------------------------------------------------------------------------
+# Module setup
+# ---------------------------------------------------------------------------
+
+def setup(cfg: dict, loop: Optional[asyncio.AbstractEventLoop] = None):
+    """Initialize notifier from configuration dict."""
+    global _config
+    _config = dict(cfg)
+
+
+def reload_config(cfg: dict):
+    """Reload notification configuration on SIGHUP."""
+    global _config
+    _config = dict(cfg)
+    logger.info("Notification configuration reloaded")
+
+
+# ---------------------------------------------------------------------------
+# Event log (websocket + file + in-memory)
+# ---------------------------------------------------------------------------
+
 def initlog(logfile):
     global logf
     try:
         logf = open(logfile, "a+")
     except Exception as e:
-        import sys
-
         print("cannot open logfile %s, using STDERR: %s" % (logfile, e))
         logf = sys.stderr
     return logf
 
+
 def closelog():
     global logf
     if logf and logf != sys.stderr:
@@ -40,13 +103,21 @@ def closelog():
         except Exception:
             pass
 
+
 def eventlog(host, lvl, m, service=None):
     ts = time.time()
+    msg = {
+        "ts": ts,
+        "host": host or None,
+        "level": lvl,
+        "service": service,
+        "message": m,
+    }
+    data.msgs.append(msg)
     s = f"{time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(ts))} {lvl} "
     if host:
         s += f"{host} "
     s += m
-    data.msgs.append(s)
     logger.info(s)
     if logf:
         try:
@@ -54,93 +125,35 @@ def eventlog(host, lvl, m, service=None):
             logf.flush()
         except Exception as e:
             logger.warning("failed to write to logfile: %s", e)
-    msg_to_websockets("message", s)
+    msg_to_websockets("message", msg)
-
-def setup(cfg: dict):
-    """Initialize notifier defaults from a configuration dict."""
-    global _config
-    _config = dict(cfg)
 
 
-def reload_config(cfg: dict):
+# ---------------------------------------------------------------------------
-    """Reload notification configuration.
+# Low-level channel drivers
-    
+# ---------------------------------------------------------------------------
-    This function updates the module-level notification configuration
-    during runtime config reloads.
-    
-    Args:
-        cfg: New configuration dictionary
-    """
-    global _config
-    _config = dict(cfg)
-    logger.info("Notification configuration reloaded")
 
-
+def _send_pushover(channel_cfg: dict, notif: Notification) -> bool:
-def send_email(toaddrs, smtpserver, sender, subject, body, debug=0):
+    import http.client
-    """Send a plain email via SMTP. Returns True on success."""
+    import urllib.parse
-    try:
+    token = channel_cfg.get("token", "")
-        smtpport = _config.get("smtpport", 587)
+    user = channel_cfg.get("user", "")
-        server = smtplib.SMTP(smtpserver, smtpport)
+    if not token or not user:
-        if debug > 0:
+        logger.warning("pushover: missing token or user")
-            server.set_debuglevel(1)
-        if smtpport == 587:
-            server.starttls()
-            server.ehlo()
-            smtpuser = _config.get("smtpuser", None)
-            smtppassword = _config.get("smtppassword", None)
-            if smtpuser and smtppassword:
-                server.login(smtpuser, smtppassword)
-        server.sendmail(sender, toaddrs, body)
-    except Exception as e:
-        logger.warning("email send failed: %s", e)
-        try:
-            server.quit()
-        except Exception:
-            pass
         return False
-    try:
+    body = "%s: %s" % (notif.title, notif.body)
-        server.quit()
+    title = ""
-    except Exception:
+    params: dict = {"token": token, "user": user, "title": title, "message": body}
-        pass
+    if channel_cfg.get("sound"):
-    return True
+        params["sound"] = channel_cfg["sound"]
-
+    if notif.url:
-
+        params["url"] = notif.url
-def email(subject: str, msg: str, debug: int = 0) -> bool:
+        params["url_title"] = "Heartbeat"
-    """Convenience wrapper exposed to the rest of the application.
-
-    Uses module-level configuration to supply recipient list, smtp server
-    and sender address.
-    """
-    toaddrs = _config.get("toemail")
-    fromemail = _config.get("fromemail")
-    smtpserver = _config.get("smtpserver")
-    if not toaddrs or not fromemail or not smtpserver:
-        logger.warning(
-            "email config incomplete: toemail=%s, fromemail=%s, smtpserver=%s",
-            toaddrs,
-            fromemail,
-            smtpserver,
-        )
-        return False
-    date = time.strftime("%a, %d %b %Y %H:%M:%S %z", time.localtime())
-    body = "To: %s\nFrom: %s\nSubject: %s\nDate: %s\n\n%s" % (
-        toaddrs[0] if toaddrs else "",
-        fromemail,
-        subject,
-        date,
-        msg,
-    )
-    return send_email(toaddrs, smtpserver, fromemail, subject, body, debug=debug)
-
-
-def pushover(token: str, user: str, msg: str, debug: int = 0) -> bool:
-    """Send message via Pushover API."""
     conn = http.client.HTTPSConnection("api.pushover.net:443")
     try:
         conn.request(
             "POST",
             "/1/messages.json",
-            urllib.parse.urlencode({"token": token, "user": user, "message": msg}),
+            urllib.parse.urlencode(params),
             {"Content-type": "application/x-www-form-urlencoded"},
         )
         r = conn.getresponse()
@@ -151,176 +164,334 @@ def pushover(token: str, user: str, msg: str, debug: int = 0) -> bool:
         return False
 
 
-def pushmattermost(
+def _send_email(channel_cfg: dict, notif: Notification) -> bool:
-    host: str,
+    recipients = channel_cfg.get("recipients", [])
-    token: str,
+    sender = channel_cfg.get("sender", "")
-    channel: str,
+    smtp_server = channel_cfg.get("smtp_server", "")
-    msg: str,
+    smtp_port = channel_cfg.get("smtp_port", 587)
-    username: str = "hbd",
+    smtp_user = channel_cfg.get("smtp_user")
-    icon: Optional[str] = None,
+    smtp_password = channel_cfg.get("smtp_password")
-    debug: int = 0,
-) -> bool:
-    """Send a message to Mattermost via simple webhook driver if available.
 
-    This helper tries to import mattermostdriver.Driver and uses webhooks if present.
+    if not recipients or not sender or not smtp_server:
-    If the import fails it returns False.
+        logger.warning("email: missing recipients, sender, or smtp_server")
-    """
+        return False
+
+    date = time.strftime("%a, %d %b %Y %H:%M:%S %z", time.localtime())
+    body_text = notif.body
+    if notif.url:
+        body_text += f"\n\n{notif.url}"
+    raw = "To: %s\nFrom: %s\nSubject: %s\nDate: %s\n\n%s" % (
+        recipients[0] if isinstance(recipients, list) else recipients,
+        sender,
+        notif.title,
+        date,
+        body_text,
+    )
+    try:
+        server = smtplib.SMTP(smtp_server, smtp_port)
+        if smtp_port == 587:
+            server.starttls()
+            server.ehlo()
+            if smtp_user and smtp_password:
+                server.login(smtp_user, smtp_password)
+        server.sendmail(sender, recipients, raw)
+        server.quit()
+        return True
+    except Exception as e:
+        logger.warning("email send failed: %s", e)
+        try:
+            server.quit()
+        except Exception:
+            pass
+        return False
+
+
+def _send_mattermost(channel_cfg: dict, notif: Notification) -> bool:
     try:
         from mattermostdriver import Driver
-    except Exception:
+    except ImportError:
+        logger.error("mattermostdriver not installed")
         return False
+    host = channel_cfg.get("host", "")
+    token = channel_cfg.get("token", "")
+    channel = channel_cfg.get("channel", "")
+    if not host or not token or not channel:
+        logger.warning("mattermost: missing host, token, or channel")
+        return False
+    text = f"**{notif.title}**\n{notif.body}"
+    if notif.url:
+        text += f"\n[Plugin metrics] {notif.url}"
     ses = {"url": host, "scheme": "http", "basepath": "/api/v4", "port": 8065}
     mm = Driver(ses)
-    payload = {"text": msg, "channel": channel, "username": username}
+    payload: dict = {"text": text, "channel": channel, "username": channel_cfg.get("username", "hbd")}
+    icon = channel_cfg.get("icon")
     if icon:
         payload["icon_url"] = icon
     try:
         rc = mm.webhooks.call_webhook(token, payload)
-        logger.debug("mattermost rc: %s", rc)
         return bool(rc is None or rc == "")
     except Exception as e:
         logger.error("mattermost error: %s", e)
         return False
 
 
-def pushsignal(
+def _send_signal(channel_cfg: dict, notif: Notification) -> bool:
-    signal_cli_bin: str, user: str, recipient: str, msg: str, debug: int = 0
+    cli = channel_cfg.get("cli_path", "/usr/local/bin/signal-cli")
-) -> bool:
+    user = channel_cfg.get("user", "")
-    """Send a message via signal-cli (requires local installation).
+    recipient = channel_cfg.get("recipient", "")
-
+    if not user or not recipient:
-    Uses subprocess to call signal-cli. Returns True if the command succeeded.
+        logger.warning("signal: missing user or recipient")
-    """
+        return False
-    CLI = [signal_cli_bin, "-u", user, "send", "-m", msg, recipient]
+    msg = f"{notif.title}\n{notif.body}"
-    logger.debug("signal cli: %s", CLI)
+    if notif.url:
+        msg += f"\n{notif.url}"
     try:
-        res = subprocess.run(CLI, capture_output=True)
+        res = subprocess.run([cli, "-u", user, "send", "-m", msg, recipient], capture_output=True)
         if res.returncode != 0:
-            logger.error("signal failed: %s".res.stderr.decode())
+            logger.error("signal failed: %s", res.stderr.decode())
             return False
-        logger.debug("signal sent: %s", res.stdout.decode())
         return True
     except Exception as e:
         logger.exception("signal exception: %s", e)
         return False
 
 
-def _dispatch_to_channel(channel_name: str, channel_config: dict, msg: str, debug: int = 0) -> bool:
+async def _send_sms_voipms_async(channel_cfg: dict, notif: Notification) -> bool:
-    """Dispatch a message to a specific notification channel.
+    """Send SMS via voip.ms REST API using multipart form-data POST."""
-    
+    import json
-    Args:
+    import aiohttp
-        channel_name: Name of the channel (for logging)
+
-        channel_config: Channel configuration dictionary with 'type' and type-specific fields
+    api_user = channel_cfg.get("api_user", "")
-        msg: Message to send
+    api_password = channel_cfg.get("api_password", "")
-        debug: Debug level
+    did = channel_cfg.get("did", "")
-        
+    dst = channel_cfg.get("dst", "")
-    Returns:
+    if not api_user or not api_password or not did or not dst:
-        True if notification sent successfully, False otherwise
+        logger.warning("sms_voipms: missing api_user, api_password, did, or dst")
-    """
+        return False
-    channel_type = channel_config.get("type")
+
-    
+    # SMS body: title + body, truncated to 160 chars
-    if channel_type == "pushover":
+    text = f"{notif.title}: {notif.body}"
-        return pushover(
+    if len(text) > 160:
-            channel_config.get("token", ""),
+        text = text[:157] + "..."
-            channel_config.get("user", ""),
+
-            msg,
+    form_data = {
-            debug=debug
+        "api_username": api_user,
-        )
+        "api_password": api_password,
-    
+        "method": "sendSMS",
-    elif channel_type == "email":
+        "did": did,
-        # Build email from channel config
+        "dst": dst,
-        recipients = channel_config.get("recipients", [])
+        "message": text,
-        sender = channel_config.get("sender", "")
+    }
-        smtp_server = channel_config.get("smtp_server", "")
+
-        smtp_port = channel_config.get("smtp_port", 587)
+    try:
-        smtp_user = channel_config.get("smtp_user")
+        async with aiohttp.ClientSession() as session:
-        smtp_password = channel_config.get("smtp_password")
+            with aiohttp.MultipartWriter("form-data") as mp:
-        
+                for key, value in form_data.items():
-        if not recipients or not sender or not smtp_server:
+                    part = mp.append(value)
-            logger.warning(
+                    part.set_content_disposition("form-data", name=key)
-                "Email channel '%s' missing required fields: recipients=%s, sender=%s, smtp_server=%s",
+            async with session.post("https://voip.ms/api/v1/rest.php", data=mp) as resp:
-                channel_name, recipients, sender, smtp_server
+                body = await resp.text()
-            )
+                if resp.status != 200:
-            return False
+                    logger.error("sms_voipms HTTP %s: %s", resp.status, body)
-        
+                    return False
-        # Temporarily update _config for email() function
+                result = json.loads(body)
-        old_config = dict(_config)
+                if result.get("status") == "success":
-        _config["toemail"] = recipients
+                    return True
-        _config["fromemail"] = sender
+                logger.error("sms_voipms error: %s", result.get("status"))
-        _config["smtpserver"] = smtp_server
+                return False
-        _config["smtpport"] = smtp_port
+    except Exception as e:
-        if smtp_user:
+        logger.error("sms_voipms exception: %s", e)
-            _config["smtpuser"] = smtp_user
-        if smtp_password:
-            _config["smtppassword"] = smtp_password
-        
-        result = email("Heartbeat notification", msg, debug=debug)
-        
-        # Restore config
-        _config.clear()
-        _config.update(old_config)
-        
-        return result
-    
-    elif channel_type == "signal":
-        return pushsignal(
-            channel_config.get("cli_path", "/usr/local/bin/signal-cli"),
-            channel_config.get("user", ""),
-            channel_config.get("recipient", ""),
-            msg,
-            debug=debug
-        )
-    
-    elif channel_type == "mattermost":
-        return pushmattermost(
-            channel_config.get("host", ""),
-            channel_config.get("token", ""),
-            channel_config.get("channel", ""),
-            msg,
-            username=channel_config.get("username", "hbd"),
-            icon=channel_config.get("icon"),
-            debug=debug
-        )
-    
-    else:
-        logger.warning("Unknown channel type '%s' for channel '%s'", channel_type, channel_name)
         return False
 
 
-def pushmsg_for_host(hostname: str, msg: str, debug: int = 0) -> dict:
+
-    """Send notification for a specific host using its configured channels.
+
-    
+async def _send_matrix_async(channel_cfg: dict, notif: Notification) -> bool:
-    This function looks up the host's notification channels from the config
+    """Send a Matrix message using matrix-nio."""
-    and sends the message to those channels.
+    try:
-    
+        from nio import AsyncClient, RoomMessageText  # noqa: F401
-    Args:
+    except ImportError:
-        hostname: Name of the host to send notification for
+        logger.error("matrix-nio not installed; pip install matrix-nio")
-        msg: Message to send
+        return False
-        debug: Debug level
+
-        
+    from nio import AsyncClient
-    Returns:
+    homeserver = channel_cfg.get("homeserver", "")
-        Dictionary of results per channel: {"channel_name": True/False}
+    access_token = channel_cfg.get("access_token", "")
+    room_id = channel_cfg.get("room_id", "")
+    if not homeserver or not access_token or not room_id:
+        logger.warning("matrix: missing homeserver, access_token, or room_id")
+        return False
+
+    text = f"{notif.title}\n{notif.body}"
+    if notif.url:
+        text += f"\n{notif.url}"
+    html = f"<strong>{notif.title}</strong><br>{notif.body}"
+    if notif.url:
+        html += f'<br><a href="{notif.url}">Plugin metrics</a>'
+
+    client = AsyncClient(homeserver)
+    client.access_token = access_token
+    try:
+        from nio import RoomSendResponse
+        content = {
+            "msgtype": "m.text",
+            "body": text,
+            "format": "org.matrix.custom.html",
+            "formatted_body": html,
+        }
+        resp = await client.room_send(room_id, "m.room.message", content)
+        if hasattr(resp, "event_id"):
+            return True
+        logger.error("matrix send failed: %s", resp)
+        return False
+    except Exception as e:
+        logger.error("matrix exception: %s", e)
+        return False
+    finally:
+        await client.close()
+
+
+# ---------------------------------------------------------------------------
+# Channel dispatcher  (all async — sync drivers run in a thread executor)
+# ---------------------------------------------------------------------------
+
+# Sync drivers kept for `hbd notify` CLI usage (asyncio.run wraps them there).
+_DRIVERS = {
+    "pushover": _send_pushover,
+    "email": _send_email,
+    "mattermost": _send_mattermost,
+    "signal": _send_signal,
+}
+
+_TIMEOUT = 15  # seconds per channel send
+
+
+async def _dispatch_to_channel(channel_name: str, channel_cfg: dict, notif: Notification) -> bool:
+    """Send *notif* to a single named channel, honouring min_level."""
+    # Strip ownership metadata — notifier drivers only need delivery credentials.
+    channel_cfg = {k: v for k, v in channel_cfg.items() if k not in ("owner", "private")}
+
+    level = notif.level.upper()
+    if level != "RECOVER":
+        min_level = channel_cfg.get("min_level", "WARNING").upper()
+        if _level_value(level) < _level_value(min_level):
+            logger.debug(
+                "channel '%s': skipping level %s (min_level=%s)", channel_name, level, min_level
+            )
+            return True  # filtered intentionally
+
+    ch_type = channel_cfg.get("type", "")
+    try:
+        if ch_type == "matrix":
+            return await asyncio.wait_for(_send_matrix_async(channel_cfg, notif), timeout=_TIMEOUT)
+        if ch_type == "sms_voipms":
+            return await asyncio.wait_for(_send_sms_voipms_async(channel_cfg, notif), timeout=_TIMEOUT)
+        sync_driver = _DRIVERS.get(ch_type)
+        if sync_driver is None:
+            logger.warning("unknown channel type '%s' for channel '%s'", ch_type, channel_name)
+            return False
+        return await asyncio.wait_for(
+            asyncio.to_thread(sync_driver, channel_cfg, notif), timeout=_TIMEOUT
+        )
+    except asyncio.TimeoutError:
+        logger.error("channel '%s' timed out after %ds", channel_name, _TIMEOUT)
+        return False
+
+
+# ---------------------------------------------------------------------------
+# Central dispatch function
+# ---------------------------------------------------------------------------
+
+def _build_url(host_name: str) -> str:
+    base_url = _config.get("base_url", "").rstrip("/")
+    if not base_url:
+        return ""
+    return f"{base_url}/alerts?filter={host_name}"
+
+
+async def send_notification(host_name: str, notif: Notification) -> dict:
+    """Dispatch *notif* to all managers/owner of *host_name*.
+
+    Looks up the host's owner + managers, resolves each user's
+    notification_channels, and dispatches.  Silently does nothing if
+    no users are configured.
+
+    Returns a dict of {channel_name: bool} results.
     """
-    from . import config as config_mod
+    from . import users as users_mod
-    
+    from . import hbdclass
-    # Get notification channels for this host
+
-    channels = config_mod.get_notification_channels_config(_config, hostname)
+    if not users_mod.users_enabled():
-    
-    if not channels:
-        logger.warning("No notification channels configured for host '%s'", hostname)
         return {}
-    
+
-    # Dispatch to each channel
+    # Collect recipient usernames: owner + managers
-    results = {}
+    host = hbdclass.Host.hosts.get(host_name)
-    for channel_name, channel_config in channels:
+    if host is None:
-        try:
+        logger.debug("send_notification: host '%s' not found", host_name)
-            success = _dispatch_to_channel(channel_name, channel_config, msg, debug=debug)
+        return {}
-            results[channel_name] = success
+
-            if success:
+    recipients: set[str] = set()
-                logger.info("Notification sent to channel '%s': %s", channel_name, msg)
+    owner = getattr(host, "owner", None)
-            else:
+    if owner:
-                logger.warning("Failed to send notification to channel '%s'", channel_name)
+        recipients.add(owner)
-        except Exception as e:
+    for m in getattr(host, "managers", []):
-            logger.error("Error sending to channel '%s': %s", channel_name, e)
+        recipients.add(m)
-            results[channel_name] = False
+
-    
+    if not recipients:
+        logger.debug("send_notification: no owner/managers for '%s'", host_name)
+        return {}
+
+    # Fill url if not already set
+    if not notif.url:
+        notif.url = _build_url(host_name)
+
+    global_channels: dict = _config.get("notification_channels", {})
+    results: dict = {}
+    level = notif.level.upper()
+    is_alert = level in ("WARNING", "CRITICAL")
+    is_recover = level in ("RECOVER",)
+
+    # For RECOVER: send to every channel that previously fired an alert for this host,
+    # regardless of that channel's min_level.
+    if is_recover and host_name in _alerted_channels:
+        for channel_name in list(_alerted_channels[host_name]):
+            channel_cfg = global_channels.get(channel_name)
+            if not channel_cfg:
+                continue
+            try:
+                ok = await _dispatch_to_channel(channel_name, channel_cfg, notif)
+                results[channel_name] = ok
+                if ok:
+                    logger.info("recover sent to channel '%s': %s", channel_name, notif.title)
+            except Exception as e:
+                logger.error("error sending recover to channel '%s': %s", channel_name, e)
+        del _alerted_channels[host_name]
+        return results
+
+    for username in recipients:
+        user = users_mod.get_user(username)
+        if user is None:
+            logger.debug("send_notification: user '%s' not found", username)
+            continue
+        for channel_name in user.notification_channels:
+            if channel_name in results:
+                continue
+            channel_cfg = global_channels.get(channel_name)
+            if not channel_cfg:
+                logger.warning("channel '%s' not defined in notification_channels", channel_name)
+                results[channel_name] = False
+                continue
+            try:
+                ok = await _dispatch_to_channel(channel_name, channel_cfg, notif)
+                results[channel_name] = ok
+                if ok:
+                    logger.info("notification sent to channel '%s': %s", channel_name, notif.title)
+                    if is_alert:
+                        _alerted_channels.setdefault(host_name, set()).add(channel_name)
+                else:
+                    logger.warning("failed to send notification to channel '%s'", channel_name)
+            except Exception as e:
+                logger.error("error sending to channel '%s': %s", channel_name, e)
+                results[channel_name] = False
+
     return results

hbd/server/oauth.py

@@ -0,0 +1,254 @@
+"""OAuth2 provider support.
+
+Config shape (in ~/.hb.yaml):
+
+    oauth:
+      my-gitea:                          # route slug → /login/oauth/my-gitea
+        type: gitea                      # "gitea" | "github" | "nextcloud"
+                                         # omit type to default to "gitea"
+        url: https://git.example.com     # required for gitea and nextcloud
+        client_id: <client-id>
+        client_secret: <client-secret>
+        label: "Work Gitea"              # optional display name on login button
+        logo: https://example.com/logo.png  # optional logo URL
+
+      github:
+        type: github
+        client_id: <client-id>
+        client_secret: <client-secret>
+
+      nextcloud:
+        type: nextcloud
+        url: https://cloud.example.com
+        client_id: <client-id>
+        client_secret: <client-secret>
+
+Register the OAuth app with each provider and set the redirect URI to:
+  https://<hbd-host>/login/oauth/<name>/callback
+"""
+
+import logging
+import secrets
+import time
+import urllib.parse
+from dataclasses import dataclass
+
+import aiohttp
+
+logger = logging.getLogger(__name__)
+
+STATE_TTL = 600  # 10 minutes
+
+# state_token -> expiry timestamp
+_states: dict[str, float] = {}
+
+
+def make_state() -> str:
+    """Generate a CSRF state token, store it with TTL, and return it."""
+    _purge_states()
+    token = secrets.token_hex(32)
+    _states[token] = time.time() + STATE_TTL
+    return token
+
+
+def validate_state(state: str) -> bool:
+    """Return True if *state* is known and unexpired; always removes it."""
+    expiry = _states.pop(state, None)
+    if expiry is None:
+        return False
+    return time.time() < expiry
+
+
+def _purge_states() -> None:
+    """Remove all expired CSRF state tokens from the in-memory store."""
+    now = time.time()
+    expired = [k for k, exp in list(_states.items()) if exp < now]
+    for k in expired:
+        del _states[k]
+
+
+class OAuthError(Exception):
+    """Raised when the OAuth2 flow fails for any reason."""
+
+
+PROVIDER_DEFS: dict = {
+    "gitea": {
+        "authorize_url_tmpl": "{url}/login/oauth/authorize",
+        "token_url_tmpl":     "{url}/login/oauth/access_token",
+        "profile_url_tmpl":   "{url}/api/v1/user",
+        "scope":              "user:email",
+        "field_map":          {"username": "login", "full_name": "full_name", "avatar": "avatar_url"},
+        "profile_data_path":  [],
+        "requires_url":       True,
+        "default_label":      "Gitea",
+    },
+    "github": {
+        "authorize_url_tmpl": "https://github.com/login/oauth/authorize",
+        "token_url_tmpl":     "https://github.com/login/oauth/access_token",
+        "profile_url_tmpl":   "https://api.github.com/user",
+        "scope":              "read:user",
+        "field_map":          {"username": "login", "full_name": "name", "avatar": "avatar_url"},
+        "profile_data_path":  [],
+        "requires_url":       False,
+        "default_label":      "GitHub",
+    },
+    "nextcloud": {
+        "authorize_url_tmpl": "{url}/apps/oauth2/authorize",
+        "token_url_tmpl":     "{url}/apps/oauth2/api/v1/token",
+        "profile_url_tmpl":   "{url}/ocs/v2.php/cloud/user?format=json",
+        "scope":              "",
+        "field_map":          {"username": "id", "full_name": "display-name", "avatar": None},
+        "profile_data_path":  ["ocs", "data"],
+        "requires_url":       True,
+        "default_label":      "Nextcloud",
+    },
+}
+
+
+@dataclass
+class ResolvedProvider:
+    """A fully resolved OAuth2 provider instance, ready to use."""
+    name: str
+    type: str
+    label: str
+    logo: str
+    authorize_url: str
+    token_url: str
+    profile_url: str
+    scope: str
+    client_id: str
+    client_secret: str
+    field_map: dict
+    profile_data_path: list
+
+
+def get_providers(config: dict) -> list[ResolvedProvider]:
+    """Return a ResolvedProvider for every valid entry in config['oauth'].
+
+    Entries with missing required fields or unknown types are skipped with
+    a warning log.  Order follows config declaration order.
+    """
+    result = []
+    oauth_cfg = config.get("oauth", {})
+    if not isinstance(oauth_cfg, dict):
+        return result
+    for name, entry in oauth_cfg.items():
+        if not isinstance(entry, dict):
+            continue
+        provider_type = entry.get("type", "gitea")
+        defn = PROVIDER_DEFS.get(provider_type)
+        if defn is None:
+            logger.warning("OAuth: unknown provider type %r for %r, skipping", provider_type, name)
+            continue
+        client_id = entry.get("client_id", "")
+        client_secret = entry.get("client_secret", "")
+        if not client_id or not client_secret:
+            logger.warning("OAuth: %r missing client_id or client_secret, skipping", name)
+            continue
+        url = entry.get("url", "").rstrip("/")
+        if defn["requires_url"] and not url:
+            logger.warning("OAuth: %r requires url but none configured, skipping", name)
+            continue
+        label = entry.get("label") or defn["default_label"]
+        logo = entry.get("logo", "")
+        result.append(ResolvedProvider(
+            name=name,
+            type=provider_type,
+            label=label,
+            logo=logo,
+            authorize_url=defn["authorize_url_tmpl"].format(url=url),
+            token_url=defn["token_url_tmpl"].format(url=url),
+            profile_url=defn["profile_url_tmpl"].format(url=url),
+            scope=defn["scope"],
+            client_id=client_id,
+            client_secret=client_secret,
+            field_map=dict(defn["field_map"]),
+            profile_data_path=list(defn["profile_data_path"]),
+        ))
+    return result
+
+
+def is_enabled(config: dict) -> bool:
+    """Return True when at least one OAuth provider is fully configured."""
+    return bool(get_providers(config))
+
+
+def build_auth_url(provider: ResolvedProvider, state: str, redirect_uri: str) -> str:
+    """Return the provider's OAuth2 authorization URL to redirect the browser to."""
+    params: dict = {
+        "client_id": provider.client_id,
+        "redirect_uri": redirect_uri,
+        "response_type": "code",
+        "state": state,
+    }
+    if provider.scope:
+        params["scope"] = provider.scope
+    return f"{provider.authorize_url}?{urllib.parse.urlencode(params)}"
+
+
+async def exchange_code(provider: ResolvedProvider, code: str, redirect_uri: str) -> str:
+    """Exchange an authorization *code* for an access token.
+
+    Returns the access token string.  Raises OAuthError on any failure.
+    """
+    payload = {
+        "client_id": provider.client_id,
+        "client_secret": provider.client_secret,
+        "code": code,
+        "grant_type": "authorization_code",
+        "redirect_uri": redirect_uri,
+    }
+    timeout = aiohttp.ClientTimeout(total=10)
+    try:
+        async with aiohttp.ClientSession(timeout=timeout) as session:
+            async with session.post(
+                provider.token_url,
+                json=payload,
+                headers={"Accept": "application/json"},
+            ) as resp:
+                if resp.status != 200:
+                    text = await resp.text()
+                    raise OAuthError(f"Token exchange failed ({resp.status}): {text}")
+                data = await resp.json()
+                token = data.get("access_token")
+                if not token:
+                    raise OAuthError(f"No access_token in response: {data}")
+    except aiohttp.ClientError as exc:
+        raise OAuthError(f"Token exchange network error: {exc}") from exc
+    return token
+
+
+async def fetch_user(provider: ResolvedProvider, token: str) -> dict:
+    """Fetch the authenticated user's profile from the provider.
+
+    Returns a dict with keys: login, full_name, avatar_url.
+    Raises OAuthError on any failure.
+    """
+    timeout = aiohttp.ClientTimeout(total=10)
+    try:
+        async with aiohttp.ClientSession(timeout=timeout) as session:
+            async with session.get(
+                provider.profile_url,
+                headers={
+                    "Authorization": f"Bearer {token}",
+                    "Accept": "application/json",
+                },
+            ) as resp:
+                if resp.status != 200:
+                    text = await resp.text()
+                    raise OAuthError(f"User fetch failed ({resp.status}): {text}")
+                data = await resp.json()
+    except aiohttp.ClientError as exc:
+        raise OAuthError(f"User fetch network error: {exc}") from exc
+
+    try:
+        for key in provider.profile_data_path:
+            data = data.get(key, {})
+        avatar_field = provider.field_map.get("avatar")
+        return {
+            "login":      data.get(provider.field_map["username"], ""),
+            "full_name":  data.get(provider.field_map["full_name"], ""),
+            "avatar_url": data.get(avatar_field, "") if avatar_field else "",
+        }
+    except AttributeError:
+        raise OAuthError(f"Unexpected profile response structure from {provider.type}")

hbd/server/settings.py

@@ -0,0 +1,498 @@
+"""Settings descriptor: maps config keys to display metadata.
+
+``get_settings_sections(config)`` returns an ordered list of sections, each
+containing a list of field descriptors.  The template iterates this structure
+generically, so adding editability later is a matter of:
+
+  1. Setting ``"editable": True`` on a field.
+  2. Adding the matching ``<input>``/``<select>`` in the template
+     (guided by ``"type"``).
+  3. Wiring a POST handler in http.py.
+
+Field descriptor keys
+---------------------
+key         str   Config key (for future form POST matching)
+label       str   Human-readable label
+description str   One-line help text shown below the value
+value       any   Sanitized display value (secrets replaced with "•••")
+type        str   One of: text | number | port | boolean | path | duration |
+                  list | secret | size | select
+editable    bool  Reserved for future use — currently always False
+sensitive   bool  True when the raw value must never be shown
+"""
+
+# Credential field names that should always be masked.
+_SECRET_KEYS = frozenset({
+    "password", "token", "user_key", "api_key", "secret",
+    "smtp_password", "smtp_user", "api_password", "access_token",
+})
+
+CHANNEL_TYPE_SCHEMAS = {
+    "pushover": {
+        "label": "Pushover",
+        "fields": [
+            {"key": "token",  "label": "App token",  "type": "secret", "required": True},
+            {"key": "user",   "label": "User key",   "type": "secret", "required": True},
+            {"key": "sound",  "label": "Sound",      "type": "text",   "required": False},
+        ],
+    },
+    "email": {
+        "label": "E-mail",
+        "fields": [
+            {"key": "recipients",    "label": "Recipients (comma-separated)", "type": "list",   "required": True},
+            {"key": "sender",        "label": "From address",                 "type": "text",   "required": True},
+            {"key": "smtp_server",   "label": "SMTP server",                  "type": "text",   "required": True},
+            {"key": "smtp_port",     "label": "SMTP port",                    "type": "port",   "required": False},
+            {"key": "smtp_user",     "label": "SMTP username",                "type": "text",   "required": False},
+            {"key": "smtp_password", "label": "SMTP password",                "type": "secret", "required": False},
+        ],
+    },
+    "signal": {
+        "label": "Signal",
+        "fields": [
+            {"key": "user",      "label": "Sender number",    "type": "text", "required": True},
+            {"key": "recipient", "label": "Recipient number", "type": "text", "required": True},
+            {"key": "cli_path",  "label": "signal-cli path",  "type": "text", "required": False},
+        ],
+    },
+    "matrix": {
+        "label": "Matrix",
+        "fields": [
+            {"key": "homeserver",   "label": "Homeserver URL", "type": "text",   "required": True},
+            {"key": "access_token", "label": "Access token",   "type": "secret", "required": True},
+            {"key": "room_id",      "label": "Room ID",        "type": "text",   "required": True},
+        ],
+    },
+    "sms_voipms": {
+        "label": "SMS (voip.ms)",
+        "fields": [
+            {"key": "api_user",     "label": "API username", "type": "text",   "required": True},
+            {"key": "api_password", "label": "API password", "type": "secret", "required": True},
+            {"key": "did",          "label": "DID (from)",   "type": "text",   "required": True},
+            {"key": "dst",          "label": "Destination",  "type": "text",   "required": True},
+        ],
+    },
+    "mattermost": {
+        "label": "Mattermost",
+        "fields": [
+            {"key": "host",     "label": "Host",          "type": "text",   "required": True},
+            {"key": "token",    "label": "Webhook token", "type": "secret", "required": True},
+            {"key": "channel",  "label": "Channel",       "type": "text",   "required": True},
+            {"key": "username", "label": "Bot username",  "type": "text",   "required": False},
+            {"key": "icon",     "label": "Icon URL",      "type": "text",   "required": False},
+        ],
+    },
+}
+
+_CHANNEL_TYPE_LABELS = {k: v["label"] for k, v in CHANNEL_TYPE_SCHEMAS.items()}
+
+
+def _mask(value):
+    """Return a masked placeholder for sensitive values."""
+    if not value:
+        return ""
+    return "•••"
+
+
+def _fmt_size(n):
+    """Format a byte count as a human-readable string."""
+    try:
+        n = int(n)
+    except (TypeError, ValueError):
+        return str(n)
+    for unit in ("B", "KB", "MB", "GB"):
+        if n < 1024:
+            return f"{n} {unit}"
+        n //= 1024
+    return f"{n} TB"
+
+
+def _fmt_duration(seconds):
+    """Format seconds into a human-readable duration string."""
+    try:
+        s = int(seconds)
+    except (TypeError, ValueError):
+        return str(seconds)
+    if s < 60:
+        return f"{s}s"
+    if s < 3600:
+        m, sec = divmod(s, 60)
+        return f"{m}m {sec}s" if sec else f"{m}m"
+    h, rem = divmod(s, 3600)
+    m = rem // 60
+    return f"{h}h {m}m" if m else f"{h}h"
+
+
+def _sanitize_channel(name, cfg):
+    """Return a sanitized copy of a notification channel config."""
+    result = {}
+    for k, v in cfg.items():
+        if k in _SECRET_KEYS:
+            result[k] = _mask(v)
+        elif isinstance(v, list):
+            result[k] = v
+        else:
+            result[k] = v
+    return result
+
+
+# ---------------------------------------------------------------------------
+# Public API
+# ---------------------------------------------------------------------------
+
+def get_settings_sections(config: dict, threshold_checker=None) -> list:
+    """Return ordered list of setting sections for the settings page.
+
+    Each section:
+        {
+            "title": str,
+            "description": str,
+            "fields": [ field_descriptor, ... ]
+        }
+
+    Each field_descriptor:
+        {
+            "key":         str,
+            "label":       str,
+            "description": str,
+            "value":       display_value,
+            "raw":         raw_config_value,   # None for sensitive
+            "type":        str,
+            "editable":    bool,
+            "sensitive":   bool,
+        }
+    """
+    def field(key, label, ftype, description="", editable=False, sensitive=False):
+        raw = config.get(key)
+        if sensitive:
+            display = _mask(raw)
+            raw_out = None
+        elif ftype == "size":
+            display = _fmt_size(raw)
+            raw_out = raw
+        elif ftype == "duration":
+            display = _fmt_duration(raw)
+            raw_out = raw
+        elif ftype == "boolean":
+            display = bool(raw)
+            raw_out = raw
+        elif ftype == "list":
+            val = raw or []
+            display = list(val) if not isinstance(val, list) else val
+            raw_out = display
+        else:
+            display = raw if raw is not None else ""
+            raw_out = raw
+        return {
+            "key": key,
+            "label": label,
+            "description": description,
+            "value": display,
+            "raw": raw_out,
+            "type": ftype,
+            "editable": editable,
+            "sensitive": sensitive,
+        }
+
+    # ---- Notification channels (complex, built separately) ----------------
+    _METADATA_KEYS = {"type", "owner", "private", "min_level"}
+    notif_channels = []
+    for ch_name, ch_cfg in sorted((config.get("notification_channels") or {}).items()):
+        if not isinstance(ch_cfg, dict):
+            continue
+        ch_type = ch_cfg.get("type", "")
+        fields = []
+        for k, v in ch_cfg.items():
+            if k in _METADATA_KEYS:
+                continue
+            sensitive = k in _SECRET_KEYS
+            fields.append({
+                "key": k,
+                "label": k.replace("_", " ").title(),
+                "value": _mask(v) if sensitive else (
+                    ", ".join(v) if isinstance(v, list) else str(v)
+                ),
+                "sensitive": sensitive,
+            })
+        notif_channels.append({
+            "name": ch_name,
+            "type": ch_type,
+            "type_label": _CHANNEL_TYPE_LABELS.get(ch_type, ch_type.title()),
+            "owner": ch_cfg.get("owner"),
+            "private": bool(ch_cfg.get("private", False)),
+            "min_level": ch_cfg.get("min_level", "WARNING"),
+            "fields": fields,
+        })
+
+    # ---- Users (show metadata only, never password hashes) ----------------
+    users_list = []
+    for username, attrs in (config.get("users") or {}).items():
+        if not isinstance(attrs, dict):
+            continue
+        users_list.append({
+            "username": username,
+            "full_name": attrs.get("full_name", ""),
+            "admin": bool(attrs.get("admin", False)),
+            "avatar": attrs.get("avatar", ""),
+            "notification_channels": attrs.get("notification_channels", []),
+        })
+
+    # ---- Threshold configurations -----------------------------------------
+    def _tc_to_row(tc):
+        return {
+            "metric": tc.metric_path,
+            "operator": tc.operator.value,
+            "warning": tc.warning,
+            "critical": tc.critical,
+            "hysteresis": tc.hysteresis,
+            "count": tc.count,
+            "enabled": tc.enabled,
+            "display": tc.display or "",
+            "grace": tc.grace,
+        }
+
+    threshold_config_list = []
+    if threshold_checker is not None:
+        if threshold_checker.threshold_configs:
+            for cfg_name, cfg_metrics in sorted(threshold_checker.threshold_configs.items()):
+                # For the default config use the merged effective set;
+                # for named overrides use only the explicitly defined metrics
+                # (threshold_raw_configs) so inherited defaults are not repeated.
+                if cfg_name == "default":
+                    display_metrics = cfg_metrics
+                else:
+                    display_metrics = threshold_checker.threshold_raw_configs.get(cfg_name, cfg_metrics)
+                metrics = sorted(
+                    [_tc_to_row(tc) for tc in display_metrics.values()],
+                    key=lambda m: m["metric"],
+                )
+                threshold_config_list.append({"name": cfg_name, "metrics": metrics})
+        elif threshold_checker.thresholds:
+            metrics = sorted(
+                [_tc_to_row(tc) for tc in threshold_checker.thresholds.values()],
+                key=lambda m: m["metric"],
+            )
+            threshold_config_list.append({"name": "default", "metrics": metrics})
+
+    # ---- Hosts summary ----------------------------------------------------
+    hosts_list = []
+    for hname, hcfg in sorted((config.get("hosts") or {}).items()):
+        if not isinstance(hcfg, dict):
+            continue
+        hosts_list.append({
+            "name": hname,
+            "watch": bool(hcfg.get("watch", True)),
+            "dyndns": bool(hcfg.get("dyndns", False)),
+            "owner": hcfg.get("owner", ""),
+            "managers": hcfg.get("managers", []),
+            "monitors": hcfg.get("monitors", []),
+            "threshold_configs": (
+                list(v) if isinstance(v := hcfg.get("threshold_config"), list)
+                else ([v] if v else [])
+            ),
+            "notification_channels": hcfg.get("notification_channels", []),
+        })
+
+    # ---- OAuth providers -------------------------------------------------------
+    oauth_providers = []
+    for pname, pattrs in (config.get("oauth") or {}).items():
+        if not isinstance(pattrs, dict):
+            continue
+        cs = pattrs.get("client_secret", "")
+        oauth_providers.append({
+            "name": pname,
+            "type": pattrs.get("type", "gitea"),
+            "url": pattrs.get("url", ""),
+            "client_id": pattrs.get("client_id", ""),
+            "client_secret": "•••" if cs else "",
+            "label": pattrs.get("label", ""),
+            "logo": pattrs.get("logo", ""),
+        })
+
+    return [
+        {
+            "id": "network",
+            "title": "Network",
+            "description": "Ports and bind addresses for all server sockets.",
+            "section_mode": "form",
+            "api_section": "server",
+            "fields": [
+                field("hb_port",  "Heartbeat UDP port",  "port",
+                      "UDP port the server listens on for heartbeat datagrams.", editable=True),
+                field("hbd_host", "HTTP bind address",   "text",
+                      "Interface to bind the HTTP server to. Empty = all interfaces.", editable=True),
+                field("hbd_port", "HTTP API port",       "port",
+                      "TCP port for the HTTP API and web UI.", editable=True),
+                field("ws_port",  "WebSocket port",      "port",
+                      "TCP port for the plain WebSocket server.", editable=True),
+                field("wss_port", "Secure WebSocket port", "port",
+                      "TCP port for WSS (TLS WebSocket). Leave empty to disable.", editable=True),
+            ],
+        },
+        {
+            "id": "tls",
+            "title": "TLS / WebSocket Security",
+            "description": "Certificate paths used when wss_port is set.",
+            "section_mode": "form",
+            "api_section": None,
+            "fields": [
+                field("cert_path", "Certificate directory", "path",
+                      "Directory containing the TLS certificate and key files."),
+                field("wss_pem",   "Certificate file",     "text",
+                      "Filename of the TLS certificate chain (PEM format)."),
+                field("wss_key",   "Key file",             "text",
+                      "Filename of the TLS private key (PEM format)."),
+            ],
+        },
+        {
+            "id": "monitoring",
+            "title": "Monitoring",
+            "description": "Heartbeat timing and alert re-notification behaviour.",
+            "section_mode": "form",
+            "api_section": "server",
+            "fields": [
+                field("interval",  "Heartbeat interval", "duration",
+                      "Expected time between heartbeat messages from each client.", editable=True),
+                field("grace",     "Grace period",        "number",
+                      "Extra seconds to wait after a missed heartbeat before sending notifications.", editable=True),
+                field("threshold_renotify_interval", "Re-notify interval", "duration",
+                      "How often to re-send notifications for ongoing threshold alerts.", editable=True),
+                field("autosave_interval", "Autosave interval", "duration",
+                      "How often the server saves its state to disk."),
+                field("base_url", "Base URL", "text",
+                      "Base URL for notification links.", editable=True),
+            ],
+        },
+        {
+            "id": "persistence",
+            "title": "Persistence & Logging",
+            "description": "State file and event log settings.",
+            "section_mode": "form",
+            "api_section": "server",
+            "fields": [
+                field("pickfile", "State file",   "path",
+                      "Path to the pickle file used to persist host state across restarts.", editable=True),
+                field("logfile",  "Event log",    "path",
+                      "Path to the event log file.", editable=True),
+            ],
+        },
+        {
+            "id": "journal",
+            "title": "Message Journal",
+            "description": "All received heartbeat and plugin messages are journalled here.",
+            "section_mode": "form",
+            "api_section": "server",
+            "fields": [
+                field("journal_enabled",     "Enabled",          "boolean",
+                      "Turn journalling on or off.", editable=True),
+                field("journal_dir",         "Journal directory","path",
+                      "Directory where journal files are written.", editable=True),
+                field("journal_file",        "Journal filename", "text",
+                      "Base filename for the journal (rotated copies get a numeric suffix)."),
+                field("journal_max_size",    "Max file size",    "size",
+                      "Rotate the journal when it exceeds this size.", editable=True),
+                field("journal_max_backups", "Backup count",     "number",
+                      "Number of rotated journal files to keep.", editable=True),
+            ],
+        },
+        {
+            "id": "dns",
+            "title": "Dynamic DNS",
+            "description": "nsupdate-based DNS registration via nsupdate(8).",
+            "section_mode": "form",
+            "api_section": "dns",
+            "fields": [
+                field("nsupdate_bin", "nsupdate binary", "path",
+                      "Path to the nsupdate binary.", editable=True),
+                field("rndc_key", "RNDC key file", "path",
+                      "Path to the rndc key file used to authenticate DNS updates.", editable=True),
+                field("dyndomains", "Dynamic domains", "list",
+                      "Domains updated via nsupdate when a host with dyndns: true reports in.",
+                      editable=True),
+            ],
+        },
+        {
+            "id": "users",
+            "title": "Users",
+            "description": "Accounts defined in the config file. Password hashes are never shown.",
+            "section_mode": "form",
+            "api_section": "users",
+            "users": users_list,
+            "fields": [
+                field("default_owner", "Default owner", "text",
+                      "Username that owns hosts with no explicit owner. "
+                      "Falls back to the first admin user.", editable=True),
+            ],
+        },
+        {
+            "id": "oauth",
+            "title": "OAuth Providers",
+            "description": "OAuth2 login providers. Client secrets are masked.",
+            "section_mode": "form",
+            "api_section": "oauth",
+            "providers": oauth_providers,
+            "fields": [],
+        },
+        {
+            "id": "channels",
+            "title": "Notification Channels",
+            "description": "Named notification providers. Credentials are masked.",
+            "section_mode": "channels",
+            "api_section": "notification_channels",
+            "channels": notif_channels,
+            "fields": [
+                field("default_notification_channels", "Default channels", "list",
+                      "Channels used when a host does not specify its own."),
+            ],
+        },
+        {
+            "id": "hosts",
+            "title": "Hosts",
+            "description": "Host definitions loaded from the config file.",
+            "section_mode": "hosts",
+            "api_section": "hosts",
+            "hosts": hosts_list,
+            "fields": [],
+        },
+        {
+            "id": "thresholds",
+            "title": "Threshold Configurations",
+            "description": "Named alert threshold sets. Each defines warning/critical levels per metric.",
+            "section_mode": "thresholds",
+            "api_section": "thresholds",
+            "threshold_configs": threshold_config_list,
+            "fields": [
+                field("default_threshold_config", "Default config", "text",
+                      "Threshold config used for hosts with no explicit mapping.", editable=True),
+            ],
+        },
+        {
+            "id": "runtime",
+            "title": "Runtime",
+            "description": "Flags set at startup (require restart to change).",
+            "section_mode": "form",
+            "api_section": None,
+            "fields": [
+                field("foreground", "Foreground mode", "boolean",
+                      "Run in the foreground instead of daemonising."),
+                field("verbose",    "Verbose logging",  "boolean",
+                      "Enable verbose log output."),
+                field("debug",      "Debug level",      "number",
+                      "0 = off. Higher values increase log verbosity."),
+            ],
+        },
+    ]
+
+
+def get_settings_data(config: dict, threshold_checker=None) -> dict:
+    """Return sections list + auxiliary data for the settings template."""
+    sections = get_settings_sections(config, threshold_checker=threshold_checker)
+    all_channel_names = sorted((config.get("notification_channels") or {}).keys())
+    all_usernames = sorted((config.get("users") or {}).keys())
+    all_threshold_configs = sorted((config.get("threshold_configs") or {}).keys())
+    return {
+        "sections": sections,
+        "all_channel_names": all_channel_names,
+        "all_usernames": all_usernames,
+        "all_threshold_configs": all_threshold_configs,
+    }

hbd/server/static/style.css

@@ -139,4 +139,69 @@
       font-size: 9px;
       float: left;
   }
-  
+
+/* ── Responsive / mobile ── */
+
+/* Suppress the global transition on mobile to avoid sluggish feel */
+@media (max-width: 640px) {
+  * { transition: none !important; }
+
+  html, body {
+    overflow: auto;
+    height: auto;
+    font-size: 16px;          /* prevent iOS auto-zoom on inputs */
+  }
+
+  /* Pages that use flex-column full-viewport layout need to relax on mobile */
+  body[style*="height: 100vh"],
+  body {
+    height: auto !important;
+    min-height: 100vh;
+  }
+
+  /* Containers: full width, no fixed heights */
+  .container {
+    max-width: 100% !important;
+    max-height: none !important;
+    overflow: visible !important;
+    padding: 8px !important;
+  }
+
+  /* Log section: fixed reasonable height instead of flex-grow */
+  .log-section {
+    flex: none !important;
+    max-height: 40vh !important;
+    overflow-y: auto !important;
+  }
+
+  /* Table section: allow vertical scroll, cap height */
+  .table-section {
+    max-height: 55vh !important;
+    overflow-y: auto !important;
+    overflow-x: auto !important;
+    padding: 8px !important;
+  }
+
+  /* Slightly larger tap targets in tables */
+  #ntable td, #ntable th {
+    padding: 4px 6px !important;
+    font-size: 1.00em !important;
+  }
+
+  /* Cards on plugin/alerts pages */
+  .host-card, .alert-card, .card {
+    padding: 10px !important;
+    margin-bottom: 8px !important;
+  }
+
+  /* Settings page tables */
+  table { width: 100%; }
+
+  h1 { font-size: 1.2em !important; }
+  h2 { font-size: 1em !important; }
+}
+
+/* Suppress nav-username text on very narrow screens — avatar/initials is enough */
+@media (max-width: 400px) {
+  .nav-username { display: none; }
+}

hbd/server/templates/about.html

@@ -0,0 +1,212 @@
+<!DOCTYPE html>
+<html>
+  {% include 'head.html' %}
+
+  <style>
+    html, body { overflow: visible; }
+
+    .container {
+      max-width: 700px;
+      margin: 0 auto;
+    }
+
+    h1 {
+      color: #333;
+      margin-bottom: 4px;
+      font-size: 1.5em;
+    }
+
+    .subtitle {
+      color: #666;
+      margin-bottom: 24px;
+      font-size: 0.9em;
+    }
+
+    .section {
+      background: #fff;
+      border-radius: 8px;
+      box-shadow: 0 1px 6px rgba(0,0,0,0.1);
+      padding: 20px 24px;
+      margin-bottom: 20px;
+    }
+
+    .section h2 {
+      font-size: 1em;
+      font-weight: 700;
+      color: #333;
+      margin: 0 0 16px;
+      padding-bottom: 10px;
+      border-bottom: 1px solid #eee;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
+    }
+
+    .info-row {
+      display: flex;
+      align-items: baseline;
+      padding: 8px 0;
+      border-bottom: 1px solid #f5f5f5;
+      font-size: 0.9em;
+    }
+    .info-row:last-child { border-bottom: none; }
+
+    .info-label {
+      width: 160px;
+      flex-shrink: 0;
+      color: #666;
+      font-size: 0.88em;
+    }
+
+    .info-value {
+      color: #222;
+      word-break: break-all;
+    }
+
+    .info-value a {
+      color: #0066cc;
+      text-decoration: none;
+    }
+    .info-value a:hover { text-decoration: underline; }
+
+    .version-badge {
+      display: inline-block;
+      padding: 3px 12px;
+      background: #e8f0fe;
+      color: #1a73e8;
+      border-radius: 12px;
+      font-size: 1.00em;
+      font-weight: 600;
+      font-family: monospace;
+    }
+
+    .hb-logo {
+      font-size: 2.5em;
+      font-weight: 700;
+      color: #0066cc;
+      letter-spacing: -1px;
+      margin-bottom: 6px;
+    }
+
+    .hb-tagline {
+      color: #555;
+      font-size: 0.95em;
+    }
+
+    .logo-section {
+      display: flex;
+      align-items: center;
+      gap: 20px;
+      padding: 8px 0 4px;
+    }
+
+    .logo-text { flex: 1; }
+
+    /* ── Dark mode ── */
+    html[data-theme="dark"] h1 { color: var(--text); }
+    html[data-theme="dark"] .subtitle { color: var(--text-sec); }
+    html[data-theme="dark"] .section { background: var(--surface); box-shadow: 0 1px 6px var(--shadow); }
+    html[data-theme="dark"] .section h2 { color: var(--text); border-bottom-color: var(--border); }
+    html[data-theme="dark"] .info-row { border-bottom-color: var(--border-4); }
+    html[data-theme="dark"] .info-label { color: var(--text-sec); }
+    html[data-theme="dark"] .info-value { color: var(--text); }
+    html[data-theme="dark"] .info-value a { color: var(--link); }
+    html[data-theme="dark"] .hb-logo { color: var(--link); }
+    html[data-theme="dark"] .hb-tagline { color: var(--text-sec); }
+    html[data-theme="dark"] .version-badge { background: #1a3255; color: #60a5fa; }
+  </style>
+
+  <body>
+    {% include 'nav.html' %}
+
+    <div class="container">
+      <h1>{{ header }}</h1>
+      <p class="subtitle">Heartbeat monitoring system</p>
+
+      <div class="section">
+        <div class="logo-section">
+          <div class="logo-text">
+            <div class="hb-logo">Heartbeat</div>
+            <div class="hb-tagline">Lightweight host monitoring over UDP</div>
+          </div>
+          <span class="version-badge">v{{ hbd_version }}</span>
+        </div>
+      </div>
+
+      <div class="section">
+        <h2>Version</h2>
+        <div class="info-row">
+          <span class="info-label">Server version</span>
+          <span class="info-value">{{ hbd_version }}</span>
+        </div>
+        <div class="info-row">
+          <span class="info-label">Python</span>
+          <span class="info-value">{{ python_version }}</span>
+        </div>
+        <div class="info-row">
+          <span class="info-label">License</span>
+          <span class="info-value">MIT</span>
+        </div>
+      </div>
+
+      <div class="section">
+        <h2>Runtime</h2>
+        <div class="info-row">
+          <span class="info-label">Host</span>
+          <span class="info-value">{{ server_hostname }}</span>
+        </div>
+        <div class="info-row">
+          <span class="info-label">Started</span>
+          <span class="info-value">{{ start_time_str }}</span>
+        </div>
+        <div class="info-row">
+          <span class="info-label">Uptime</span>
+          <span class="info-value" id="uptime-value">{{ uptime_str }}</span>
+        </div>
+        <div class="info-row">
+          <span class="info-label">Hosts monitored</span>
+          <span class="info-value">{{ host_count }}</span>
+        </div>
+      </div>
+
+      <div class="section">
+        <h2>Contact &amp; Source</h2>
+        <div class="info-row">
+          <span class="info-label">Author</span>
+          <span class="info-value">Andreas Wrede</span>
+        </div>
+        <div class="info-row">
+          <span class="info-label">Email</span>
+          <span class="info-value"><a href="mailto:aew.hbd@wrede.ca">aew.hbd@wrede.ca</a></span>
+        </div>
+        <div class="info-row">
+          <span class="info-label">Repository</span>
+          <span class="info-value"><a href="https://git.wrede.ca/andreas/heartbeat" target="_blank" rel="noopener">git.wrede.ca/andreas/heartbeat</a></span>
+        </div>
+      </div>
+
+    </div>
+
+    <script>
+      (function() {
+        var startEpoch = {{ start_epoch }};
+        var el = document.getElementById('uptime-value');
+        if (!el) return;
+        function fmt(s) {
+          var d = Math.floor(s / 86400);
+          var h = Math.floor((s % 86400) / 3600);
+          var m = Math.floor((s % 3600) / 60);
+          var sec = s % 60;
+          if (d > 0) return d + 'd ' + h + 'h ' + m + 'm';
+          if (h > 0) return h + 'h ' + m + 'm ' + sec + 's';
+          return m + 'm ' + sec + 's';
+        }
+        function tick() {
+          var up = Math.floor(Date.now() / 1000 - startEpoch);
+          el.textContent = fmt(up);
+        }
+        tick();
+        setInterval(tick, 1000);
+      })();
+    </script>
+  </body>
+</html>

hbd/server/templates/alerts.html

@@ -3,33 +3,10 @@
   {% include 'head.html' %}
 
   <style>
-    body {
-      margin: 20px;
-      background: #f5f5f5;
-    }
 
-    .nav {
+    html, body {
-      background: #fff;
+      height: auto;
-      padding: 15px;
+      overflow-y: auto;
-      margin-bottom: 20px;
-      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
-      border-radius: 4px;
-    }
-
-    .nav a {
-      margin-right: 20px;
-      text-decoration: none;
-      color: #0066cc;
-      font-weight: 500;
-    }
-
-    .nav a:hover {
-      text-decoration: underline;
-    }
-
-    .nav a.active {
-      color: #333;
-      font-weight: bold;
     }
 
     .container {
@@ -37,10 +14,7 @@
       margin: 0 auto;
     }
 
-    h1 {
+    h1 { color: #333; margin-bottom: 5px; margin-top: 15px; font-size: 1.5em; }
-      color: #333;
-      margin-bottom: 10px;
-    }
 
     .subtitle {
       color: #666;
@@ -48,55 +22,40 @@
     }
 
     .summary-cards {
-      display: grid;
+      display: flex;
-      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+      flex-wrap: wrap;
-      gap: 20px;
+      gap: 10px;
-      margin-bottom: 30px;
+      margin-bottom: 16px;
     }
 
     .summary-card {
       background: white;
-      border-radius: 8px;
+      border-radius: 6px;
-      padding: 20px;
+      padding: 6px 14px;
-      box-shadow: 0 2px 8px rgba(0,0,0,0.1);
+      box-shadow: 0 1px 4px rgba(0,0,0,0.1);
-      text-align: center;
+      display: flex;
+      align-items: center;
+      gap: 8px;
+      border-left: 4px solid #ddd;
     }
 
-    .summary-card.critical {
+    .summary-card.critical { border-left-color: #ea1e0f; }
-      border-left: 5px solid #f44336;
+    .summary-card.warning  { border-left-color: #ff9800; }
-    }
+    .summary-card.ok       { border-left-color: #4caf50; }
-
-    .summary-card.warning {
-      border-left: 5px solid #ff9800;
-    }
-
-    .summary-card.ok {
-      border-left: 5px solid #4caf50;
-    }
 
     .summary-number {
-      font-size: 3em;
+      font-size: 1.4em;
       font-weight: bold;
-      margin: 10px 0;
+      line-height: 1;
     }
 
-    .summary-number.critical {
+    .summary-number.critical { color: #ea1e0f; }
-      color: #f44336;
+    .summary-number.warning  { color: #ff9800; }
-    }
+    .summary-number.ok       { color: #4caf50; }
-
-    .summary-number.warning {
-      color: #ff9800;
-    }
-
-    .summary-number.ok {
-      color: #4caf50;
-    }
 
     .summary-label {
       color: #666;
-      text-transform: uppercase;
+      font-size: 1.00em;
-      font-size: 0.9em;
-      letter-spacing: 1px;
     }
 
     .filters {
@@ -135,6 +94,24 @@
       border-color: #2196f3;
     }
 
+    .filter-input {
+      padding: 7px 12px;
+      border: 2px solid #ddd;
+      border-radius: 20px;
+      font-size: 0.9em;
+      outline: none;
+      width: 200px;
+      transition: border-color 0.2s;
+    }
+
+    .filter-input:focus {
+      border-color: #2196f3;
+    }
+
+    .filter-input.invalid {
+      border-color: #f44336;
+    }
+
     .alerts-container {
       background: white;
       border-radius: 8px;
@@ -155,7 +132,7 @@
     }
     
     .alert-item.acknowledged {
-      opacity: 0.6;
+      opacity: 0.8;
       background: #f0f0f0;
     }
 
@@ -216,14 +193,18 @@
 
     .alert-hostname {
       font-weight: bold;
-      color: #333;
+      color: #0066cc;
       font-size: 1.1em;
+      text-decoration: none;
+    }
+    .alert-hostname:hover {
+      text-decoration: underline;
     }
 
     .alert-metric {
-      color: #666;
+      color: #0066cc;
-      font-family: 'Courier New', monospace;
+      font-size: 1.1em;
-      font-size: 0.9em;
+      font-weight: normal;
     }
 
     .alert-details {
@@ -240,7 +221,7 @@
 
     .alert-duration {
       color: #999;
-      font-size: 0.85em;
+      font-size: 1.00em;
     }
     
     .alert-actions {
@@ -257,7 +238,7 @@
       border: none;
       border-radius: 4px;
       cursor: pointer;
-      font-size: 0.85em;
+      font-size: 1.00em;
       transition: all 0.2s;
       white-space: nowrap;
     }
@@ -312,7 +293,7 @@
     .refresh-info {
       text-align: center;
       color: #999;
-      font-size: 0.85em;
+      font-size: 1.00em;
       margin-top: 20px;
       padding-top: 20px;
       border-top: 1px solid #e0e0e0;
@@ -324,14 +305,35 @@
       text-align: right;
       margin-bottom: 15px;
     }
+
+    /* ── Dark mode ── */
+    html[data-theme="dark"] h1 { color: var(--text); }
+    html[data-theme="dark"] .subtitle { color: var(--text-sec); }
+    html[data-theme="dark"] .summary-card { background: var(--surface); }
+    html[data-theme="dark"] .summary-label { color: var(--text-sec); }
+    html[data-theme="dark"] .filters { background: var(--surface); }
+    html[data-theme="dark"] .filter-label { color: var(--text-sec); }
+    html[data-theme="dark"] .filter-button { background: var(--surface-2); border-color: var(--border); color: var(--text); }
+    html[data-theme="dark"] .filter-button.active { background: #2196f3; color: #fff; border-color: #2196f3; }
+    html[data-theme="dark"] .filter-input { background: var(--input-bg); border-color: var(--input-border); color: var(--text); }
+    html[data-theme="dark"] .alerts-container { background: var(--surface); }
+    html[data-theme="dark"] .alert-item { background: var(--surface-2); }
+    html[data-theme="dark"] .alert-item.acknowledged { background: var(--surface-3); }
+    html[data-theme="dark"] .alert-item.critical { background: #2e0a0a; border-left-color: #f44336; }
+    html[data-theme="dark"] .alert-item.warning  { background: #2e1a00; border-left-color: #ff9800; }
+    html[data-theme="dark"] .alert-item.unknown  { background: var(--surface-2); }
+    html[data-theme="dark"] .alert-hostname { color: var(--link); }
+    html[data-theme="dark"] .alert-details { color: var(--text-sec); }
+    html[data-theme="dark"] .alert-value { color: var(--text); }
+    html[data-theme="dark"] .alert-duration { color: var(--text-muted); }
+    html[data-theme="dark"] .last-update { color: var(--text-sec); }
+    html[data-theme="dark"] .refresh-info { color: var(--text-muted); border-top-color: var(--border); }
+    html[data-theme="dark"] .no-alerts,
+    html[data-theme="dark"] .loading { color: var(--text-muted); }
   </style>
 
   <body>
-    <div class="nav">
+    {% include 'nav.html' %}
-      <a href="/live">Live Dashboard</a>
-      <a href="/plugins">Plugin Metrics</a>
-      <a href="/alerts" class="active">Alerts</a>
-    </div>
 
     <div class="container">
       <h1>{{ header }}</h1>
@@ -357,6 +359,7 @@
         <button class="filter-button active" onclick="filterAlerts('all')">All</button>
         <button class="filter-button" onclick="filterAlerts('critical')">Critical Only</button>
         <button class="filter-button" onclick="filterAlerts('warning')">Warning Only</button>
+        <input id="host-filter" class="filter-input" type="text" placeholder="host filter (regex)" oninput="onHostFilterInput(this)">
       </div>
 
       <div class="alerts-container">
@@ -373,6 +376,7 @@
     <script>
       let currentFilter = 'all';
       let allAlerts = [];
+      let hostFilterRe = null;
 
       async function loadAlerts() {
         try {
@@ -407,10 +411,13 @@
         // Filter alerts based on current filter
         let filteredAlerts = alerts;
         if (currentFilter !== 'all') {
-          filteredAlerts = alerts.filter(alert => 
+          filteredAlerts = filteredAlerts.filter(alert =>
             alert.level.toLowerCase() === currentFilter
           );
         }
+        if (hostFilterRe) {
+          filteredAlerts = filteredAlerts.filter(alert => hostFilterRe.test(alert.hostname));
+        }
         
         if (filteredAlerts.length === 0) {
           if (currentFilter === 'all' && alerts.length === 0) {
@@ -450,6 +457,10 @@
         } else if (alert.threshold_value !== undefined && alert.threshold_value !== null && alert.operator) {
           valueText += ` <span class="threshold-info">(threshold: ${alert.operator} ${formatValue(alert.threshold_value)})</span>`;
         }
+        if (alert.recovery_threshold !== undefined && alert.recovery_threshold !== null) {
+          const recOp = (alert.operator === '>' || alert.operator === '>=') ? '<' : '>';
+          valueText += ` <span class="threshold-info" style="color:#888">(recovers ${recOp} ${formatValue(alert.recovery_threshold)})</span>`;
+        }
         
         // Build actions section
         let actionsHtml = '';
@@ -474,9 +485,9 @@
             <div class="alert-main">
               <div class="alert-header">
                 <span class="alert-level ${level}">${alert.level}</span>
-                <span class="alert-hostname">${alert.hostname}</span>
+                <a class="alert-hostname" href="/plugins#${alert.hostname}">${alert.hostname}</a>
+                <span class="alert-metric">${(alert.metric_path.includes('.') ? alert.metric_path.slice(alert.metric_path.indexOf('.') + 1) : alert.metric_path).replace(/_status_code$/, '')}</span>
               </div>
-              <div class="alert-metric">${alert.metric_path}</div>
               <div class="alert-details">
                 <span>${valueText}</span>
                 <span class="alert-duration">Active for ${duration}</span>
@@ -575,9 +586,36 @@
         }
       }
 
+      function onHostFilterInput(input) {
+        const val = input.value.trim();
+        if (!val) {
+          hostFilterRe = null;
+          input.classList.remove('invalid');
+        } else {
+          try {
+            hostFilterRe = new RegExp(val, 'i');
+            input.classList.remove('invalid');
+          } catch (_) {
+            hostFilterRe = null;
+            input.classList.add('invalid');
+          }
+        }
+        renderAlerts(allAlerts);
+      }
+
       // Auto-refresh every 15 seconds
       setInterval(loadAlerts, 15000);
 
+      // Initialise filter from URL query string (?filter=...)
+      (function () {
+        const param = new URLSearchParams(window.location.search).get('filter');
+        if (param) {
+          const input = document.getElementById('host-filter');
+          input.value = param;
+          onHostFilterInput(input);
+        }
+      })();
+
       // Initial load
       loadAlerts();
     </script>

hbd/server/templates/foot.html

@@ -1,5 +1,5 @@
  <footer>
  <div id="copyright">
-    &copy;2002-2026 <A HREF="mailto:andreas@wrede.ca">Andreas Wrede</A> All Rights Reserved.</p>
+    &copy;2002-2026 <A HREF="mailto:aew.hbd@wrede.ca">Andreas Wrede</A> All Rights Reserved.</p>
     </div>
 </footer>

hbd/server/templates/head.html

@@ -1,7 +1,386 @@
 <head>
     <meta http-equiv="content-type" content="text/html; charset=utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <link rel="stylesheet" href="/static/style.css" type="text/css" />
     <link rel="icon" href="/static/images/favicon.ico" sizes="32x32" />
     <title>{{ title }}</title>
-    <script src="{{ extra_scripts }}"></script>
+    {% if extra_scripts %}<script src="{{ extra_scripts }}"></script>{% endif %}
+    <script>
+    /* Apply saved theme before first paint to avoid flash */
+    (function() {
+      try {
+        var p = localStorage.getItem('hbd_theme') || 'auto';
+        var dark = p === 'dark' || (p === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches);
+        if (dark) document.documentElement.setAttribute('data-theme', 'dark');
+      } catch(e) {}
+    })();
+    </script>
+    <style>
+      /* ── Theme variables ── */
+      :root {
+        --bg:           #f5f5f5;
+        --surface:      #ffffff;
+        --surface-2:    #f8f8f8;
+        --surface-3:    #f5f5f5;
+        --text:         #222222;
+        --text-2:       #333333;
+        --text-3:       #555555;
+        --text-sec:     #666666;
+        --text-muted:   #888888;
+        --text-dim:     #aaaaaa;
+        --text-ghost:   #cccccc;
+        --border:       #e0e0e0;
+        --border-2:     #eeeeee;
+        --border-3:     #f0f0f0;
+        --border-4:     #f5f5f5;
+        --link:         #0066cc;
+        --nav-bg:       #ffffff;
+        --input-bg:     #ffffff;
+        --input-border: #cccccc;
+        --shadow-sm:    rgba(0,0,0,.08);
+        --shadow:       rgba(0,0,0,.10);
+        --shadow-nav:   rgba(0,0,0,.10);
+      }
+      html[data-theme="dark"] {
+        color-scheme: dark;
+        --bg:           #111827;
+        --surface:      #1f2937;
+        --surface-2:    #283447;
+        --surface-3:    #374151;
+        --text:         #e5e7eb;
+        --text-2:       #d1d5db;
+        --text-3:       #9ca3af;
+        --text-sec:     #9ca3af;
+        --text-muted:   #6b7280;
+        --text-dim:     #4b5563;
+        --text-ghost:   #374151;
+        --border:       #374151;
+        --border-2:     #2d3748;
+        --border-3:     #253040;
+        --border-4:     #1e2a38;
+        --link:         #60a5fa;
+        --nav-bg:       #1f2937;
+        --input-bg:     #283447;
+        --input-border: #4b5563;
+        --shadow-sm:    rgba(0,0,0,.30);
+        --shadow:       rgba(0,0,0,.40);
+        --shadow-nav:   rgba(0,0,0,.40);
+      }
+
+      /* ── Reset / shared baseline ── */
+      *, *::before, *::after { box-sizing: border-box; }
+      html {
+        font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
+        font-size: 14px;
+      }
+      body {
+        margin: 0;
+        padding: 10px;
+        padding-top: 60px;
+        background: var(--bg);
+        color: var(--text);
+      }
+      h1 { font-size: 1.5em; color: var(--text-2); margin: 0 0 5px; }
+      h2 { font-size: 1.1em; color: var(--text-2); margin: 0 0 8px; }
+      p  { margin: 0; }
+
+      /* Navigation bar — shared across all pages */
+      .nav {
+        position: fixed;
+        top: 0;
+        left: 0;
+        right: 0;
+        z-index: 200;
+        background: var(--nav-bg);
+        padding: 6px 12px;
+        box-shadow: 0 2px 4px var(--shadow-nav);
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+        flex-wrap: wrap;
+        gap: 8px;
+      }
+      .nav-links { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; }
+      .nav a {
+        margin-right: 20px;
+        text-decoration: none;
+        color: var(--link);
+        font-weight: 500;
+        font-size: 0.9em;
+      }
+      .nav a:hover { text-decoration: underline; }
+      .nav a.active { color: var(--text-2); font-weight: bold; }
+      .nav-user {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+        text-decoration: none;
+        color: var(--text-2);
+        font-size: 0.9em;
+        font-weight: 500;
+        padding: 4px 8px;
+        border-radius: 20px;
+        transition: background 0.15s;
+      }
+      .nav-user:hover { background: var(--surface-2); text-decoration: none; }
+      .nav-username {
+        max-width: 0;
+        overflow: hidden;
+        white-space: nowrap;
+        opacity: 0;
+        transition: max-width 0.2s ease, opacity 0.2s ease;
+      }
+      .nav-user:hover .nav-username {
+        max-width: 160px;
+        opacity: 1;
+      }
+      .nav-avatar {
+        width: 28px; height: 28px;
+        border-radius: 50%;
+        object-fit: cover;
+        flex-shrink: 0;
+      }
+      .nav-initials {
+        width: 28px; height: 28px;
+        border-radius: 50%;
+        background: var(--link);
+        color: #fff;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        font-size: 0.75em;
+        font-weight: 700;
+        flex-shrink: 0;
+      }
+
+      /* ── Mobile nav: hamburger toggle ── */
+      .nav-hamburger {
+        display: none;
+        flex-direction: column;
+        justify-content: space-between;
+        width: 26px; height: 20px;
+        cursor: pointer;
+        flex-shrink: 0;
+        background: none;
+        border: none;
+        padding: 0;
+      }
+      .nav-hamburger span {
+        display: block;
+        height: 3px;
+        background: var(--text-muted);
+        border-radius: 2px;
+      }
+
+      @media (max-width: 640px) {
+        .nav-hamburger { display: flex; }
+        .nav-links {
+          display: none;
+          width: 100%;
+          flex-direction: column;
+          align-items: flex-start;
+          padding-top: 8px;
+          border-top: 1px solid var(--border-2);
+          order: 3;
+        }
+        .nav-links.nav-open { display: flex; }
+        .nav-links a { margin-right: 0; padding: 6px 0; font-size: 1em; }
+      }
+
+      /* ── Global dark-mode: inputs ── */
+      html[data-theme="dark"] input:not([type=checkbox]):not([type=radio]),
+      html[data-theme="dark"] select,
+      html[data-theme="dark"] textarea {
+        background-color: var(--input-bg);
+        border-color: var(--input-border);
+        color: var(--text);
+      }
+
+      /* Pending config publish button */
+      .nav-publish-btn {
+        background: #e65100;
+        color: #fff;
+        border: none;
+        border-radius: 4px;
+        padding: 4px 10px;
+        font-size: 0.82em;
+        font-weight: 600;
+        cursor: pointer;
+        flex-shrink: 0;
+        white-space: nowrap;
+        margin-left: auto;
+      }
+      .nav-publish-btn:hover { background: #bf360c; }
+      .nav-publish-btn:disabled { opacity: 0.7; cursor: default; }
+
+      /* Swiss railway clock — nav */
+      .nav-pie {
+        flex-shrink: 0;
+        line-height: 0;
+        margin-left: auto;
+        padding: 4px 4px 4px 0;
+      }
+      #alert-pie { display: block; cursor: default; }
+      .nav-clock {
+        flex-shrink: 0;
+        line-height: 0;
+        padding: 4px 4px 4px 0;
+        cursor: pointer;
+      }
+      #swiss-clock { display: block; }
+
+      /* Swiss railway clock — full-page overlay */
+      #clock-overlay {
+        display: none;
+        position: fixed;
+        inset: 0;
+        z-index: 9999;
+        background: #1a1a1a;
+        align-items: center;
+        justify-content: center;
+        cursor: pointer;
+      }
+      #clock-overlay.visible { display: flex; }
+      #swiss-clock-overlay { display: block; }
+    </style>
+    <script>
+    /* ── Swiss Federal Railway (SBB) clock ── */
+
+    /* Draw one frame of the clock onto any canvas element. */
+    function drawSwissClock(canvas) {
+      var SIZE = canvas.width;
+      var R = SIZE / 2;
+      var ctx = canvas.getContext('2d');
+      var now = new Date();
+      var h  = now.getHours() % 12;
+      var m  = now.getMinutes();
+      var s  = now.getSeconds();
+      var ms = now.getMilliseconds();
+
+      /* Seconds hand idles ~1.5 s at 12 before advancing (SBB behaviour) */
+      var sFrac = s + ms / 1000;
+      var sAngle = sFrac >= 58.5 ? 0 : (sFrac / 58.5) * Math.PI * 2;
+
+      ctx.clearRect(0, 0, SIZE, SIZE);
+
+      /* face */
+      ctx.beginPath();
+      ctx.arc(R, R, R - 1, 0, Math.PI * 2);
+      ctx.fillStyle = '#fff';
+      ctx.fill();
+      ctx.strokeStyle = '#333';
+      ctx.lineWidth = SIZE * 0.018;
+      ctx.stroke();
+
+      /* tick marks */
+      for (var i = 0; i < 60; i++) {
+        var a = (i / 60) * Math.PI * 2 - Math.PI / 2;
+        var isHour = (i % 5 === 0);
+        ctx.beginPath();
+        ctx.moveTo(R + Math.cos(a) * (isHour ? R * 0.72 : R * 0.88),
+                   R + Math.sin(a) * (isHour ? R * 0.72 : R * 0.88));
+        ctx.lineTo(R + Math.cos(a) * R * 0.94,
+                   R + Math.sin(a) * R * 0.94);
+        ctx.strokeStyle = '#222';
+        ctx.lineWidth = isHour ? SIZE * 0.027 : SIZE * 0.011;
+        ctx.lineCap = 'butt';
+        ctx.stroke();
+      }
+
+      /* hands */
+      function hand(angle, tip, tail, width, color) {
+        ctx.save();
+        ctx.translate(R, R);
+        ctx.rotate(angle);
+        ctx.beginPath();
+        ctx.moveTo(tail, 0);
+        ctx.lineTo(tip,  0);
+        ctx.strokeStyle = color;
+        ctx.lineWidth = width;
+        ctx.lineCap = 'square';
+        ctx.stroke();
+        ctx.restore();
+      }
+
+      hand((sFrac >= 58.5 ? m + 1 : m) / 60 * Math.PI * 2 - Math.PI / 2,
+           R * 0.88, -R * 0.12, SIZE * 0.027, '#222');           /* minute */
+      hand((h + m / 60) / 12 * Math.PI * 2 - Math.PI / 2,
+           R * 0.58, -R * 0.12, SIZE * 0.039, '#222');           /* hour   */
+      hand(sAngle - Math.PI / 2, R * 0.78, -R * 0.22,
+           SIZE * 0.013, '#e00');                                 /* second tail+tip */
+
+      /* round dot at tip of second hand */
+      var dotR = SIZE * 0.028;
+      ctx.save();
+      ctx.translate(R, R);
+      ctx.rotate(sAngle - Math.PI / 2);
+      ctx.beginPath();
+      ctx.arc(R * 0.78, 0, dotR, 0, Math.PI * 2);
+      ctx.fillStyle = '#e00';
+      ctx.fill();
+      ctx.restore();
+
+      /* centre cap */
+      ctx.beginPath();
+      ctx.arc(R, R, R * 0.04, 0, Math.PI * 2);
+      ctx.fillStyle = '#222';
+      ctx.fill();
+    }
+
+    /* Resize the overlay canvas to fit the viewport, keeping it square. */
+    function resizeOverlayClock() {
+      var oc = document.getElementById('swiss-clock-overlay');
+      if (!oc) return;
+      var size = Math.min(window.innerWidth, window.innerHeight) * 0.88;
+      size = Math.floor(size);
+      oc.width  = size;
+      oc.height = size;
+    }
+
+    /* Main tick — redraws both nav clock and (if visible) overlay clock. */
+    function clockTick() {
+      var nav = document.getElementById('swiss-clock');
+      if (nav) drawSwissClock(nav);
+      var overlay = document.getElementById('clock-overlay');
+      if (overlay && overlay.classList.contains('visible')) {
+        var oc = document.getElementById('swiss-clock-overlay');
+        if (oc) drawSwissClock(oc);
+      }
+      var delay = 100 - (Date.now() % 100);
+      setTimeout(clockTick, delay);
+    }
+
+    /* Keep auto-theme in sync with system setting changes */
+    try {
+      window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function(e) {
+        var pref = localStorage.getItem('hbd_theme') || 'auto';
+        if (pref === 'auto') {
+          if (e.matches) { document.documentElement.setAttribute('data-theme', 'dark'); }
+          else { document.documentElement.removeAttribute('data-theme'); }
+        }
+      });
+    } catch(e) {}
+
+    document.addEventListener('DOMContentLoaded', function() {
+      /* Start the shared tick loop */
+      clockTick();
+
+      /* Overlay toggle — clicking the nav clock opens it */
+      var navClock = document.querySelector('.nav-clock');
+      var overlay  = document.getElementById('clock-overlay');
+      if (navClock && overlay) {
+        navClock.addEventListener('click', function() {
+          resizeOverlayClock();
+          overlay.classList.add('visible');
+        });
+        overlay.addEventListener('click', function() {
+          overlay.classList.remove('visible');
+        });
+        window.addEventListener('resize', function() {
+          if (overlay.classList.contains('visible')) resizeOverlayClock();
+        });
+      }
+    });
+    </script>
+    <script src="static/sorttable.js"></script>
 </head>

hbd/server/templates/live.html

@@ -4,47 +4,48 @@
 
   <style>
     body {
-      margin: 10px;
+      display: flex;
-      background: #f5f5f5;
+      flex-direction: column;
+      height: 100vh;
       overflow: hidden;
     }
 
-    .nav {
+    @media (max-width: 640px) {
-      background: #fff;
+      body {
-      padding: 10px 15px;
+        height: auto;
-      margin-bottom: 10px;
+        min-height: 100vh;
-      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
+        overflow: auto;
-      border-radius: 4px;
+        flex-direction: column;
-    }
+      }
-
+      .container {
-    .nav a {
+        max-height: none;
-      margin-right: 20px;
+        overflow: visible;
-      text-decoration: none;
+      }
-      color: #0066cc;
+      .table-section {
-      font-weight: 500;
+        max-height: 55vh;
-      font-size: 0.9em;
+      }
-    }
+      .log-section {
-
+        flex: none;
-    .nav a:hover {
+        max-height: 40vh;
-      text-decoration: underline;
+      }
-    }
-
-    .nav a.active {
-      color: #333;
-      font-weight: bold;
     }
 
     .container {
+      flex: 1;
+      min-height: 0;
       max-width: 1600px;
+      width: 100%;
       margin: 0 auto;
-      max-height: calc(100vh - 120px);
+      display: flex;
-      overflow-y: auto;
+      flex-direction: column;
-      padding-right: 10px;
+      gap: 15px;
+      overflow: hidden;
     }
 
     h1 {
       color: #333;
       margin-bottom: 5px;
+      margin-top: 15px; 
       font-size: 1.5em;
     }
 
@@ -75,14 +76,18 @@
       border-radius: 6px;
       padding: 15px;
       box-shadow: 0 1px 4px rgba(0,0,0,0.1);
+      overflow-x: auto;
+      overflow-y: auto;
+      max-height: 60vh;
     }
 
     .log-section {
+      flex: 1;
+      min-height: 0;
       background: white;
       border-radius: 6px;
       padding: 15px;
       box-shadow: 0 1px 4px rgba(0,0,0,0.1);
-      max-height: 400px;
       overflow-y: auto;
     }
 
@@ -96,7 +101,8 @@
     #ntable th {
       border: 1px solid #e0e0e0;
       text-align: left;
-      padding: 8px 10px;
+      padding: 2px 4px;
+      white-space: nowrap;
     }
 
     #ntable tr:nth-child(even) {
@@ -107,8 +113,24 @@
       background-color: #e3f2fd;
     }
 
+    #ntable tbody tr.row-warning {
+      background-color: #fff8c5;
+    }
+
+    #ntable tbody tr.row-critical {
+      background-color: #fde8e8;
+    }
+
+    #ntable tbody tr.row-warning:hover {
+      background-color: #fff0a0;
+    }
+
+    #ntable tbody tr.row-critical:hover {
+      background-color: #f9c8c8;
+    }
+
     #ntable th {
-      padding: 12px 10px;
+      padding: 6px 8px;
       background-color: #2196f3;
       color: white;
       font-weight: 600;
@@ -137,39 +159,85 @@
     }
 
     /* Scrollbar styling */
-    .container::-webkit-scrollbar,
     .log-section::-webkit-scrollbar {
       width: 8px;
     }
 
-    .container::-webkit-scrollbar-track,
     .log-section::-webkit-scrollbar-track {
       background: #f1f1f1;
       border-radius: 4px;
     }
 
-    .container::-webkit-scrollbar-thumb,
     .log-section::-webkit-scrollbar-thumb {
       background: #888;
       border-radius: 4px;
     }
 
-    .container::-webkit-scrollbar-thumb:hover,
     .log-section::-webkit-scrollbar-thumb:hover {
       background: #555;
     }
 
     /* Message styling */
     #messages {
-      font-size: 0.85em;
+      font-size: 1.00em;
-      line-height: 1.6;
+      line-height: 1.0;
     }
 
-    #messages div {
+    #messages .log-entry {
       padding: 5px 0;
       border-bottom: 1px solid #f0f0f0;
+      display: flex;
+      gap: 0.5em;
+      align-items: baseline;
     }
 
+    .log-ts { color: #888; white-space: nowrap; }
+    .log-level { font-weight: bold; min-width: 6em; }
+    .log-host { font-weight: 600; }
+    .log-service { color: #888; }
+
+    .log-warning .log-level  { color: #b8860b; }
+    .log-critical .log-level { color: #c00; }
+    .log-recover .log-level  { color: #2a7a2a; }
+    .log-info .log-level     { color: #555; }
+
+    .log-section-header {
+      display: flex;
+      align-items: center;
+      gap: 12px;
+      flex-wrap: wrap;
+      margin-bottom: 10px;
+      background: white;
+      border-radius: 6px;
+      box-shadow: 0 1px 4px rgba(0,0,0,0.1);
+      padding: 8px 15px;
+    }
+
+    .log-section-title {
+      font-size: 1.2em;
+      font-weight: bold;
+      color: #333;
+      white-space: nowrap;
+    }
+
+    .log-filter-bar {
+      display: flex;
+      gap: 6px;
+      align-items: center;
+      flex-wrap: wrap;
+    }
+
+    .log-filter-bar input[type="text"],
+    .log-filter-bar select {
+      padding: 3px 7px;
+      border: 1px solid #ccc;
+      border-radius: 4px;
+      font-size: 1.00em;
+      color: #333;
+    }
+
+    .log-filter-bar input[type="text"] { width: 110px; }
+
     /* Modal for connection status messages */
     .connection-modal {
       display: none;
@@ -218,21 +286,78 @@
       color: #ff9800;
       font-weight: 700;
     }
+    #ntable a.host-link { color: inherit; text-decoration: none; }
+    #ntable a.host-link:hover { text-decoration: underline; }
+
+    /* ── Dark mode ── */
+    html[data-theme="dark"] h1,
+    html[data-theme="dark"] h2 { color: var(--text); }
+    html[data-theme="dark"] .subtitle { color: var(--text-sec); }
+    html[data-theme="dark"] h2,
+    html[data-theme="dark"] .table-section,
+    html[data-theme="dark"] .log-section,
+    html[data-theme="dark"] .log-section-header { background: var(--surface); }
+    html[data-theme="dark"] .log-section-title { color: var(--text); }
+    html[data-theme="dark"] #ntable td,
+    html[data-theme="dark"] #ntable th { border-color: var(--border); }
+    html[data-theme="dark"] #ntable tr:nth-child(even) { background: var(--surface-2); }
+    html[data-theme="dark"] #ntable tr:hover { background: #1e3a5f; }
+    html[data-theme="dark"] #ntable tbody tr.row-warning { background: #3a2800; }
+    html[data-theme="dark"] #ntable tbody tr.row-critical { background: #3a0a0a; }
+    html[data-theme="dark"] #ntable tbody tr.row-warning:hover { background: #4a3200; }
+    html[data-theme="dark"] #ntable tbody tr.row-critical:hover { background: #4a1010; }
+    html[data-theme="dark"] #messages .log-entry { border-bottom-color: var(--border-3); }
+    html[data-theme="dark"] .log-ts,
+    html[data-theme="dark"] .log-service { color: var(--text-muted); }
+    html[data-theme="dark"] .log-info .log-level { color: var(--text-sec); }
+    html[data-theme="dark"] .log-filter-bar input,
+    html[data-theme="dark"] .log-filter-bar select { color: var(--text); }
+    html[data-theme="dark"] .connection-modal-content { background: var(--surface); color: var(--text); }
   </style>
   <script type="text/javascript">
     var cnt = 0;
     var nTable = document;
     var name_idx = {};
     var c = 0;
+    var HBD_VERSION = "{{ hbd_version }}";
+
+    function escHtml(s) {
+      var d = document.createElement('div');
+      d.textContent = String(s);
+      return d.innerHTML;
+    }
+
+    function hostNameHtml(data) {
+      var rawName = data.raw_name || data.name.replace(/<[^>]+>/g, '').replace('*', '').trim();
+      var nameHtml = escHtml(data.name);
+      if (!data.hbc_version || data.hbc_version !== HBD_VERSION) {
+        nameHtml += ' 🥀';
+      }
+      var display = data.dyn ? '<b>' + nameHtml + '</b>' : nameHtml;
+      return '<a class="host-link" href="/plugins#' + encodeURIComponent(rawName) + '">' + display + '</a>';
+    }
 
     function setup() {
       name_idx = {};
       nTable = document.getElementById("ntable");
       for (var i = 0, row; (row = nTable.rows[i]); i++) {
         if (i == 0) continue;
-        name = nTable.rows[i].cells[0].innerText;
+        var cell = nTable.rows[i].cells[0];
+        var name = cell.dataset.name || cell.innerText.replace(/\s*🥀\s*$/, '').trim();
         name_idx[name] = nTable.rows[i];
-        /* console.log("name_Id[" + name + "]: " + name_idx[name].innerText); */
+      }
+    }
+
+    function updateRowAlert(row, data) {
+      var criticalUnacked = data.alert_critical_unacked || 0;
+      var criticalAcked = data.alert_critical_acked || 0;
+      var warningUnacked = data.alert_warning_unacked || 0;
+      var warningAcked = data.alert_warning_acked || 0;
+      row.classList.remove('row-warning', 'row-critical');
+      if (criticalUnacked > 0 || criticalAcked > 0) {
+        row.classList.add('row-critical');
+      } else if (warningUnacked > 0 || warningAcked > 0) {
+        row.classList.add('row-warning');
       }
     }
 
@@ -270,11 +395,8 @@
       row.appendChild(c_ipv6state);
       row.appendChild(c_ipv6latency);
       row.appendChild(c_ipv6statets);
-      if (data.dyn) {
+      c_name.dataset.name = data.name;
-        c_name.innerHTML = "<b>" + data.name + "</b>";
+      c_name.innerHTML = hostNameHtml(data);
-      } else {
-        c_name.innerHTML = data.name;
-      }
       
       // Set alert counts in "x/y" format (unacked/acked)
       var warningUnacked = data.alert_warning_unacked || 0;
@@ -294,21 +416,40 @@
         c_critical.innerHTML = "";
       }
       
-      c_ipv4addr.innerHTML = data.connections[0].addr;
+      c_ipv4addr.innerHTML = escHtml(data.connections[0].addr);
-      c_ipv4state.innerHTML = data.connections[0].state;
+      c_ipv4state.innerHTML = escHtml(data.connections[0].state);
       if (data.connections.length > 1) {
-        c_ipv6addr.innerHTML = data.connections[1].addr;
+        c_ipv6addr.innerHTML = escHtml(data.connections[1].addr);
-        c_ipv6state.innerHTML = data.connections[1].state;
+        c_ipv6state.innerHTML = escHtml(data.connections[1].state);
       }
       var table = document.getElementById("ntablebody"); // find table to append to
       table.appendChild(row); // append row to table
       name_idx[c_name] = row;
+      updateRowAlert(row, data);
     }
 
     function formatTS(ts) {
-      const milliseconds = ts * 1000;
+      const now = new Date();
-      const dateObject = new Date(milliseconds);
+      const d = new Date(ts * 1000);
-      return dateObject.toLocaleString("de-DE");
+
+      const pad = n => String(n).padStart(2, '0');
+      const timeStr = `${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`;
+
+      // Same calendar day → show time only
+      if (d.toDateString() === now.toDateString()) {
+        return timeStr;
+      }
+
+      // Within 8 days → show "-X d hh:mm:ss"
+      const todayStart = new Date(now.getFullYear(), now.getMonth(), now.getDate());
+      const dStart = new Date(d.getFullYear(), d.getMonth(), d.getDate());
+      const diffDays = Math.round((todayStart - dStart) / 86400000);
+      if (diffDays < 8) {
+        return `-${diffDays}d ${timeStr}`;
+      }
+
+      // Older → date only
+      return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}`;
     }
 
     function update_table(data) {
@@ -317,6 +458,11 @@
         setup();
       }
       
+      // Update name cell (version indicator)
+      var nameCell = name_idx[data.name].cells[0];
+      nameCell.dataset.name = data.name;
+      nameCell.innerHTML = hostNameHtml(data);
+
       // Update warning and critical counts in "x/y" format (unacked/acked)
       var warningUnacked = data.alert_warning_unacked || 0;
       var warningAcked = data.alert_warning_acked || 0;
@@ -337,13 +483,13 @@
 
       for  (var i = 0; i < data.connections.length; i++) {
         // Offset by 2 for the warning/critical count columns
-        name_idx[data.name].cells[3 + i * 4].innerHTML = data.connections[i].addr;
+        name_idx[data.name].cells[3 + i * 4].innerHTML = escHtml(data.connections[i].addr);
         name_idx[data.name].cells[6 + i * 4].innerHTML = formatTS(
           data.connections[i].statetime
         );
         if (data.connections[i].state == "up") {
           state = '<span class="state-up">up</span>';
-          latency = Number.parseFloat(data.connections[i].rtts[0]).toFixed(2);
+          latency = String(Math.round(Number.parseFloat(data.connections[i].rtts[0])));
         } else {
           if (data.connections[i].state == "unknown") {
             state = "";
@@ -357,13 +503,30 @@
             state = '<span class="state-overdue">overdue</span>';
             latency = "-";
           } else {
-            state = "<b>" + data.connections[i].state + "</b>";
+            state = "<b>" + escHtml(data.connections[i].state) + "</b>";
             latency = "-";
           }
         }
         name_idx[data.name].cells[4 + i * 4].innerHTML = state;
         name_idx[data.name].cells[5 + i * 4].innerHTML = latency;
       }
+      updateRowAlert(name_idx[data.name], data);
+    }
+
+    function applyLogFilters() {
+      var hostFilter = document.getElementById('filter-host').value.toLowerCase().trim();
+      var levelFilter = document.getElementById('filter-level').value;
+      var msgFilter = document.getElementById('filter-msg').value.toLowerCase().trim();
+      document.querySelectorAll('#messages .log-entry').forEach(function(entry) {
+        var show = true;
+        if (hostFilter && !(entry.dataset.host || '').toLowerCase().includes(hostFilter)) show = false;
+        if (levelFilter && entry.dataset.level !== levelFilter) show = false;
+        if (msgFilter) {
+          var msgEl = entry.querySelector('.log-msg');
+          if (!msgEl || !msgEl.textContent.toLowerCase().includes(msgFilter)) show = false;
+        }
+        entry.style.display = show ? '' : 'none';
+      });
     }
 
     function WS_Connect() {
@@ -394,7 +557,22 @@
             update_table(state.data);
           } else if (state.type == "message") {
             var msgs = document.getElementById("messages");
-            msgs.insertAdjacentHTML("afterbegin", "<div>" + state.data + "</div>");
+            var msg = state.data;
+            var _d = new Date(msg.ts * 1000);
+            function _p(n) { return n < 10 ? '0' + n : '' + n; }
+            var ts_str = _d.getFullYear() + '-' + _p(_d.getMonth()+1) + '-' + _p(_d.getDate())
+                       + ' ' + _p(_d.getHours()) + ':' + _p(_d.getMinutes()) + ':' + _p(_d.getSeconds());
+            var lvl = (msg.level || "INFO").toLowerCase();
+            var hostVal = msg.host || '';
+            var html = '<div class="log-entry log-' + escHtml(lvl) + '" data-level="' + escHtml(lvl) + '" data-host="' + escHtml(hostVal) + '">';
+            html += '<span class="log-ts">' + ts_str + '</span>';
+            html += '<span class="log-level">' + escHtml(msg.level || "") + '</span>';
+            if (msg.host) html += '<span class="log-host">' + escHtml(msg.host) + '</span>';
+            if (msg.service) html += '<span class="log-service">' + escHtml(msg.service) + '</span>';
+            html += '<span class="log-msg">' + escHtml(msg.message) + '</span>';
+            html += '</div>';
+            msgs.insertAdjacentHTML(state.history ? "beforeend" : "afterbegin", html);
+            applyLogFilters();
           }
           cnt++;
         };
@@ -419,17 +597,15 @@
     WS_Connect();
   </script>
   <body>
-    <div class="nav">
+    {% include 'nav.html' %}
-      <a href="/live" class="active">Live Dashboard</a>
-      <a href="/plugins">Plugin Metrics</a>
-      <a href="/alerts">Alerts</a>
-    </div>
 
     {% include 'menu.html' %}
 
     <div class="container">
-      <h1>{{ header }}</h1>
+      <div>
-      <p class="subtitle">Real-time host monitoring and event log</p>
+        <h1>{{ header }}</h1>
+        <p class="subtitle">Real-time host monitoring and event log</p>
+      </div>
       
       <div class="table-section">
         <table id="ntable" class="sortable">
@@ -450,8 +626,8 @@
           </thead>
           <tbody id="ntablebody">
             {% for host in hosts %}
-            <tr>
+            <tr class="{% if host.alert_critical_unacked > 0 or host.alert_critical_acked > 0 %}row-critical{% elif host.alert_warning_unacked > 0 or host.alert_warning_acked > 0 %}row-warning{% endif %}">
-              <td>{{ host.name }}</td>
+              <td data-name="{{ host.name }}"><a class="host-link" href="/plugins#{{ host.name | urlencode }}">{{ host.name }}{% if not host.hbc_version or host.hbc_version != hbd_version %} 🥀{% endif %}</a></td>
               <td style="text-align: center; color: #ff9800; font-weight: bold;">
                 {%- set warning_unacked = host.alert_warning_unacked -%}
                 {%- set warning_acked = host.alert_warning_acked -%}
@@ -485,7 +661,21 @@
       </div>
       
       <div class="log-section">
-        <h2>Log of Events</h2>
+        <div class="log-section-header">
+          <span class="log-section-title">Log of Events</span>
+          <div class="log-filter-bar">
+            <input type="text" id="filter-host" placeholder="Host…" title="Filter by host" />
+            <select id="filter-level" title="Filter by level">
+              <option value="">All levels</option>
+              <option value="info">INFO</option>
+              <option value="warning">WARNING</option>
+              <option value="critical">CRITICAL</option>
+              <option value="recover">RECOVER</option>
+              <option value="unknown">UNKNOWN</option>
+            </select>
+            <input type="text" id="filter-msg" placeholder="Message…" title="Filter by message text" />
+          </div>
+        </div>
         <div id="messages"></div>
       </div>
     </div>
@@ -501,6 +691,9 @@
     
     <script>
       setup();
+      document.getElementById('filter-host').addEventListener('input', applyLogFilters);
+      document.getElementById('filter-level').addEventListener('change', applyLogFilters);
+      document.getElementById('filter-msg').addEventListener('input', applyLogFilters);
     </script>
   </body>
 </html>

hbd/server/templates/menu.html

@@ -1,3 +1,2 @@
 <!-- <label for="drawer-toggle" id="drawer-toggle-label"></label>
 s<header>{{ header }}</header> -->
-

hbd/server/templates/nav.html

@@ -0,0 +1,134 @@
+<div class="nav">
+  <button class="nav-hamburger" id="nav-hamburger-btn" aria-label="Menu" aria-expanded="false">
+    <span></span><span></span><span></span>
+  </button>
+  <div class="nav-links" id="nav-links">
+    <a href="/live"{% if active_page == "live" %} class="active"{% endif %}>Live Dashboard</a>
+    <a href="/plugins"{% if active_page == "plugins" %} class="active"{% endif %}>Host Overview</a>
+    <a href="/alerts"{% if active_page == "alerts" %} class="active"{% endif %}>Alerts</a>
+    {% if current_user and current_user.admin %}
+    <a href="/settings"{% if active_page == "settings" %} class="active"{% endif %}>Settings</a>
+    {% endif %}
+    <a href="/about"{% if active_page == "about" %} class="active"{% endif %}>About</a>
+  </div>
+  {% if current_user and current_user.admin %}
+  <button id="nav-publish-btn" class="nav-publish-btn" onclick="navPublishConfig()" style="display:none" title="Publish pending config changes to .hb.yaml">&#9888; Publish Config</button>
+  {% endif %}
+  <div class="nav-pie" title="Host alert status">
+    <canvas id="alert-pie" width="44" height="44"></canvas>
+  </div>
+  <div class="nav-clock" title="Click for full-screen clock">
+    <canvas id="swiss-clock" width="44" height="44"></canvas>
+  </div>
+  {% if current_user %}
+  <a href="/profile" class="nav-user{% if active_page == 'profile' %} active{% endif %}" title="{{ current_user.full_name or current_user.username }}">
+    {% if current_user.avatar %}
+    <img class="nav-avatar" src="{{ current_user.avatar_url }}" alt="{{ current_user.full_name or current_user.username }}">
+    {% else %}
+    <span class="nav-initials">{{ (current_user.full_name or current_user.username)[:1] | upper }}</span>
+    {% endif %}
+    <span class="nav-username">{{ current_user.full_name or current_user.username }}</span>
+  </a>
+  {% endif %}
+</div>
+
+<!-- Full-page clock overlay (click anywhere to dismiss) -->
+<div id="clock-overlay">
+  <canvas id="swiss-clock-overlay" width="400" height="400"></canvas>
+</div>
+
+<script>
+  (function() {
+    var btn = document.getElementById('nav-hamburger-btn');
+    var links = document.getElementById('nav-links');
+    if (btn && links) {
+      btn.addEventListener('click', function() {
+        var open = links.classList.toggle('nav-open');
+        btn.setAttribute('aria-expanded', open ? 'true' : 'false');
+      });
+    }
+  })();
+
+  function drawAlertPie(critical, warning, ok) {
+    var canvas = document.getElementById('alert-pie');
+    if (!canvas) return;
+    var ctx = canvas.getContext('2d');
+    var SIZE = canvas.width;
+    var R = SIZE / 2;
+    ctx.clearRect(0, 0, SIZE, SIZE);
+    var total = critical + warning + ok;
+    if (total === 0) {
+      ctx.beginPath();
+      ctx.arc(R, R, R - 1, 0, Math.PI * 2);
+      ctx.fillStyle = '#ccc';
+      ctx.fill();
+      return;
+    }
+    var slices = [
+      { value: critical, color: '#e53935' },
+      { value: warning,  color: '#ffb300' },
+      { value: ok,       color: '#43a047' }
+    ];
+    var start = -Math.PI / 2;
+    slices.forEach(function(s) {
+      if (s.value === 0) return;
+      var sweep = (s.value / total) * Math.PI * 2;
+      ctx.beginPath();
+      ctx.moveTo(R, R);
+      ctx.arc(R, R, R - 1, start, start + sweep);
+      ctx.closePath();
+      ctx.fillStyle = s.color;
+      ctx.fill();
+      start += sweep;
+    });
+  }
+
+  function updateAlertPie() {
+    fetch('/api/0/alert_summary').then(function(r) {
+      if (!r.ok) return;
+      return r.json();
+    }).then(function(d) {
+      if (d) drawAlertPie(d.critical || 0, d.warning || 0, d.ok || 0);
+    }).catch(function() {});
+  }
+
+  document.addEventListener('DOMContentLoaded', function() {
+    updateAlertPie();
+    setInterval(updateAlertPie, 30000);
+    navCheckPendingConfig();
+    window.addEventListener('storage', navCheckPendingConfig);
+  });
+
+  function navCheckPendingConfig() {
+    var btn = document.getElementById('nav-publish-btn');
+    if (!btn) return;
+    btn.style.display = localStorage.getItem('hbd_pending_config') ? '' : 'none';
+  }
+
+  async function navPublishConfig() {
+    var btn = document.getElementById('nav-publish-btn');
+    var pending = localStorage.getItem('hbd_pending_config');
+    if (!pending) return;
+    var staged;
+    try { staged = JSON.parse(pending); } catch(e) { return; }
+    if (btn) { btn.disabled = true; btn.textContent = 'Saving…'; }
+    try {
+      var resp = await fetch('/api/0/config', {
+        method: 'POST',
+        headers: {'Content-Type': 'application/json'},
+        body: pending
+      });
+      if (resp.ok) {
+        localStorage.removeItem('hbd_pending_config');
+        window.location.reload();
+      } else {
+        var err = await resp.json().catch(function() { return {}; });
+        alert('Error: ' + (err.error || resp.statusText));
+        if (btn) { btn.disabled = false; btn.textContent = '⚠ Publish Config'; }
+      }
+    } catch(e) {
+      alert('Network error: ' + e.message);
+      if (btn) { btn.disabled = false; btn.textContent = '⚠ Publish Config'; }
+    }
+  }
+</script>

hbd/server/templates/profile.html

@@ -0,0 +1,842 @@
+<!DOCTYPE html>
+<html>
+  {% include 'head.html' %}
+
+  <style>
+    html, body { overflow: visible; }
+
+    .container {
+      max-width: 900px;
+      margin: 0 auto;
+    }
+
+    h1 {
+      color: #333;
+      margin-bottom: 4px;
+      font-size: 1.5em;
+    }
+
+    .subtitle {
+      color: #666;
+      margin-bottom: 24px;
+      font-size: 0.9em;
+    }
+
+    /* ---- Profile card ---- */
+    .profile-card {
+      background: #fff;
+      border-radius: 8px;
+      box-shadow: 0 1px 6px rgba(0,0,0,0.1);
+      padding: 28px 32px;
+      margin-bottom: 24px;
+      display: flex;
+      align-items: center;
+      gap: 28px;
+    }
+
+    .avatar-large {
+      width: 80px;
+      height: 80px;
+      border-radius: 50%;
+      object-fit: cover;
+      flex-shrink: 0;
+      box-shadow: 0 2px 8px rgba(0,0,0,0.15);
+    }
+
+    .avatar-initials-large {
+      width: 80px;
+      height: 80px;
+      border-radius: 50%;
+      background: #0066cc;
+      color: #fff;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      font-size: 2em;
+      font-weight: 700;
+      flex-shrink: 0;
+      box-shadow: 0 2px 8px rgba(0,0,0,0.15);
+    }
+
+    .profile-info { flex: 1; }
+
+    .profile-name {
+      font-size: 1.4em;
+      font-weight: 700;
+      color: #222;
+      margin-bottom: 4px;
+    }
+
+    .profile-username {
+      font-size: 0.9em;
+      color: #666;
+      margin-bottom: 10px;
+    }
+
+    .badge {
+      display: inline-block;
+      padding: 2px 10px;
+      border-radius: 12px;
+      font-size: 0.78em;
+      font-weight: 600;
+      text-transform: uppercase;
+      letter-spacing: 0.4px;
+    }
+
+    .badge-admin { background: #e8f0fe; color: #1a73e8; }
+    .badge-user  { background: #f1f3f4; color: #555; }
+
+    .profile-logout {
+      margin-top: 14px;
+    }
+
+    .btn-logout {
+      display: inline-block;
+      padding: 6px 16px;
+      border-radius: 4px;
+      background: #f44336;
+      color: #fff;
+      font-size: 1.00em;
+      font-weight: 500;
+      text-decoration: none;
+      transition: background 0.15s;
+    }
+    .btn-logout:hover { background: #d32f2f; text-decoration: none; }
+
+    /* ---- Section cards ---- */
+    .section {
+      background: #fff;
+      border-radius: 8px;
+      box-shadow: 0 1px 6px rgba(0,0,0,0.1);
+      padding: 20px 24px;
+      margin-bottom: 20px;
+    }
+
+    .section h2 {
+      font-size: 1em;
+      font-weight: 700;
+      color: #333;
+      margin: 0 0 16px;
+      padding-bottom: 10px;
+      border-bottom: 1px solid #eee;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
+    }
+
+    /* ---- Settings rows ---- */
+    .settings-row {
+      display: flex;
+      align-items: baseline;
+      padding: 8px 0;
+      border-bottom: 1px solid #f5f5f5;
+      font-size: 0.9em;
+    }
+    .settings-row:last-child { border-bottom: none; }
+
+    .settings-label {
+      width: 180px;
+      flex-shrink: 0;
+      color: #666;
+      font-size: 0.88em;
+    }
+
+    .settings-value { color: #222; }
+
+    .settings-empty { color: #aaa; font-style: italic; }
+
+    /* ---- Host lists ---- */
+    .host-grid {
+      display: flex;
+      flex-wrap: wrap;
+      gap: 8px;
+    }
+
+    .host-chip {
+      display: inline-flex;
+      align-items: center;
+      gap: 6px;
+      padding: 4px 12px;
+      border-radius: 16px;
+      font-size: 1.00em;
+      font-weight: 500;
+      text-decoration: none;
+    }
+
+    .host-chip.owner   { background: #e8f5e9; color: #2e7d32; }
+    .host-chip.manager { background: #e3f2fd; color: #1565c0; }
+    .host-chip.monitor { background: #f3e5f5; color: #6a1b9a; }
+
+    .host-chip-dot {
+      width: 7px; height: 7px; border-radius: 50%;
+    }
+    .owner   .host-chip-dot { background: #2e7d32; }
+    .manager .host-chip-dot { background: #1565c0; }
+    .monitor .host-chip-dot { background: #6a1b9a; }
+
+    .no-hosts {
+      color: #aaa;
+      font-size: 0.9em;
+      font-style: italic;
+    }
+
+    /* ---- Notification channels ---- */
+    .channel-row {
+      display: flex;
+      align-items: center;
+      gap: 10px;
+      padding: 6px 0;
+      border-bottom: 1px solid #f5f5f5;
+      font-size: 0.9em;
+    }
+    .channel-row:last-child { border-bottom: none; }
+
+    .channel-type {
+      display: inline-block;
+      padding: 2px 8px;
+      border-radius: 10px;
+      font-size: 0.78em;
+      font-weight: 600;
+      text-transform: uppercase;
+      background: #f1f3f4;
+      color: #555;
+      min-width: 70px;
+      text-align: center;
+    }
+
+    .channel-name { color: #333; }
+
+    .edit-section { margin-top: 20px; }
+    .edit-section h4 { font-size: .88em; font-weight: 600; color: #333; margin: 0 0 10px; text-transform: uppercase; letter-spacing: .04em; border-bottom: 1px solid #eee; padding-bottom: 6px; }
+    .edit-field { margin-bottom: 10px; }
+    .edit-field label { display: block; font-size: .82em; color: #666; margin-bottom: 3px; }
+    .edit-input { width: 100%; border: 1px solid #ccc; border-radius: 4px; padding: 5px 8px; font-size: .88em; box-sizing: border-box; }
+    .edit-input:focus { border-color: #0066cc; outline: none; }
+    .status-msg { font-size: .82em; margin-left: 8px; }
+    .save-row { display: flex; align-items: center; margin-top: 8px; }
+    .btn-save { background: #0066cc; color: #fff; border: none; border-radius: 4px; padding: 5px 14px; font-size: .85em; cursor: pointer; }
+    .btn-save:hover { background: #0055aa; }
+    /* ---- Channel chip picker ---- */
+    .ch-picker { }
+    .ch-picker-label { font-size: .8em; font-weight: 600; color: #888; text-transform: uppercase; letter-spacing: .04em; margin-bottom: 6px; }
+    .ch-chips { display: flex; flex-wrap: wrap; gap: 6px; min-height: 32px; margin-bottom: 10px; }
+    .ch-chip {
+      display: inline-flex; align-items: center; gap: 5px;
+      padding: 4px 10px; border-radius: 14px; font-size: .85em; font-weight: 500; cursor: pointer;
+      border: none; font-family: inherit;
+    }
+    .ch-chip.selected { background: #e3f2fd; color: #1565c0; }
+    .ch-chip.selected:hover { background: #bbdefb; }
+    .ch-chip.available { background: #f1f3f4; color: #555; }
+    .ch-chip.available:hover { background: #e8eaf6; color: #283593; }
+    .ch-chip-x { font-size: .9em; line-height: 1; color: inherit; opacity: .7; }
+
+    /* ---- My Channels card list ---- */
+    .my-ch-card {
+      border: 1px solid #e8eaf6; border-radius: 6px; margin-bottom: 8px; overflow: hidden;
+    }
+    .my-ch-header {
+      display: flex; align-items: center; gap: 8px; padding: 8px 12px;
+      background: #f8f9ff; border-bottom: 1px solid #e8eaf6;
+    }
+    .my-ch-name { font-weight: 600; font-size: .9em; color: #222; }
+    .my-ch-type { padding: 2px 7px; border-radius: 8px; font-size: .72em; font-weight: 600; background: #e8eaf6; color: #3949ab; }
+    .my-ch-private { padding: 2px 7px; border-radius: 8px; font-size: .72em; font-weight: 600; background: #fce4ec; color: #c62828; }
+    .my-ch-actions { margin-left: auto; display: flex; gap: 5px; }
+    .btn-sm-edit { background: #888; color: #fff; border: none; border-radius: 4px; padding: 2px 8px; font-size: .78em; cursor: pointer; }
+    .btn-sm-edit:hover { background: #666; }
+    .btn-sm-del { background: transparent; color: #c62828; border: 1px solid #e0e0e0; border-radius: 4px; padding: 2px 7px; font-size: .78em; cursor: pointer; }
+    .btn-sm-del:hover { background: #fce4ec; }
+
+    /* ---- Theme picker ---- */
+    .theme-btns { display: flex; gap: 6px; }
+    .theme-btn {
+      padding: 5px 14px;
+      border: 1px solid var(--border, #e0e0e0);
+      border-radius: 4px;
+      background: var(--surface-3, #f5f5f5);
+      color: var(--text-sec, #666);
+      cursor: pointer;
+      font-size: .88em;
+      font-family: inherit;
+    }
+    .theme-btn:hover { border-color: var(--link, #0066cc); color: var(--link, #0066cc); }
+    .theme-btn.active { background: var(--link, #0066cc); color: #fff; border-color: var(--link, #0066cc); }
+
+    /* ── Dark mode ── */
+    html[data-theme="dark"] h1 { color: var(--text); }
+    html[data-theme="dark"] .subtitle { color: var(--text-sec); }
+    html[data-theme="dark"] .profile-card { background: var(--surface); box-shadow: 0 1px 6px var(--shadow); }
+    html[data-theme="dark"] .profile-name { color: var(--text); }
+    html[data-theme="dark"] .profile-username { color: var(--text-sec); }
+    html[data-theme="dark"] .badge-admin { background: #1a3255; color: #7aa8f0; }
+    html[data-theme="dark"] .badge-user  { background: var(--surface-3); color: var(--text-sec); }
+    html[data-theme="dark"] .section { background: var(--surface); box-shadow: 0 1px 6px var(--shadow); }
+    html[data-theme="dark"] .section h2 { color: var(--text); border-bottom-color: var(--border); }
+    html[data-theme="dark"] .settings-row { border-bottom-color: var(--border-4); }
+    html[data-theme="dark"] .settings-label { color: var(--text-sec); }
+    html[data-theme="dark"] .settings-value { color: var(--text); }
+    html[data-theme="dark"] .settings-empty { color: var(--text-dim); }
+    html[data-theme="dark"] .edit-section h4 { color: var(--text); border-bottom-color: var(--border); }
+    html[data-theme="dark"] .edit-field label { color: var(--text-sec); }
+    html[data-theme="dark"] .edit-input { background: var(--input-bg); border-color: var(--input-border); color: var(--text); }
+    html[data-theme="dark"] .channel-row { border-bottom-color: var(--border-4); }
+    html[data-theme="dark"] .channel-name { color: var(--text); }
+    html[data-theme="dark"] .ch-picker-label { color: var(--text-sec); }
+    html[data-theme="dark"] .ch-chip.selected { background: #1a3255; color: #60a5fa; }
+    html[data-theme="dark"] .ch-chip.available { background: var(--surface-3); color: var(--text-sec); }
+    html[data-theme="dark"] .ch-chip.available:hover { background: var(--border); color: var(--link); }
+    html[data-theme="dark"] .my-ch-card { border-color: var(--border); }
+    html[data-theme="dark"] .my-ch-header { background: var(--surface-2); border-bottom-color: var(--border); }
+    html[data-theme="dark"] .my-ch-name { color: var(--text); }
+    html[data-theme="dark"] .host-chip.owner   { background: #0d2e17; color: #66bb6a; }
+    html[data-theme="dark"] .host-chip.manager { background: #0d1f40; color: #64b5f6; }
+    html[data-theme="dark"] .host-chip.monitor { background: #1e0d30; color: #ba68c8; }
+    html[data-theme="dark"] .no-hosts { color: var(--text-dim); }
+    html[data-theme="dark"] .ch-modal-box { background: var(--surface); color: var(--text); }
+    html[data-theme="dark"] .ch-modal-box h3 { color: var(--text); }
+    html[data-theme="dark"] .ch-form-row label { color: var(--text-sec); }
+    html[data-theme="dark"] .ch-form-divider { color: var(--text-muted); border-top-color: var(--border); }
+
+    /* ---- Channel modal (for My Channels CRUD) ---- */
+    .ch-modal-overlay {
+      position: fixed; inset: 0; background: rgba(0,0,0,.4);
+      display: flex; align-items: center; justify-content: center; z-index: 1001;
+    }
+    .ch-modal-box {
+      background: #fff; border-radius: 8px; padding: 24px;
+      min-width: 360px; max-width: 520px; width: 95%;
+      box-shadow: 0 8px 32px rgba(0,0,0,.2);
+    }
+    .ch-modal-box h3 { margin: 0 0 16px; font-size: 1em; }
+    .ch-form-row { margin-bottom: 12px; }
+    .ch-form-row label { display: block; font-size: .83em; font-weight: 600; color: #555; margin-bottom: 3px; }
+    .ch-form-row input[type=text], .ch-form-row input[type=password], .ch-form-row select {
+      width: 100%; border: 1px solid #ccc; border-radius: 4px; padding: 5px 8px;
+      font-size: .88em; box-sizing: border-box; font-family: inherit;
+    }
+    .ch-form-row input:focus, .ch-form-row select:focus { border-color: #0066cc; outline: none; }
+    .ch-form-divider { font-size: .78em; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: #888; margin: 14px 0 8px; border-top: 1px solid #eee; padding-top: 10px; }
+    .ch-modal-footer { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }
+    .ch-modal-status { font-size: .83em; margin-top: 8px; }
+  </style>
+
+  <body>
+    {% include 'nav.html' %}
+
+    <div class="container">
+      <h1>{{ header }}</h1>
+      <p class="subtitle">Your account settings and host access</p>
+
+      <!-- Profile card -->
+      <div class="profile-card">
+        {% if current_user and current_user.avatar %}
+        <img class="avatar-large" src="{{ current_user.avatar_url }}" alt="">
+        {% else %}
+        <div class="avatar-initials-large">
+          {{ ((current_user.full_name if current_user else '') or (current_user.username if current_user else '?'))[:1] | upper }}
+        </div>
+        {% endif %}
+
+        <div class="profile-info">
+          <div class="profile-name">{{ current_user.full_name if current_user and current_user.full_name else (current_user.username if current_user else '—') }}</div>
+          <div class="profile-username">@{{ current_user.username if current_user else '—' }}</div>
+          {% if current_user and current_user.admin %}
+          <span class="badge badge-admin">Admin</span>
+          {% else %}
+          <span class="badge badge-user">User</span>
+          {% endif %}
+          <div class="profile-logout">
+            <a href="/logout" class="btn-logout">Sign out</a>
+          </div>
+        </div>
+      </div>
+
+      <!-- Account settings -->
+      <div class="section">
+        <h2>Account</h2>
+        <div class="settings-row">
+          <span class="settings-label">Username</span>
+          <span class="settings-value">{{ current_user.username if current_user else '—' }}</span>
+        </div>
+        <div class="settings-row">
+          <span class="settings-label">Full name</span>
+          {% if current_user and current_user.full_name %}
+          <span class="settings-value">{{ current_user.full_name }}</span>
+          {% else %}
+          <span class="settings-empty">Not set</span>
+          {% endif %}
+        </div>
+        <div class="settings-row">
+          <span class="settings-label">Role</span>
+          <span class="settings-value">{{ 'Administrator' if current_user and current_user.admin else 'User' }}</span>
+        </div>
+        <div class="settings-row">
+          <span class="settings-label">Avatar</span>
+          {% if current_user and current_user.avatar %}
+          <span class="settings-value" style="word-break:break-all;">{{ current_user.avatar }}</span>
+          {% else %}
+          <span class="settings-empty">Not set (initials used)</span>
+          {% endif %}
+        </div>
+      </div>
+
+      {% if current_user %}
+      <!-- ---- Editable identity ---- -->
+      <div class="section edit-section">
+        <h4>Identity</h4>
+        <div class="edit-field">
+          <label for="profile-fullname">Display name</label>
+          <input id="profile-fullname" class="edit-input" type="text" value="{{ current_user.full_name | e }}" placeholder="Full name">
+        </div>
+        <div class="edit-field">
+          <label for="profile-avatar">Avatar URL or path</label>
+          <input id="profile-avatar" class="edit-input" type="text" value="{{ current_user.avatar | e }}" placeholder="/path/to/avatar.png or https://…">
+        </div>
+        <div class="save-row">
+          <button class="btn-save" onclick="saveIdentity()">Save</button>
+          <span id="identity-status" class="status-msg"></span>
+        </div>
+      </div>
+
+      <!-- ---- Change password ---- -->
+      <div class="section edit-section">
+        <h4>Change password</h4>
+        <div class="edit-field">
+          <label for="profile-current-pw">Current password</label>
+          <input id="profile-current-pw" class="edit-input" type="password" autocomplete="current-password">
+        </div>
+        <div class="edit-field">
+          <label for="profile-new-pw">New password</label>
+          <input id="profile-new-pw" class="edit-input" type="password" autocomplete="new-password">
+        </div>
+        <div class="save-row">
+          <button class="btn-save" onclick="changePassword()">Change password</button>
+          <span id="password-status" class="status-msg"></span>
+        </div>
+      </div>
+      {% endif %}
+
+      <!-- Notification channels — chip picker -->
+      <div class="section">
+        <h2>Notification Channels</h2>
+        {% if current_user %}
+        <p style="font-size:.82em;color:#888;margin:0 0 12px">Click a channel to add or remove it from your alert list.</p>
+        {% if all_channels %}
+        <div class="ch-picker">
+          <div class="ch-picker-label">Selected</div>
+          <div id="selected-chips" class="ch-chips">
+            {% for ch in all_channels %}
+            {% if ch.name in (current_user.notification_channels or []) %}
+            <button class="ch-chip selected" data-ch="{{ ch.name | e }}" onclick="toggleChip(this)">
+              {{ ch.name | e }} <span class="ch-chip-x">×</span>
+            </button>
+            {% endif %}
+            {% endfor %}
+            {% set selected_set = current_user.notification_channels or [] %}
+            {% set has_selected = selected_set | length > 0 %}
+            {% if not has_selected %}
+            <span style="font-size:.83em;color:#bbb;font-style:italic;align-self:center">None selected</span>
+            {% endif %}
+          </div>
+          <div class="ch-picker-label">Available</div>
+          <div id="available-chips" class="ch-chips">
+            {% for ch in all_channels %}
+            {% if ch.name not in (current_user.notification_channels or []) %}
+            <button class="ch-chip available" data-ch="{{ ch.name | e }}" onclick="toggleChip(this)">
+              + {{ ch.name | e }}
+            </button>
+            {% endif %}
+            {% endfor %}
+          </div>
+        </div>
+        {% else %}
+        <p style="font-size:.83em;color:#bbb;font-style:italic">No notification channels available. You can create your own below.</p>
+        {% endif %}
+        <div class="save-row">
+          <button class="btn-save" onclick="saveChannels()">Save channels</button>
+          <span id="channels-status" class="status-msg"></span>
+        </div>
+        {% else %}
+        <span class="no-hosts">Log in to manage notification channels.</span>
+        {% endif %}
+      </div>
+
+      <!-- My Channels — create/edit/delete own channels -->
+      {% if current_user %}
+      <div class="section">
+        <h2>My Channels</h2>
+        <p style="font-size:.82em;color:#888;margin:0 0 12px">Channels you own. Public channels are available to all users; private channels are visible only to you.</p>
+        <div id="my-channels-list">
+          {% set my_channels = all_channels | selectattr('owner', 'equalto', current_user.username) | list %}
+          {% for ch in my_channels %}
+          <div class="my-ch-card" id="mychcard-{{ ch.name | e }}">
+            <div class="my-ch-header">
+              <span class="my-ch-name">{{ ch.name | e }}</span>
+              <span class="my-ch-type">{{ ch.type | e }}</span>
+              {% if ch.private %}<span class="my-ch-private">private</span>{% endif %}
+              <span class="my-ch-actions">
+                <button class="btn-sm-edit" onclick="openMyChModal('{{ ch.name | e }}')">Edit</button>
+                <button class="btn-sm-del" onclick="deleteMyChannel('{{ ch.name | e }}')">✕</button>
+              </span>
+            </div>
+          </div>
+          {% endfor %}
+          {% if not my_channels %}
+          <p id="my-channels-empty" style="font-size:.83em;color:#bbb;font-style:italic">No channels yet.</p>
+          {% endif %}
+        </div>
+        <div class="save-row" style="margin-top:8px">
+          <button class="btn-save" onclick="openMyChModal()">+ New channel</button>
+        </div>
+      </div>
+
+      <!-- My Channels modal -->
+      <div id="my-ch-modal" class="ch-modal-overlay" style="display:none" onclick="if(event.target===this)closeMyChModal()">
+        <div class="ch-modal-box">
+          <h3 id="my-ch-modal-title">New Channel</h3>
+          <div class="ch-form-row">
+            <label>Channel name</label>
+            <input type="text" id="my-ch-name" placeholder="e.g. my_pushover" autocomplete="off">
+          </div>
+          <div class="ch-form-row">
+            <label>Type</label>
+            <select id="my-ch-type" onchange="onMyChTypeChange()">
+              <option value="">— select —</option>
+            </select>
+          </div>
+          <div id="my-ch-type-fields"></div>
+          <div class="ch-form-divider">Options</div>
+          <div class="ch-form-row">
+            <label>Minimum alert level</label>
+            <select id="my-ch-min-level">
+              <option value="WARNING">WARNING (and above)</option>
+              <option value="CRITICAL">CRITICAL only</option>
+            </select>
+          </div>
+          <div class="ch-form-row">
+            <label style="display:flex;align-items:center;gap:6px;cursor:pointer">
+              <input type="checkbox" id="my-ch-private"> Private — visible only to you
+            </label>
+          </div>
+          <div id="my-ch-modal-status" class="ch-modal-status"></div>
+          <div class="ch-modal-footer">
+            <button class="btn-save" style="background:#888" onclick="closeMyChModal()">Cancel</button>
+            <button class="btn-save" onclick="saveMyChannel()">Save</button>
+          </div>
+        </div>
+      </div>
+      {% endif %}
+
+      <!-- Appearance -->
+      <div class="section">
+        <h2>Appearance</h2>
+        <div class="settings-row">
+          <span class="settings-label">Theme</span>
+          <div class="theme-btns">
+            <button class="theme-btn" data-theme-val="auto"  onclick="setTheme('auto')">Auto</button>
+            <button class="theme-btn" data-theme-val="light" onclick="setTheme('light')">Light</button>
+            <button class="theme-btn" data-theme-val="dark"  onclick="setTheme('dark')">Dark</button>
+          </div>
+        </div>
+      </div>
+
+      <!-- Host access -->
+      <div class="section">
+        <h2>Host Access</h2>
+
+        <div class="settings-row" style="align-items: flex-start; padding-bottom: 14px;">
+          <span class="settings-label" style="padding-top: 2px;">Owner</span>
+          <div class="host-grid">
+            {% if owned_hosts %}
+            {% for h in owned_hosts %}
+            <span class="host-chip owner"><span class="host-chip-dot"></span>{{ h }}</span>
+            {% endfor %}
+            {% else %}
+            <span class="no-hosts">None</span>
+            {% endif %}
+          </div>
+        </div>
+
+        <div class="settings-row" style="align-items: flex-start; padding-bottom: 14px;">
+          <span class="settings-label" style="padding-top: 2px;">Manager</span>
+          <div class="host-grid">
+            {% if managed_hosts %}
+            {% for h in managed_hosts %}
+            <span class="host-chip manager"><span class="host-chip-dot"></span>{{ h }}</span>
+            {% endfor %}
+            {% else %}
+            <span class="no-hosts">None</span>
+            {% endif %}
+          </div>
+        </div>
+
+        <div class="settings-row" style="align-items: flex-start; padding-bottom: 4px;">
+          <span class="settings-label" style="padding-top: 2px;">Monitor</span>
+          <div class="host-grid">
+            {% if monitored_hosts %}
+            {% for h in monitored_hosts %}
+            <span class="host-chip monitor"><span class="host-chip-dot"></span>{{ h }}</span>
+            {% endfor %}
+            {% else %}
+            <span class="no-hosts">None</span>
+            {% endif %}
+          </div>
+        </div>
+      </div>
+
+    </div>
+    <script>
+      // ---- Theme ----
+      function applyTheme(pref) {
+        var dark = pref === 'dark' ||
+          (pref === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches);
+        if (dark) { document.documentElement.setAttribute('data-theme', 'dark'); }
+        else { document.documentElement.removeAttribute('data-theme'); }
+      }
+      function setTheme(pref) {
+        try { localStorage.setItem('hbd_theme', pref); } catch(e) {}
+        applyTheme(pref);
+        document.querySelectorAll('.theme-btn').forEach(function(b) {
+          b.classList.toggle('active', b.dataset.themeVal === pref);
+        });
+      }
+      (function() {
+        var pref = 'auto';
+        try { pref = localStorage.getItem('hbd_theme') || 'auto'; } catch(e) {}
+        document.querySelectorAll('.theme-btn').forEach(function(b) {
+          b.classList.toggle('active', b.dataset.themeVal === pref);
+        });
+      })();
+
+      // ---- Identity ----
+      async function saveIdentity() {
+        const full_name = document.getElementById('profile-fullname').value;
+        const avatar = document.getElementById('profile-avatar').value;
+        const resp = await fetch('/api/0/users/me', {
+          method: 'PUT',
+          headers: {'Content-Type': 'application/json'},
+          body: JSON.stringify({full_name, avatar}),
+        });
+        if (resp.ok) {
+          showStatus('identity-status', 'Saved', '#2e7d32');
+        } else {
+          const err = await resp.json().catch(() => ({}));
+          showStatus('identity-status', err.error || 'Error saving', '#c62828');
+        }
+      }
+
+      // ---- Password ----
+      async function changePassword() {
+        const current = document.getElementById('profile-current-pw').value;
+        const newpw = document.getElementById('profile-new-pw').value;
+        if (!current || !newpw) {
+          showStatus('password-status', 'Both fields are required', '#c62828');
+          return;
+        }
+        const resp = await fetch('/api/0/users/me', {
+          method: 'PUT',
+          headers: {'Content-Type': 'application/json'},
+          body: JSON.stringify({password: {current, new: newpw}}),
+        });
+        if (resp.ok) {
+          document.getElementById('profile-current-pw').value = '';
+          document.getElementById('profile-new-pw').value = '';
+          showStatus('password-status', 'Password changed', '#2e7d32');
+        } else {
+          const err = await resp.json().catch(() => ({}));
+          showStatus('password-status', err.error || 'Error', '#c62828');
+        }
+      }
+
+      // ---- Channel chip picker ----
+      function toggleChip(btn) {
+        const name = btn.dataset.ch;
+        const isSelected = btn.classList.contains('selected');
+        if (isSelected) {
+          // Move to available
+          btn.classList.remove('selected');
+          btn.classList.add('available');
+          btn.innerHTML = '+ ' + escHtml(name);
+          btn.onclick = function() { toggleChip(this); };
+          document.getElementById('available-chips').appendChild(btn);
+          // Remove "None selected" placeholder if it exists
+        } else {
+          // Move to selected
+          btn.classList.remove('available');
+          btn.classList.add('selected');
+          btn.innerHTML = escHtml(name) + ' <span class="ch-chip-x">×</span>';
+          btn.onclick = function() { toggleChip(this); };
+          document.getElementById('selected-chips').appendChild(btn);
+        }
+        // Update placeholder visibility
+        const sel = document.getElementById('selected-chips');
+        const placeholder = sel.querySelector('span[style]');
+        const hasChips = sel.querySelectorAll('.ch-chip.selected').length > 0;
+        if (placeholder) placeholder.style.display = hasChips ? 'none' : '';
+      }
+
+      async function saveChannels() {
+        const notification_channels = [
+          ...document.querySelectorAll('#selected-chips .ch-chip.selected')
+        ].map(b => b.dataset.ch);
+        const resp = await fetch('/api/0/users/me', {
+          method: 'PUT',
+          headers: {'Content-Type': 'application/json'},
+          body: JSON.stringify({notification_channels}),
+        });
+        if (resp.ok) {
+          showStatus('channels-status', 'Saved', '#2e7d32');
+        } else {
+          const err = await resp.json().catch(() => ({}));
+          showStatus('channels-status', err.error || 'Error saving', '#c62828');
+        }
+      }
+
+      // ---- My Channels CRUD ----
+      let _myChSchemas = {};
+      let _myChEditName = null;
+
+      async function _loadMyChSchemas() {
+        try {
+          const r = await fetch('/api/0/notification_channel_types');
+          _myChSchemas = await r.json();
+          const sel = document.getElementById('my-ch-type');
+          if (!sel) return;
+          Object.entries(_myChSchemas).forEach(([k, v]) => {
+            const opt = document.createElement('option');
+            opt.value = k; opt.textContent = v.label;
+            sel.appendChild(opt);
+          });
+        } catch(e) { console.warn('Could not load channel schemas', e); }
+      }
+
+      function onMyChTypeChange() {
+        const type = document.getElementById('my-ch-type').value;
+        const container = document.getElementById('my-ch-type-fields');
+        container.innerHTML = '';
+        if (!type || !_myChSchemas[type]) return;
+        const divider = document.createElement('div');
+        divider.className = 'ch-form-divider';
+        divider.textContent = _myChSchemas[type].label + ' settings';
+        container.appendChild(divider);
+        (_myChSchemas[type].fields || []).forEach(sf => {
+          const row = document.createElement('div');
+          row.className = 'ch-form-row';
+          const lbl = document.createElement('label');
+          lbl.textContent = sf.label + (sf.required ? ' *' : '');
+          const inp = document.createElement('input');
+          inp.type = sf.type === 'secret' ? 'password' : 'text';
+          inp.id = 'mychf-' + sf.key;
+          inp.placeholder = sf.required ? '(required)' : '(optional)';
+          inp.autocomplete = 'off';
+          row.appendChild(lbl);
+          row.appendChild(inp);
+          container.appendChild(row);
+        });
+      }
+
+      async function openMyChModal(name) {
+        _myChEditName = name || null;
+        document.getElementById('my-ch-modal-status').textContent = '';
+        document.getElementById('my-ch-modal-title').textContent = name ? 'Edit Channel' : 'New Channel';
+        document.getElementById('my-ch-name').value = name || '';
+        document.getElementById('my-ch-name').disabled = !!name;
+        document.getElementById('my-ch-type').value = '';
+        document.getElementById('my-ch-type-fields').innerHTML = '';
+        document.getElementById('my-ch-min-level').value = 'WARNING';
+        document.getElementById('my-ch-private').checked = false;
+
+        if (name) {
+          try {
+            const r = await fetch('/api/0/notification_channels');
+            const channels = await r.json();
+            const ch = channels.find(c => c.name === name);
+            if (ch) {
+              document.getElementById('my-ch-type').value = ch.type;
+              onMyChTypeChange();
+              document.getElementById('my-ch-min-level').value = ch.min_level || 'WARNING';
+              document.getElementById('my-ch-private').checked = ch.private || false;
+              (ch.fields || []).forEach(f => {
+                const inp = document.getElementById('mychf-' + f.key);
+                if (inp) inp.value = f.value || '';
+              });
+            }
+          } catch(e) { console.warn('Failed to load channel', e); }
+        }
+        document.getElementById('my-ch-modal').style.display = 'flex';
+      }
+
+      function closeMyChModal() {
+        document.getElementById('my-ch-modal').style.display = 'none';
+      }
+
+      async function saveMyChannel() {
+        const name = document.getElementById('my-ch-name').value.trim();
+        const type = document.getElementById('my-ch-type').value;
+        const minLevel = document.getElementById('my-ch-min-level').value;
+        const isPrivate = document.getElementById('my-ch-private').checked;
+        const statusEl = document.getElementById('my-ch-modal-status');
+        statusEl.textContent = '';
+
+        if (!name) { statusEl.textContent = 'Name is required.'; statusEl.style.color = '#c62828'; return; }
+        if (!type) { statusEl.textContent = 'Please select a type.'; statusEl.style.color = '#c62828'; return; }
+
+        const body = { name, type, min_level: minLevel, private: isPrivate };
+        if (_myChSchemas[type]) {
+          (_myChSchemas[type].fields || []).forEach(sf => {
+            const inp = document.getElementById('mychf-' + sf.key);
+            if (inp) body[sf.key] = inp.value;
+          });
+        }
+
+        const isEdit = !!_myChEditName;
+        const url = isEdit
+          ? '/api/0/notification_channels/' + encodeURIComponent(_myChEditName)
+          : '/api/0/notification_channels';
+        const method = isEdit ? 'PUT' : 'POST';
+        try {
+          const r = await fetch(url, { method, headers: {'Content-Type': 'application/json'}, body: JSON.stringify(body) });
+          if (r.ok) {
+            closeMyChModal();
+            window.location.reload();
+          } else {
+            const err = await r.json().catch(() => ({}));
+            statusEl.textContent = err.error || 'Error saving.';
+            statusEl.style.color = '#c62828';
+          }
+        } catch(e) {
+          statusEl.textContent = 'Network error: ' + e.message;
+          statusEl.style.color = '#c62828';
+        }
+      }
+
+      async function deleteMyChannel(name) {
+        if (!confirm('Delete channel "' + name + '"?')) return;
+        try {
+          const r = await fetch('/api/0/notification_channels/' + encodeURIComponent(name), { method: 'DELETE' });
+          if (r.ok) {
+            window.location.reload();
+          } else {
+            const err = await r.json().catch(() => ({}));
+            alert('Error: ' + (err.error || 'Could not delete.'));
+          }
+        } catch(e) { alert('Network error: ' + e.message); }
+      }
+
+      // ---- Utilities ----
+      function showStatus(id, msg, color) {
+        const el = document.getElementById(id);
+        if (!el) return;
+        el.textContent = msg;
+        el.style.color = color;
+        setTimeout(() => { el.textContent = ''; }, 3000);
+      }
+
+      function escHtml(s) {
+        return String(s).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
+      }
+
+      document.addEventListener('DOMContentLoaded', _loadMyChSchemas);
+    </script>
+  </body>
+</html>

hbd/server/udp.py

@@ -1,9 +1,14 @@
 """UDP listener and datagram processing."""
 
 import asyncio
+import socket
+import struct
+import time
 import zlib
 import logging
 
+from platform import system as platform_system
+
 from ..common.proto import stodict, oldmtodict
 from ..common.utils import dur
 from . import notify as notify_mod
@@ -11,6 +16,108 @@ from . import notify as notify_mod
 logger = logging.getLogger(__name__)
 eventlog = notify_mod.eventlog
 
+# SO_TIMESTAMP: kernel attaches a struct timeval to each received datagram.
+# Supported on Linux, FreeBSD, and macOS.  The constant is not exposed by
+# Python's socket module on all platforms 
+platform = platform_system()
+if platform == "Darwin":
+    _SO_TIMESTAMP = 1024  # SO_TIMESTAMP on macOS (not in Python's socket module)
+elif platform == "Linux":
+    _SO_TIMESTAMP = 29  # Linux value (not in older Python versions)
+elif platform == "FreeBSD":
+     _SO_TIMESTAMP = 32  # FreeBSD value (not in older Python versions)
+else:
+    logger.warning("SO_TIMESTAMP may not be supported on this platform (%s)", platform)
+    _SO_TIMESTAMP = None
+
+# struct timeval uses two native C longs: tv_sec and tv_usec
+_TIMEVAL = struct.Struct('@ll')
+
+
+def enable_kernel_timestamps(sock) -> bool:
+    """Try to enable SO_TIMESTAMP on *sock*.
+
+    Returns True if the kernel will supply receive timestamps, False otherwise
+    (unsupported platform, older kernel, or insufficient permissions).
+    """
+    try:
+        sock.setsockopt(socket.SOL_SOCKET, _SO_TIMESTAMP, 1)
+        return True
+    except OSError:
+        return False
+
+
+def _extract_kernel_ts(ancdata) -> float | None:
+    """Parse recvmsg ancillary data and return the kernel receive time.
+
+    Returns seconds as a float, or None if no SO_TIMESTAMP cmsg is present.
+    """
+    for cmsg_level, cmsg_type, cmsg_data in ancdata:
+        if cmsg_level == socket.SOL_SOCKET and cmsg_type == _SO_TIMESTAMP:
+            if len(cmsg_data) >= _TIMEVAL.size:
+                sec, usec = _TIMEVAL.unpack_from(cmsg_data)
+                return sec + usec * 1e-6
+    return None
+
+
+class RecvmsgTransport:
+    """Thin wrapper used when SO_TIMESTAMP is active (add_reader path).
+
+    Exposes the same sendto() / close() interface as asyncio's DatagramTransport
+    so the rest of the code does not need to know which path is in use.
+    """
+    def __init__(self, loop, sock):
+        self._loop = loop
+        self._sock = sock
+
+    def sendto(self, data, addr):
+        try:
+            self._sock.sendto(data, addr)
+        except Exception as e:
+            logger.debug("sendto failed: %s", e)
+
+    def close(self):
+        try:
+            self._loop.remove_reader(self._sock.fileno())
+        except Exception:
+            pass
+        try:
+            self._sock.close()
+        except Exception:
+            pass
+
+
+def make_recvmsg_reader(sock, handler, transport):
+    """Return a callback suitable for loop.add_reader().
+
+    Reads one datagram per call using recvmsg() so that kernel timestamps in
+    the ancillary data are accessible.  Falls back to time.time() if the
+    cmsg is missing.
+
+    handler(msg, addr, transport, kernel_ts) – same signature as udp_handler
+    in main.py with the optional kernel_ts argument.
+    """
+    BUFSIZE = 65536
+    ANCBUFSIZE = 128  # enough for one struct timespec cmsg
+
+    def _read():
+        try:
+            data, ancdata, _, addr = sock.recvmsg(BUFSIZE, ANCBUFSIZE)
+        except BlockingIOError:
+            return
+        except OSError as e:
+            logger.warning("recvmsg error: %s", e)
+            return
+        try:
+            kernel_ts = _extract_kernel_ts(ancdata)
+            msg = parse_message(data)
+            if msg:
+                handler(msg, addr, transport, kernel_ts)
+        except Exception:
+            logger.exception("Error processing datagram from %s", addr)
+
+    return _read
+
 
 class EchoServerProtocol(asyncio.DatagramProtocol):
     def __init__(self, config=None, handler=None):
@@ -61,6 +168,152 @@ def dicttos(ID, d):
     return opk
 
 
+DROPOVERDUE = 7 * 24 * 3600  # seconds before an overdue host becomes UNKNOWN
+
+
+def _set_connectivity_alert(host, afam, level_name):
+    """Update (or clear) a connectivity alert_state entry for a host/address-family.
+
+    level_name is "CRITICAL", "WARNING", or "OK".  "OK" removes the entry so
+    that recovered hosts don't clutter the Alerts Dashboard.
+    """
+    from .threshold import AlertState, AlertLevel
+    metric_path = f"connectivity.{afam}"
+    level = getattr(AlertLevel, level_name, AlertLevel.OK)
+    if level == AlertLevel.OK:
+        host.alert_states.pop(metric_path, None)
+        return
+    if metric_path not in host.alert_states:
+        host.alert_states[metric_path] = AlertState(metric_path)
+    state = host.alert_states[metric_path]
+    state.update(level, level_name)
+
+
+def _make_timer_callbacks(uname, host, ctx):
+    """Return (on_overdue, on_unknown) async callbacks for connection timer logic.
+
+    Captured values are bound at call time so callbacks are safe to use in loops.
+    """
+    msg_to_websockets = ctx.get("msg_to_websockets")
+    threshold_checker = ctx.get("threshold_checker")
+    cfg = ctx.get("config", {})
+
+    async def on_unknown(connection):
+        connection.newstate(connection.__class__.UNKNOWN, connection.lastbeat)
+        # Keep connectivity alert active when host transitions to unknown
+        if msg_to_websockets:
+            msg_to_websockets("host", host.stateinfo())
+
+    async def on_overdue(connection):
+        if connection.getstate() != connection.__class__.UP:
+            return
+        now = time.time()
+        connection.newstate(connection.__class__.OVERDUE, now, cfg.get("grace", 2))
+        msg = f"{connection.afam} overdue"
+        eventlog(uname, "CRITICAL", msg)
+        if host.watched:
+            asyncio.create_task(notify_mod.send_notification(
+                uname,
+                notify_mod.Notification(title=f"[CRITICAL] {uname}", body=msg, level="CRITICAL"),
+            ))
+        # Track in alert_states so the Alerts Dashboard shows this
+        _set_connectivity_alert(host, connection.afam, "CRITICAL")
+        if threshold_checker:
+            threshold_checker.check_value(
+                host_name=uname,
+                metric_path="rtt",
+                value=float("inf"),
+                alert_states=host.alert_states,
+            )
+        if msg_to_websockets:
+            msg_to_websockets("host", host.stateinfo())
+        connection.reset_overdue_timer(DROPOVERDUE, on_unknown)
+
+    return on_overdue, on_unknown
+
+
+def _make_plugin_stale_callback(uname, ctx):
+    """Return an async callback that clears stale plugin data and its alerts."""
+    msg_to_websockets = ctx.get("msg_to_websockets")
+
+    async def on_plugin_stale(host, plugin_name):
+        host.plugin_data.pop(plugin_name, None)
+        stale_keys = [k for k in host.alert_states if k.startswith(f"{plugin_name}.")]
+        for k in stale_keys:
+            del host.alert_states[k]
+        eventlog(uname, "INFO", f"plugin data stale: {plugin_name}")
+        if msg_to_websockets:
+            msg_to_websockets("plugin_stale", {"host": uname, "plugin": plugin_name})
+            msg_to_websockets("host", host.stateinfo())
+
+    return on_plugin_stale
+
+
+def restore_connection_timers(hbdclass, ctx):
+    """Restore overdue timers for all loaded connections after a pickle restore.
+
+    For UP connections, the remaining time until overdue is calculated from
+    lastbeat so that clients that vanished during hbd's downtime are detected.
+    For OVERDUE connections, the UNKNOWN drop timer is restored.
+    """
+    now = time.time()
+    cfg = ctx.get("config", {})
+    grace = cfg.get("grace", 2)
+
+    restored = 0
+    for uname, host in list(hbdclass.Host.hosts.items()):
+        interval = host.interval
+        for afam, conn in list(host.connections.items()):
+            state = conn.getstate()
+            if state == hbdclass.Connection.DOWN:
+                _set_connectivity_alert(host, afam, "CRITICAL")
+                continue
+
+            on_overdue, on_unknown = _make_timer_callbacks(uname, host, ctx)
+
+            if state == hbdclass.Connection.UNKNOWN:
+                _set_connectivity_alert(host, afam, "CRITICAL")
+                continue
+
+            if state == hbdclass.Connection.UP and interval > 0:
+                elapsed = now - conn.lastbeat
+                # Give hosts one full (interval + grace) of extra time on startup
+                # so hosts that were silent while hbd was down are not immediately
+                # flagged as overdue before they have a chance to check in.
+                startup_grace = interval + grace
+                remaining = max(startup_grace, 2 * startup_grace - elapsed)
+                conn.reset_overdue_timer(remaining, on_overdue)
+                logger.debug(
+                    "Restored UP timer %s/%s: %.0fs remaining (elapsed %.0fs, startup grace %.0fs)",
+                    uname, afam, remaining, elapsed, startup_grace,
+                )
+                restored += 1
+
+            elif state == hbdclass.Connection.OVERDUE:
+                elapsed_overdue = now - conn.statetime
+                remaining = DROPOVERDUE - elapsed_overdue
+                if remaining <= 1:
+                    # Already past the drop window — mark UNKNOWN immediately
+                    conn.newstate(hbdclass.Connection.UNKNOWN, conn.lastbeat)
+                    logger.info(
+                        "Marking %s/%s UNKNOWN (overdue %.1f days)",
+                        uname, afam, elapsed_overdue / 86400,
+                    )
+                else:
+                    conn.reset_overdue_timer(remaining, on_unknown)
+                    logger.debug(
+                        "Restored OVERDUE timer %s/%s: %.0fs remaining",
+                        uname, afam, remaining,
+                    )
+                # Ensure the connectivity alert is set — it may be missing if
+                # hbd was shut down before the on_overdue callback had a chance
+                # to record it.
+                _set_connectivity_alert(host, afam, "CRITICAL")
+                restored += 1
+
+    logger.info("Restored timers for %d connection(s)", restored)
+
+
 def handle_datagram(msg: dict, addr, transport, ctx: dict):
     """Handle a parsed datagram message.
 
@@ -74,7 +327,7 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
     """
     if not msg:
         return
-    now = __import__("time").time()
+    now = ctx.get("recv_ts") or time.time()
     
     # Log message to journal
     msg_journal = ctx.get("msg_journal")
@@ -89,7 +342,6 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
     
     cfg = ctx.get("config", {})
     hbdcls = ctx.get("hbdclass")
-    log = ctx.get("log")
     msg_to_websockets = ctx.get("msg_to_websockets")
     DEBUG = ctx.get("DEBUG", 0)
     verbose = ctx.get("verbose", False)
@@ -107,16 +359,17 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         # Use new config function to check dyndns
         dyndnshosts = config_mod.get_dyndnshosts(cfg)
         host.dyn = uname in dyndnshosts
-        if verbose:
+        watchhosts = config_mod.get_watchhosts(cfg)
-            print(("XX: New host, num now %s" % (len(hbdcls.Host.hosts))))
+        host.watched = uname in watchhosts
+        # Apply user-access settings from config
+        access = config_mod.get_host_access(cfg, uname)
+        host.apply_access(access["owner"], access["managers"], access["monitors"])
+        logger.info("New host signed on: %s (dyn=%s, access=%s)", uname, host.dyn, access)
         newh = True
     else:
         host = hbdcls.Host.hosts[uname]
         newh = False
     
-    # Get watchhosts once for use throughout message handling
-    watchhosts = config_mod.get_watchhosts(cfg)
-
     cid = msg.get("id", 0)
     try:
         rtt = float(msg.get("rtt"))
@@ -125,8 +378,10 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
 
     if msg.get("ID") == "HTB":
         host.doesack = msg.get("acks", -1)
-        # send ACK back
+        # send ACK back; ask client to resend plugin info when we have none yet
-        rmsg = {"time": __import__("time").time()}
+        rmsg = {"time": time.time()}
+        if not host.plugin_data:
+            rmsg["request_update"] = 1
         opkt = dicttos("ACK", rmsg)
         try:
             transport.sendto(opkt, addr)
@@ -138,10 +393,40 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         # Handle plugin data message
         plugin_name = msg.get("plugin")
         if plugin_name:
-            # Extract all fields except ID and plugin name
+            # Extract plugin fields, dropping protocol metadata fields
-            plugin_data = {k: v for k, v in msg.items() if k not in ["ID", "plugin"]}
+            plugin_data = {k: v for k, v in msg.items()
+                           if k not in ("ID", "plugin", "id", "name")}
             # Store plugin data with timestamp
             host.add_plugin_data(plugin_name, plugin_data, timestamp=now)
+            # Reset stale timer using the observed send interval for this plugin.
+            # We need two samples to know the real interval; on the first sample
+            # we cancel any leftover timer but don't set a new one, to avoid
+            # false-stale firing for slow plugins (e.g. nagios_runner at 300 s).
+            history = host.plugin_data.get(plugin_name, [])
+            if len(history) >= 2:
+                plugin_interval = max(history[-1][0] - history[-2][0], 1)
+                host.reset_plugin_timer(plugin_name, plugin_interval * 3,
+                                        _make_plugin_stale_callback(uname, ctx))
+                # Remove alert states for metrics present in the previous sample
+                # but absent now (e.g. a nagios check removed from configuration).
+                prev_keys = set(history[-2][1].keys())
+                curr_keys = set(plugin_data.keys())
+                for metric_name in prev_keys - curr_keys:
+                    metric_path = f"{plugin_name}.{metric_name}"
+                    if host.alert_states.pop(metric_path, None) is not None:
+                        eventlog(uname, "INFO", f"stale check removed: {metric_path}")
+                if (prev_keys - curr_keys) and msg_to_websockets:
+                    msg_to_websockets("host", host.stateinfo())
+            else:
+                host.cancel_plugin_timer(plugin_name)
+
+            # If os_info reports an owner and none is configured server-side, apply it
+            if plugin_name == "os_info":
+                config_owner =  config_mod.get_host_access(cfg, uname).get("owner")
+                default_owner = config_mod.get_default_owner(cfg)
+                inferred_owner = config_owner or plugin_data.get("owner") or default_owner
+                host.owner = inferred_owner
+                logger.info(f"owner for {uname} is {host.owner}")
             if DEBUG > 1:
                 print(f"Stored plugin data for {uname}: {plugin_name}")
             
@@ -181,8 +466,11 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
 
     if res:
         eventlog(uname, "WARNING", res)
-        if uname in watchhosts:
+        if host.watched:
-            notify_mod.pushmsg_for_host(uname, "%s %s" % (host.name, res))
+            asyncio.create_task(notify_mod.send_notification(
+                uname,
+                notify_mod.Notification(title=f"[WARNING] {uname}", body=res, level="WARNING"),
+            ))
 
     interval = int(msg.get("interval", 0) or 0)
     shutdown = msg.get("shutdown", 0)
@@ -191,25 +479,51 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
     boot = msg.get("boot", 0)
 
     if boot:
+        # hbc was stared with a -b flag
         eventlog(uname, "INFO", "booted")
-        if uname in watchhosts:
+        if host.watched:
-            m = "%s booted" % (host.name)
+            asyncio.create_task(notify_mod.send_notification(
-            notify_mod.pushmsg_for_host(uname, m)
+                uname,
+                notify_mod.Notification(title=f"[INFO] {uname}", body=f"{host.name} booted", level="INFO"),
+            ))
     if message:
-        eventlog(uname, "INFO", "msg: %s" % message, service=service)
+        eventlog(uname, "INFO", message, service=service)
-        if uname in watchhosts:
-            notify_mod.pushmsg_for_host(uname, message)
 
     if conn.getstate() != hbdcls.Connection.UP:
+        # Transition to UP and log/notify if appropriate
         lasts = conn.state
         d = conn.newstate(hbdcls.Connection.UP, now)
-        if d == 0 or lasts == "unknown":
+        # On reboot, pre-boot plugin data and derived alerts are stale.
-            m = "%s is up" % (conn.afam)
+        # Cancel all plugin timers and wipe plugin state so timers restart
-        else:
+        # cleanly from the first two post-boot samples.
-            m = "%s back after being %s for %s" % (conn.afam, lasts, dur(d))
+        for pname in list(host.plugin_timers):
-        eventlog(uname, "RECOVER", m)
+            host.cancel_plugin_timer(pname)
-        if uname in watchhosts:
+        host.plugin_data.clear()
-            notify_mod.pushmsg_for_host(uname, "%s %s is back" % (uname, conn.afam))
+        stale_plugin_keys = [
+            k for k in host.alert_states
+            if k not in ("rtt",) and not k.startswith("connectivity.")
+        ]
+        for k in stale_plugin_keys:
+            del host.alert_states[k]
+        # Clear connectivity alert now that the host is back up
+        _set_connectivity_alert(host, conn.afam, "OK")
+        # Don't log/notify RECOVER for a brand-new host seen for the first time —
+        # it was never down, it just hasn't been seen before.
+        if not newh:
+            if d == 0 or lasts == "unknown":
+                m = "%s is up" % (conn.afam)
+            elif d < 4:
+                # Transient blip (likely client restart) — skip log and notification
+                m = None
+            else:
+                m = "%s back after being %s for %s" % (conn.afam, lasts, dur(d))
+            if m:
+                eventlog(uname, "RECOVER", m)
+                if host.watched:
+                    asyncio.create_task(notify_mod.send_notification(
+                        uname,
+                        notify_mod.Notification(title=f"[RECOVER] {uname}", body=m, level="RECOVER"),
+                    ))
 
     if boot or newh:
         host.upcount = host.doesack
@@ -217,63 +531,25 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         host.upcount += 1
 
     if shutdown:
-        eventlog(uname, "INFO", "%s shutdown" % conn.afam)
+        m = "%s shutdown" % conn.afam
-        if uname in watchhosts:
+        eventlog(uname, "INFO", m)
-            notify_mod.pushmsg_for_host(uname, "%s %s shutdown" % (uname, conn.afam))
+        if host.watched:
+            asyncio.create_task(notify_mod.send_notification(
+                uname,
+                notify_mod.Notification(title=f"[INFO] {uname}", body=m, level="INFO"),
+            ))
         conn.newstate(hbdcls.Connection.DOWN, now)
+        _set_connectivity_alert(host, conn.afam, "CRITICAL")
 
     if interval > 0:
         host.interval = interval
-    
+
     # Timer-based reachability monitoring
     # Reset overdue timer on every heartbeat
     if interval > 0 and conn.getstate() != hbdcls.Connection.DOWN:
         grace = cfg.get("grace", 2)
-        timeout_seconds = (interval + grace) if interval > 0 else 30
+        timeout_seconds = interval + grace
-        
+        on_overdue, _ = _make_timer_callbacks(uname, host, ctx)
-        # Create callback for timer expiration
-        async def on_overdue(connection):
-            """Called when connection timer expires (no heartbeat received)."""
-            import time
-            now = time.time()
-            
-            # Only mark as overdue if still in UP state (not already marked)
-            if connection.getstate() == hbdcls.Connection.UP:
-                connection.newstate(hbdcls.Connection.OVERDUE, now, cfg.get("grace", 2))
-                
-                msg = f"{connection.afam} overdue"
-                eventlog(uname, "CRITICAL" if uname in watchhosts else "WARNING", msg)
-                
-                if uname in watchhosts:
-                    notify_mod.pushmsg_for_host(uname, f"{uname} {msg}")
-                
-                # Check RTT thresholds with infinite RTT for overdue hosts
-                threshold_checker = ctx.get("threshold_checker")
-                if threshold_checker:
-                    metric_path = "rtt"
-                    threshold_checker.check_value(
-                        host_name=uname,
-                        metric_path=metric_path,
-                        value=float('inf'),
-                        alert_states=host.alert_states
-                    )
-                
-                # Notify websockets
-                if msg_to_websockets:
-                    msg_to_websockets("host", host.stateinfo())
-                
-                # Set a longer timer for marking as UNKNOWN (7 days)
-                DROPOVERDUE = 7 * 24 * 3600
-                
-                async def on_unknown(connection):
-                    """Mark connection as unknown after extended absence."""
-                    connection.newstate(hbdcls.Connection.UNKNOWN, connection.lastbeat)
-                    if msg_to_websockets:
-                        msg_to_websockets("host", host.stateinfo())
-                
-                connection.reset_overdue_timer(DROPOVERDUE, on_unknown)
-        
-        # Reset the timer
         conn.reset_overdue_timer(timeout_seconds, on_overdue)
     
     # Check RTT thresholds using the threshold checker
@@ -295,12 +571,10 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         op, rmsg = host.cmds[0]
         if op == "CMD":
             del host.cmds[0]
-            if log:
+            eventlog(uname, "INFO", "command sent")
-                log(uname, "command sent")
         elif op == "UPD":
             del host.cmds[0]
-            if log:
+            eventlog(uname, "INFO", "update initiated")
-                log(uname, "update initiated")
         opkt = dicttos(op, rmsg)
         try:
             transport.sendto(opkt, addr)

hbd/server/users.py

@@ -0,0 +1,271 @@
+"""User management: loading, authentication, and session tracking.
+
+Users are defined in the config file under the ``users`` key:
+
+    users:
+      alice:
+        full_name: Alice Smith
+        avatar: /path/to/avatar.png   # file path, URL, or base64 data URI
+        password: pbkdf2:sha256:...   # generated with: hbd passwd
+        admin: true                   # optional server-level admin
+        notification_channels: [pushover_standard]
+
+Roles are assigned per-host:
+
+    hosts:
+      webserver01:
+        owner: alice
+        managers: [bob]
+        monitors: [carol]
+
+If no users are defined the server runs in unauthenticated mode (backwards
+compatible).  When users are defined every API call must carry a valid session
+token in an ``Authorization: Bearer <token>`` or ``X-Auth-Token`` header,
+obtained via ``POST /api/0/auth/login``.
+"""
+
+import hashlib
+import hmac
+import logging
+import secrets
+import time
+
+logger = logging.getLogger(__name__)
+
+# Session lifetime in seconds (24 hours).
+SESSION_TTL = 86400
+
+# Global session store: token -> {"username": str, "expires": float, "created": float}
+_sessions: dict = {}
+
+
+# ---------------------------------------------------------------------------
+# User class
+# ---------------------------------------------------------------------------
+
+class User:
+    def __init__(
+        self,
+        username: str,
+        full_name: str = "",
+        avatar: str = "",
+        password_hash: str = "",
+        admin: bool = False,
+        notification_channels: list | None = None,
+    ):
+        self.username = username
+        self.full_name = full_name
+        self.avatar = avatar
+        self.password_hash = password_hash
+        self.admin = admin
+        self.notification_channels: list = notification_channels or []
+
+    def check_password(self, password: str) -> bool:
+        if not self.password_hash:
+            return False
+        return _verify_password(password, self.password_hash)
+
+    def avatar_is_local(self) -> bool:
+        """Return True when the avatar is a local filesystem path (starts with '/')."""
+        return bool(self.avatar and self.avatar.startswith("/"))
+
+    def avatar_url(self) -> str:
+        """Return the URL to use as an <img src>.
+
+        Local file paths are served via the /api/0/users/{username}/avatar
+        endpoint.  External URLs and data URIs are returned as-is.
+        """
+        if self.avatar_is_local():
+            return f"/api/0/users/{self.username}/avatar"
+        return self.avatar
+
+    def to_dict(self) -> dict:
+        return {
+            "username": self.username,
+            "full_name": self.full_name,
+            "avatar": self.avatar,
+            "avatar_url": self.avatar_url(),
+            "admin": self.admin,
+            "notification_channels": self.notification_channels,
+        }
+
+
+# ---------------------------------------------------------------------------
+# Password hashing  (PBKDF2-HMAC-SHA256, stdlib only)
+# ---------------------------------------------------------------------------
+
+def hash_password(password: str) -> str:
+    """Return a storable hash for *password*.
+
+    Format: ``pbkdf2:sha256:<iterations>:<salt>:<hex-digest>``
+
+    Use this to generate the ``password`` value in the config file::
+
+        python -c "from hbd.server.users import hash_password; print(hash_password('secret'))"
+
+    Or via the CLI::
+
+        hbd passwd
+    """
+    salt = secrets.token_hex(16)
+    iterations = 260_000
+    dk = hashlib.pbkdf2_hmac(
+        "sha256", password.encode("utf-8"), salt.encode("utf-8"), iterations
+    )
+    return f"pbkdf2:sha256:{iterations}:{salt}:{dk.hex()}"
+
+
+def _verify_password(password: str, stored_hash: str) -> bool:
+    """Return True if *password* matches *stored_hash*."""
+    try:
+        parts = stored_hash.split(":")
+        if len(parts) != 5 or parts[0] != "pbkdf2" or parts[1] != "sha256":
+            return False
+        _, _, iterations_str, salt, expected_hex = parts
+        iterations = int(iterations_str)
+        dk = hashlib.pbkdf2_hmac(
+            "sha256", password.encode("utf-8"), salt.encode("utf-8"), iterations
+        )
+        return hmac.compare_digest(dk.hex(), expected_hex)
+    except Exception:
+        return False
+
+
+# ---------------------------------------------------------------------------
+# Global user registry
+# ---------------------------------------------------------------------------
+
+# username -> User
+users: dict = {}
+
+
+def load_users(config: dict) -> dict:
+    """Populate the global user registry from *config*.
+
+    Called once at startup and again on SIGHUP config reload.
+    Returns the new ``users`` dict.
+    """
+    global users
+    old_users = dict(users)  # snapshot before rebuild
+    users_cfg = config.get("users", {})
+    if not isinstance(users_cfg, dict):
+        users = {}
+        # Preserve OAuth-provisioned users (password_hash == "") that aren't in config.
+        for username, existing_user in old_users.items():
+            if not existing_user.password_hash and username not in users:
+                users[username] = existing_user
+        return users
+
+    result: dict = {}
+    for username, attrs in users_cfg.items():
+        if not isinstance(attrs, dict):
+            logger.warning("Skipping user %r: expected a mapping", username)
+            continue
+        result[username] = User(
+            username=username,
+            full_name=attrs.get("full_name", ""),
+            avatar=attrs.get("avatar", ""),
+            password_hash=attrs.get("password", ""),
+            admin=bool(attrs.get("admin", False)),
+            notification_channels=attrs.get("notification_channels", []),
+        )
+
+    users = result
+    # Preserve OAuth-provisioned users (password_hash == "") that aren't in config.
+    for username, existing_user in old_users.items():
+        if not existing_user.password_hash and username not in users:
+            users[username] = existing_user
+    logger.info("Loaded %d user(s) from config", len(users))
+    return users
+
+
+def users_enabled() -> bool:
+    """Return True if at least one user is configured (auth-required mode)."""
+    return bool(users)
+
+
+def get_user(username: str) -> "User | None":
+    return users.get(username)
+
+
+def authenticate(username: str, password: str) -> "User | None":
+    """Return the User if credentials are valid, else None."""
+    user = users.get(username)
+    if user and user.check_password(password):
+        return user
+    return None
+
+
+def provision_oauth_user(username: str, full_name: str, avatar: str) -> "User":
+    """Create or update a user sourced from an OAuth2 provider.
+
+    New users are inserted with no password_hash — they can only authenticate
+    via OAuth.  Existing users (e.g. defined in config with a password) have
+    their display name and avatar refreshed; all other attributes are preserved.
+    """
+    user = users.get(username)
+    if user is None:
+        user = User(username=username, full_name=full_name, avatar=avatar)
+        users[username] = user
+        logger.info("Provisioned OAuth user %r", username)
+    else:
+        if full_name:
+            user.full_name = full_name
+        if avatar:
+            user.avatar = avatar
+    return user
+
+
+# ---------------------------------------------------------------------------
+# Session management
+# ---------------------------------------------------------------------------
+
+def create_session(username: str) -> str:
+    """Create a new session for *username* and return the opaque token."""
+    _purge_expired_sessions()
+    token = secrets.token_hex(32)
+    _sessions[token] = {
+        "username": username,
+        "expires": time.time() + SESSION_TTL,
+        "created": time.time(),
+    }
+    return token
+
+
+def get_session_user(token: str) -> "User | None":
+    """Return the User for a valid *token*, or None if missing/expired."""
+    if not token:
+        return None
+    session = _sessions.get(token)
+    if not session:
+        return None
+    if session["expires"] < time.time():
+        del _sessions[token]
+        return None
+    return get_user(session["username"])
+
+
+def delete_session(token: str) -> None:
+    """Invalidate *token* (logout)."""
+    _sessions.pop(token, None)
+
+
+def _purge_expired_sessions() -> None:
+    now = time.time()
+    expired = [t for t, s in list(_sessions.items()) if s["expires"] < now]
+    for t in expired:
+        del _sessions[t]
+
+
+def save_sessions() -> dict:
+    """Return a snapshot of non-expired sessions suitable for pickling."""
+    _purge_expired_sessions()
+    return dict(_sessions)
+
+
+def load_sessions(snapshot: dict) -> None:
+    """Restore sessions from a pickled snapshot, dropping any that have expired."""
+    global _sessions
+    now = time.time()
+    _sessions = {t: s for t, s in snapshot.items() if s.get("expires", 0) > now}
+    logger.debug("Restored %d session(s) from pickle", len(_sessions))

hbd/server/ws.py

@@ -1,7 +1,8 @@
-"""WebSocket server and broadcast helpers for hbd.
+"""WebSocket handler and broadcast helpers for hbd.
 
-Provides an asyncio-based WebSocket server and a thread-safe broadcast
+WebSocket connections are served through the regular HTTP port via the
-function that other threads or synchronous code can call.
+/ws route registered in http.py (aiohttp WebSocketResponse upgrade).
+The separate standalone WebSocket server on ws_port is no longer used.
 """
 
 import asyncio
@@ -10,144 +11,148 @@ import logging
 from typing import Callable, Iterable, Optional
 from . import data
 
-import websockets
-
 logger = logging.getLogger(__name__)
-logger.setLevel(logging.INFO)
+
-_connections = set()
+# Map of WebSocket → User object (or None when auth is disabled)
+_connections: dict = {}
 _loop: Optional[asyncio.AbstractEventLoop] = None
 _get_hosts: Optional[Callable[[], Iterable]] = None
-#_get_msgs: Optional[Callable[[], Iterable]] = None
+_verbose: bool = False
-_verbose = False
 
 
-async def _handler(websocket, path=None):
+def setup(
-    _connections.add(websocket)
+    loop: asyncio.AbstractEventLoop,
-    remote_address = websocket.remote_address
+    get_hosts: Optional[Callable[[], Iterable]] = None,
-    if path is None:
+    verbose: bool = False,
-        path = getattr(websocket, "path", None)
-    logger.info("WebSocket connection from %s: %s", remote_address, path)
-    try:
-        # send initial hosts
-        if _get_hosts:
-            try:
-                hosts = list(_get_hosts())
-                logger.debug("Sending %d hosts to new WebSocket client", len(hosts))
-                for h in hosts:
-                    jmsg = json.dumps({"type": "host", "data": h})
-                    await websocket.send(jmsg)
-            except Exception as e:
-                logger.error("Error sending initial hosts: %s", e, exc_info=True)
-        # send recent messages
-        if data.msgs:
-            try:
-#                msgs = list(_get_msgs())[-100:]
-                logger.debug("Sending %d recent messages to new WebSocket client", len(data.msgs))
-                for m in data.msgs:
-                    jmsg = json.dumps({"type": "message", "data": m})
-                    await websocket.send(jmsg)
-            except Exception as e:
-                logger.error("Error sending initial messages: %s", e, exc_info=True)
-
-        # keep connection open until client disconnects
-        async for _ in websocket:
-            # we don't expect meaningful incoming messages besides the initial
-            # client 'hello' that some clients send; ignore for now
-            if _verbose:
-                logger.debug("received ws data: %s", _)
-
-    except (
-        websockets.exceptions.ConnectionClosedOK,
-        websockets.exceptions.ConnectionClosedError,
-    ) as e:
-        logger.info("WebSocket closed from %s: %r", remote_address, e)
-    except Exception as e:
-        logger.exception("WebSocket handler exception from %s: %s", remote_address, e)
-    finally:
-        logger.debug("Removing WebSocket connection from %s", remote_address)
-        try:
-            _connections.remove(websocket)
-        except KeyError:
-            pass
-        await websocket.wait_closed()
-
-
-async def start(
-    host: str,
-    ws_port: int,
-    wss_port: Optional[int] = None,
-    ssl_context=None,
-    get_hosts: Optional[Callable] = None,
-#    get_msgs: Optional[Callable] = None,
-    config: dict = {},
 ):
-    """Start WebSocket servers and block until cancelled.
+    """Register the running loop and initial-state callback.
 
-    This is intended to be awaited inside the main asyncio event loop.
+    Call this once from _run_async before starting the HTTP server.
-    If `wss_port` and `ssl_context` are provided, a WSS server will also be
-    started.
     """
     global _loop, _get_hosts, _verbose
-    _loop = asyncio.get_running_loop()
+    _loop = loop
     _get_hosts = get_hosts
-    _verbose = config.get("verbose", False),
+    _verbose = verbose
-    _debug = config.get("debug", 0),
-
-    servers = []
-    # plain WebSocket
-    websockets_logger = logging.getLogger("websockets.server")
-    #if _debug > 2:
-    #    websockets_logger.setLevel(logging.DEBUG)
-    #else:   
-    #    websockets_logger.setLevel(logging.INFO)
-    # regular WebSocket
-    ws_server = websockets.serve(_handler, host, ws_port)  # , subprotocols=["hbd"])
-    servers.append(ws_server)
-    # secure WebSocket (optional)
-    if wss_port and ssl_context:
-        wss_server = websockets.serve(
-            _handler, host, wss_port, ssl=ssl_context
-        )  # , subprotocols=["hbd"])
-        servers.append(wss_server)
-
-    # await starting of all servers
-    for srv in servers:
-        await srv
-
-    logger.info(
-        "WebSocket server(s) started on port %s (wss %s)", ws_port, wss_port
-    )
-
-    # block forever (until loop is stopped or cancelled)
-    await asyncio.Future()
 
 
-def broadcast(typ: str, data) -> bool:
+def _user_can_see_host(user, host_name: str) -> bool:
-    """Thread-safe broadcast helper.
+    """Return True if *user* may see updates for *host_name* (manager or higher)."""
+    from . import hbdclass, users as users_mod
+    if user is None or not users_mod.users_enabled():
+        return True
+    if user.admin:
+        return True
+    host = hbdclass.Host.hosts.get(host_name)
+    if host is None:
+        return False
+    return host.is_manager(user.username)
 
-    Schedules coroutine(s) on the running loop to send message to all
+
-    connected websockets. Returns False if server was not running.
+def _get_token(request) -> str:
+    """Extract session token from request (mirrors logic in http.py)."""
+    auth = request.headers.get("Authorization", "")
+    if auth.startswith("Bearer "):
+        return auth[7:].strip()
+    token = request.headers.get("X-Auth-Token", "")
+    if token:
+        return token
+    return request.cookies.get("hbd_session", "")
+
+
+async def handler(request):
+    """aiohttp WebSocket upgrade handler — register as GET /ws."""
+    from aiohttp import web
+    from . import users as users_mod
+
+    ws = web.WebSocketResponse()
+    await ws.prepare(request)
+
+    token = _get_token(request)
+    user = users_mod.get_session_user(token) if token else None
+
+    _connections[ws] = user
+    remote = request.remote
+    logger.info("WebSocket connected from %s", remote)
+
+    try:
+        # Send current host state, filtered to hosts this user may see
+        if _get_hosts:
+            try:
+                for h in list(_get_hosts()):
+                    host_name = h.get("raw_name") or h.get("name", "")
+                    if _user_can_see_host(user, host_name):
+                        await ws.send_str(json.dumps({"type": "host", "data": h}))
+            except Exception as e:
+                logger.error("Error sending initial hosts: %s", e)
+
+        # Send recent messages newest-first so the client can append them in
+        # display order without reordering on arrival (tagged history=True so
+        # the client knows to append rather than prepend).
+        if data.msgs:
+            try:
+                for m in reversed(data.msgs):
+                    host_name = m.get("host") if isinstance(m, dict) else None
+                    if not host_name or _user_can_see_host(user, host_name):
+                        await ws.send_str(json.dumps({"type": "message", "data": m, "history": True}))
+            except Exception as e:
+                logger.error("Error sending initial messages: %s", e)
+
+        # Keep connection open, ignore incoming frames
+        async for msg in ws:
+            from aiohttp import WSMsgType
+            if msg.type == WSMsgType.TEXT:
+                if _verbose:
+                    logger.debug("ws recv from %s: %s", remote, msg.data)
+            elif msg.type in (WSMsgType.ERROR, WSMsgType.CLOSE):
+                break
+
+    except Exception as e:
+        logger.exception("WebSocket handler error from %s: %s", remote, e)
+    finally:
+        _connections.pop(ws, None)
+        logger.info("WebSocket disconnected from %s", remote)
+
+    return ws
+
+
+def broadcast(typ: str, payload) -> bool:
+    """Thread-safe broadcast to all connected WebSocket clients.
+
+    For host and plugin updates, only sends to clients whose user has
+    manager-or-higher access to that host.  Other message types are
+    broadcast to all clients.
+
+    Can be called from any thread; schedules sends on the event loop.
+    Returns False if the loop is not running yet.
     """
     if not _loop:
         return False
-    jmsg = json.dumps({"type": typ, "data": data})
+
-    to_close = []
+    # Determine the host name for access-filtered message types
-    for ws in list(_connections):
+    host_name: Optional[str] = None
-        if ws.state != websockets.protocol.State.OPEN:
+    if typ in ("host", "plugin"):
-            to_close.append(ws)
+        host_name = payload.get("raw_name") or payload.get("host") or payload.get("name")
-            continue
+    elif typ == "message" and isinstance(payload, dict):
-        try:
+        host_name = payload.get("host")
-            asyncio.run_coroutine_threadsafe(ws.send(jmsg), _loop)
+
-        except Exception:
+    jmsg = json.dumps({"type": typ, "data": payload})
-            to_close.append(ws)
+
-            logger.debug("ws.send exception: closed")
+    async def _send_all():
-    for ws in to_close:
+        dead = set()
-        try:
+        for ws, user in list(_connections.items()):
-            asyncio.run_coroutine_threadsafe(ws.wait_closed(), _loop)
+            try:
-        except Exception:
+                if ws.closed:
-            pass
+                    dead.add(ws)
-        if ws in _connections:
+                    continue
-            _connections.remove(ws)
+                if host_name is not None and not _user_can_see_host(user, host_name):
+                    continue
+                await ws.send_str(jmsg)
+            except Exception:
+                dead.add(ws)
+        for ws in dead:
+            _connections.pop(ws, None)
+
+    asyncio.run_coroutine_threadsafe(_send_all(), _loop)
     return True
 
 

pyproject.toml

@@ -4,20 +4,32 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "hbd"
-version = "5.0.7"
+version = "5.3.10"
 description = "Heartbeat monitoring system — client (hbc) and server (hbd)"
 readme = "README.md"
 requires-python = ">=3.11"
-license = "MIT" 
-keywords = ["heartbeat", "monitoring", "dns", "websocket", "system-monitoring"]
-authors = [
-  { name = "heartbeat contributors" }
-]
-
-# Core dependencies (required for both client and server)
 dependencies = [
   "PyYAML>=6.0",
 ]
+license = "MIT"
+license-files = ["LICENSE.md"]
+keywords = ["heartbeat", "monitoring", "dns", "websocket", "system-monitoring"]
+authors = [
+  { name = "Andreas Wrede" }
+]
+classifiers = [
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+  "Operating System :: POSIX :: Linux",
+  "Operating System :: POSIX :: BSD",
+  "Topic :: System :: Monitoring",
+  "Topic :: System :: Networking :: Monitoring",
+]
+
+[project.urls]
+Repository = "https://git.wrede.ca/andreas/heartbeat"
 
 [project.optional-dependencies]
 # Client-only dependencies (hbc - system monitoring client)
@@ -31,8 +43,13 @@ server = [
   "mattermostdriver>=7.3.0",
   "aiohttp>=3.11",
   "Jinja2>=3.1.6",
+  "matrix-nio>=0.24",
+  "ruamel.yaml>=0.18",
 ]
 
+# Minimal client — hbc_mini only, no external dependencies
+mini = []
+
 # Install both client and server
 all = [
   "hbd[client,server]",
@@ -53,6 +70,9 @@ dev = [
 hbd = "hbd.server.cli:main"
 hbc = "hbd.client.main:main"
 
+[tool.setuptools]
+script-files = ["scripts/hb_install.sh", "scripts/hbc_mini.py"]
+
 [tool.setuptools.packages.find]
 where = ["."]
 include = ["hbd*"]

rndc-key

@@ -1,4 +0,0 @@
-key "rndc-key" {
-      algorithm hmac-md5;
-      secret "qlGa+AYKtyOgWNuozqECMw==";
-};

scripts/async_sms_send.py

@@ -0,0 +1,40 @@
+async def send_sms(hass, user, password, sender_did, call):
+    """Send SMS message using multipart form-data like MMS."""
+    _LOGGER = logging.getLogger(__name__)
+    recipient = call.data.get("recipient")
+    message = call.data.get("message")
+
+    if not recipient or not message:
+        _LOGGER.error("Recipient or message missing.")
+        return
+
+    # Build form data dictionary
+    form_data = {
+        'api_username': str(user),
+        'api_password': str(password),
+        'did': str(sender_did),
+        'dst': str(recipient),
+        'message': str(message),
+        'method': 'sendSMS'
+    }
+
+    async with aiohttp.ClientSession() as session:
+        with aiohttp.MultipartWriter("form-data") as mp:
+            for key, value in form_data.items():
+                part = mp.append(value)
+                part.set_content_disposition('form-data', name=key)
+
+            _LOGGER.error("voipms_sms: sending SMS: %s", mp)
+            async with session.post(REST_ENDPOINT, data=mp) as response:
+                response_text = await response.text()
+                if response.status == 200:
+                    response_json = json.loads(response_text)
+                    if response_json['status'] == "success": 
+                        _LOGGER.info("voipms_sms: SMS sent successfully: %s", response_text)
+                    else:
+                        _LOGGER.error("voipms_sms: SMS not sent: %s", response_text)
+                else:
+                    _LOGGER.error("voipms_sms: Failed to send SMS. Status: %s, Response: %s", response.status, response_text)
+
+
+

scripts/bumpminor.sh

@@ -4,12 +4,29 @@ set -e
 uv version --bump patch 
 VER=$(uv  version  --short)
 sed -i".bak"  "s/__version__ = \"[0-9.]*\"\(.*\)$/__version__ = \"$VER\"\1/" hbd/__init__.py
+sed -i".bak"  "s/__version__ = \"[0-9.]*\"\(.*\)$/__version__ = \"$VER\"\1/" scripts/hbc_mini.py
+sed -i".bak"  "s/\*\*Package:\*\* \`hbd\` v[0-9.]*/\*\*Package:\*\* \`hbd\` v$VER/" README.md
+
+# Update CHANGELOG.md with commits since last tag
+LASTTAG=$(git describe --tags --abbrev=0 2>/dev/null || true)
+ADDED=$(git log "${LASTTAG:+$LASTTAG..}HEAD" --pretty="%s" | grep "^feat:" | sed 's/^feat: /- /')
+FIXED=$(git log "${LASTTAG:+$LASTTAG..}HEAD" --pretty="%s" | grep "^fix:" | sed 's/^fix: /- /')
+{
+    printf "## [%s]\n" "$VER"
+    [ -n "$ADDED" ] && printf "\n### Added\n%s\n" "$ADDED"
+    [ -n "$FIXED" ] && printf "\n### Fixed\n%s\n" "$FIXED"
+    printf "\n---\n\n"
+} > /tmp/changelog_entry.txt
+sed -i".bak" "4r /tmp/changelog_entry.txt" CHANGELOG.md
+rm /tmp/changelog_entry.txt CHANGELOG.md.bak
 
 # commit pyproject.toml
-git commit -m "version $VER" pyproject.toml hbd/__init__.py
+git commit -m "version $VER" pyproject.toml hbd/__init__.py scripts/hbc_mini.py README.md CHANGELOG.md
 git push 
 # tag version
 git tag -a v$VER -m "Version $VER"
 git push --tags
 
 rm hbd/__init__.py.bak
+rm scripts/hbc_mini.py.bak
+rm README.md.bak

scripts/c/.gitignore

@@ -0,0 +1,2 @@
+hbc_mini
+hbc_mini_dbg

scripts/c/Makefile

@@ -0,0 +1,21 @@
+CC      ?= cc
+CFLAGS  = -O2 -Wall -Wextra -std=c11
+LDFLAGS = -lz -lpthread -lm
+TARGET  = hbc_mini
+SRC     = hbc_mini.c
+
+# FreeBSD/NetBSD keep zlib in base; no extra flags needed.
+# On some NetBSD installs pthreads may need -lpthread from pkgsrc.
+
+.PHONY: all clean debug
+
+all: $(TARGET)
+
+$(TARGET): $(SRC)
+	$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
+
+debug: $(SRC)
+	$(CC) -g -fsanitize=address,undefined -o $(TARGET)_dbg $< $(LDFLAGS)
+
+clean:
+	rm -f $(TARGET) $(TARGET)_dbg

scripts/hb_install.sh

@@ -0,0 +1,115 @@
+#!/bin/sh
+
+# Helper script to install the heartbeat tools. By default, it will only
+# install the heartbeat client, hbc. The server is installed when the arg 'server' is passed 
+# to the script. The script will install the heartbeat tools in a python 
+# virtual environment in ~/venvs/hbd. The hbd and hbc commands will be
+# installed from the wheel and symlinked to ~/bin/hbd and ~/bin/hbc,
+# respectively. If the virtual environment already exists, it will be
+# reused. The script will also remove any existing symlinks for hbd and hbc
+# in ~/bin before creating new ones.
+
+set -e
+what=$1
+on_ha=0
+where=""
+venv=""
+[ "$2" = "HA" ] && on_ha=1
+[ -z "$what" ] && what="client"
+
+if [ -d /homeassistant ]; then  # if running from HA command line
+    echo "HA, running \"docker exec homeassistant /config/bin/hb_install.sh $@\""
+    docker exec homeassistant /config/bin/hb_install.sh $@ HA
+    rc=$?
+    if [ $rc -ne 0 ]; then
+        echo "Failed to install heartbeat in HA, please check the logs for more details"
+        exit 1
+    fi
+    exit 0
+fi
+
+if [ $on_ha -eq 1 ] || [ -r /.dockerenv ] && [ -d /config/bin ]; then
+    # Installing under docker on Home Assistant OS, using /config/bin for executables and /config/venvs for virtual environments 
+    echo "Home Assistant OS detected, installing under docker"
+    where="/config/bin"
+    venv="/config/venvs"
+else
+    if [ ! -d $HOME/.local/bin ] && [ ! -d $HOME/bin ]; then
+        echo "No suitable bin directory found in PATH, please add either $HOME/.local/bin or $HOME/bin to your PATH"
+        exit 1
+    fi
+    for where in $HOME/bin $HOME/.local/bin notset ; do
+        if echo ":$PATH:" | grep -q ":$where:" ; then
+            break
+        fi
+    done
+    if [ "$where" = "notset" ]; then
+        echo "No suitable bin directory found in PATH, please add either $HOME/.local/bin or $HOME/bin to your PATH"
+        exit 1
+    fi
+    if [ "$what" = "mini" ]; then
+        venv=""
+    else
+        venv="$HOME/venvs"
+    fi
+fi
+echo "Installing $what to $where"
+if [ ! -z "$venv" ]; then
+    echo "Using virtual environment at $venv/hbd"
+fi
+
+if [ "$venv" != "" ] && [ ! -d  $venv/hbd ]; then
+    arg=""
+    have_pip=$(python3 -c "import pip" 2>/dev/null &> /dev/null && echo "Installed" || echo "Not Installed")
+    if [ "$have_pip" = "Not Installed" ]; then
+        # some systems do not have pip installed by default, so we need to fetch get-pip.py and install pip
+        echo "pip is not installed, fetching get-pip.py and installing pip"
+        arg="--without-pip"
+    fi
+    mkdir -p $venv
+    have_venv=$(python3 -c "import venv" 2>/dev/null &> /dev/null && echo "Installed" || echo "Not Installed")
+    if [ "$have_venv" = "Not Installed" ]; then
+        if [ "$have_pip" = "Not Installed" ]; then
+            echo "python has no venv, and no pip to install virtualenv, cannot continue"
+            exit 1
+        fi
+        echo "python venv module not found, installing virtualenv"
+        python3 -m pip install --user virtualenv
+        python3 -m virtualenv $venv/hbd --system-site-packages $arg
+    else
+        python3 -m venv $venv/hbd --system-site-packages $arg
+    fi
+    . $venv/hbd/bin/activate
+    if [ -n "$arg" ]; then  
+        curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py && python3 get-pip.py
+    fi
+    deactivate
+fi
+
+if [ ! -z "$venv" ]; then
+    . $venv/hbd/bin/activate
+fi
+if [ "$what" = "mini" ]; then
+    curl -s -o $where/hbc_mini https://git.wrede.ca/andreas/heartbeat/raw/branch/master/scripts/hbc_mini.py
+    chmod +x $where/hbc_mini
+else
+    python3 -mpip install --upgrade --index-url https://git.wrede.ca/api/packages/andreas/pypi/simple/ --extra-index-url https://pypi.org/simple hbd[$what]
+fi
+
+if [ ! -z "$venv" ]; then
+    echo "linking executables to $where"
+    if [ "$what" = "server" ]; then
+        rm -f $where/hbd
+        ln -sf $(which hbd) $where/hbd
+    elif [ "$what" = "client" ]; then
+        rm -f $where/hbc
+        ln -sf $(which hbc) $where/hbc
+    fi
+    rm -f $where/hb_install.sh
+    ln -sf $(which hb_install.sh) $where/hb_install.sh
+fi
+echo "Installation complete. To upgrade, run the following:"
+echo "    $where/hb_install.sh $what"
+echo "To install on another machine, run the following obtain the install script and run it:"
+echo "from https://git.wrede.ca/andreas/heartbeat/raw/branch/master/scripts/hb_install.sh"
+echo "and then run sh hb_install.sh [mini|client]"

scripts/hbc_windows.spec

@@ -0,0 +1,49 @@
+# PyInstaller spec for hbc_windows.exe
+# Build with: pyinstaller hbc_windows.spec
+#
+# Requirements (on Windows):
+#   pip install pyinstaller
+
+block_cipher = None
+
+a = Analysis(
+    ['hbc_windows.py'],
+    pathex=[],
+    binaries=[],
+    datas=[],
+    hiddenimports=[],
+    hookspath=[],
+    hooksconfig={},
+    runtime_hooks=[],
+    excludes=['tkinter', 'unittest', 'email', 'html', 'http', 'urllib', 'xml'],
+    win_no_prefer_redirects=False,
+    win_private_assemblies=False,
+    cipher=block_cipher,
+    noarchive=False,
+)
+
+pyz = PYZ(a.pure, a.zlib_archive, cipher=block_cipher)
+
+exe = EXE(
+    pyz,
+    a.scripts,
+    a.binaries,
+    a.zipfiles,
+    a.datas,
+    [],
+    name='hbc_windows',
+    debug=False,
+    bootloader_ignore_signals=False,
+    strip=False,
+    upx=False,
+    upx_exclude=[],
+    runtime_tmpdir=None,
+    console=True,
+    disable_windowed_traceback=False,
+    argv_emulation=False,
+    target_arch=None,
+    codesign_identity=None,
+    entitlements_file=None,
+    icon=None,
+    version=None,
+)

scripts/install.sh

@@ -1,15 +0,0 @@
-#!/bin/sh
-
-# install hbd/hbc from wheel and create symlinks for hbd and hbc in ~/bin
-
-set -e
-if [ ! -d  ~/venvs/hbd ]; then
-    mkdir -p ~/venvs
-    python3 -m venv ~/venvs/hbd --system-site-packages
-fi
-. ~/venvs/hbd/bin/activate
-pip install 'git+ssh://git@git.wrede.ca/andreas/heartbeat.git'
-rm -f ~/bin/hbd
-rm -f ~/bin/hbc
-ln -sf $(which hbd) ~/bin/hbd
-ln -sf $(which hbc) ~/bin/hbc

scripts/install_hbc_windows.ps1

@@ -0,0 +1,126 @@
+#Requires -RunAsAdministrator
+<#
+.SYNOPSIS
+    Install hbc_windows.exe as a Windows Service using NSSM.
+
+.DESCRIPTION
+    Installs the HeartBeat Client as a Windows Service that starts automatically.
+    Requires NSSM (Non-Sucking Service Manager) in PATH or alongside this script.
+    Requires hbc_windows.exe built via: pyinstaller hbc_windows.spec
+
+.PARAMETER Server
+    HBD server hostname or IP address (required).
+
+.PARAMETER ExePath
+    Path to hbc_windows.exe. Defaults to the directory containing this script.
+
+.PARAMETER ServiceName
+    Windows service name. Default: heartbeat-client
+
+.PARAMETER ConfigFile
+    Path to hbc.json config file. Optional.
+
+.PARAMETER LogFile
+    Path to log file. Default: C:\ProgramData\heartbeat\hbc.log
+
+.PARAMETER Interval
+    Heartbeat interval in seconds. Default: 10
+
+.EXAMPLE
+    .\install_hbc_windows.ps1 -Server hbd.example.com
+    .\install_hbc_windows.ps1 -Server hbd.example.com -ConfigFile C:\ProgramData\heartbeat\hbc.json
+#>
+
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$Server,
+
+    [string]$ExePath = "",
+    [string]$ServiceName = "heartbeat-client",
+    [string]$ConfigFile = "",
+    [string]$LogFile = "C:\ProgramData\heartbeat\hbc.log",
+    [int]$Interval = 10
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+# Locate hbc_windows.exe
+if ($ExePath -eq "") {
+    $ExePath = Join-Path $PSScriptRoot "hbc_windows.exe"
+}
+if (-not (Test-Path $ExePath)) {
+    Write-Error "hbc_windows.exe not found at: $ExePath`nBuild it first with: pyinstaller hbc_windows.spec"
+    exit 1
+}
+
+# Locate NSSM
+$nssm = Get-Command nssm -ErrorAction SilentlyContinue
+if (-not $nssm) {
+    $nssmLocal = Join-Path $PSScriptRoot "nssm.exe"
+    if (Test-Path $nssmLocal) {
+        $nssm = $nssmLocal
+    } else {
+        Write-Error "nssm.exe not found in PATH or alongside this script.`nDownload from https://nssm.cc/download"
+        exit 1
+    }
+} else {
+    $nssm = $nssm.Source
+}
+
+# Build argument list
+$args_list = "--daemon $Server"
+if ($ConfigFile -ne "") {
+    $args_list = "--daemon -c `"$ConfigFile`" $Server"
+}
+if ($LogFile -ne "") {
+    $args_list = "$args_list --log-file `"$LogFile`""
+}
+
+# Create data directory
+$dataDir = "C:\ProgramData\heartbeat"
+if (-not (Test-Path $dataDir)) {
+    New-Item -ItemType Directory -Path $dataDir | Out-Null
+    Write-Host "Created $dataDir"
+}
+
+# Remove existing service if present
+$existing = Get-Service -Name $ServiceName -ErrorAction SilentlyContinue
+if ($existing) {
+    Write-Host "Removing existing service '$ServiceName'..."
+    & $nssm stop $ServiceName 2>$null
+    & $nssm remove $ServiceName confirm
+}
+
+# Install service
+Write-Host "Installing service '$ServiceName'..."
+& $nssm install $ServiceName $ExePath $args_list
+if ($LASTEXITCODE -ne 0) {
+    Write-Error "nssm install failed (exit $LASTEXITCODE)"
+    exit 1
+}
+
+# Configure service
+& $nssm set $ServiceName DisplayName "HeartBeat Client"
+& $nssm set $ServiceName Description "Sends heartbeat and plugin metrics to the HBD monitoring server."
+& $nssm set $ServiceName Start SERVICE_AUTO_START
+& $nssm set $ServiceName AppStdout (Join-Path $dataDir "nssm_stdout.log")
+& $nssm set $ServiceName AppStderr (Join-Path $dataDir "nssm_stderr.log")
+& $nssm set $ServiceName AppRotateFiles 1
+& $nssm set $ServiceName AppRotateBytes 5242880
+
+# Start service
+Write-Host "Starting service '$ServiceName'..."
+& $nssm start $ServiceName
+if ($LASTEXITCODE -ne 0) {
+    Write-Warning "Service installed but failed to start — check logs in $dataDir"
+} else {
+    Write-Host "Service '$ServiceName' started successfully."
+    Write-Host "Log file: $LogFile"
+    Write-Host ""
+    Write-Host "Useful commands:"
+    Write-Host "  nssm status $ServiceName"
+    Write-Host "  nssm stop $ServiceName"
+    Write-Host "  nssm restart $ServiceName"
+    Write-Host "  nssm remove $ServiceName confirm"
+}

scripts/test_nagios.py

@@ -68,8 +68,7 @@ async def test_nagios_runner():
     print(f"   ✓ Collected {len(data)} data points")
     
     print(f"\n4. Results:")
-    print(f"   Overall Status: {data.get('overall_status')} (code: {data.get('overall_status_code')})")
+    print(f"   Data points collected: {len(data)}")
-    print(f"   Plugins Executed: {data.get('plugin_count')}")
     
     # Show individual plugin results
     print(f"\n5. Individual Plugin Results:")

tests/test_configio.py

@@ -0,0 +1,162 @@
+import glob
+import os
+import pytest
+from hbd.server import configio
+
+SAMPLE_YAML = """\
+# Server configuration
+hbd_port: 50004  # HTTP API port
+interval: 20
+users:
+  alice:
+    full_name: Alice Smith
+    admin: true
+notification_channels:
+  pushover_ops:
+    type: pushover
+    token: abc123
+"""
+
+
+def test_read_roundtrip_loads_values(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    assert data["hbd_port"] == 50004
+    assert data["interval"] == 20
+    assert data["users"]["alice"]["full_name"] == "Alice Smith"
+
+
+def test_write_config_creates_backup(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    data["interval"] = 30
+    configio.write_config(str(f), data)
+    backups = configio.list_backups(str(f))
+    assert len(backups) == 1
+    assert ".bak." in backups[0]
+
+
+def test_write_config_preserves_comments(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    data["interval"] = 30
+    configio.write_config(str(f), data)
+    content = f.read_text()
+    assert "# Server configuration" in content
+    assert "# HTTP API port" in content
+
+
+def test_write_config_atomically_replaces_file(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    data["interval"] = 99
+    configio.write_config(str(f), data)
+    assert not (tmp_path / ".hb.yaml.tmp").exists()
+    data2 = configio.read_roundtrip(str(f))
+    assert data2["interval"] == 99
+
+
+def test_write_config_backup_rotation(tmp_path):
+    cfg = tmp_path / ".hb.yaml"
+    cfg.write_text(SAMPLE_YAML)
+    # Pre-create 10 existing backups with old timestamps
+    for i in range(10):
+        (tmp_path / f".hb.yaml.bak.20260101-{i:06d}").write_text("old")
+    data = configio.read_roundtrip(str(cfg))
+    configio.write_config(str(cfg), data)
+    backups = configio.list_backups(str(cfg))
+    assert len(backups) == 10
+    assert not (tmp_path / ".hb.yaml.bak.20260101-000000").exists()
+
+
+def test_list_backups_newest_first(tmp_path):
+    cfg = tmp_path / ".hb.yaml"
+    cfg.write_text(SAMPLE_YAML)
+    for i in range(3):
+        (tmp_path / f".hb.yaml.bak.20260101-{i:02d}0000").write_text("b")
+    backups = configio.list_backups(str(cfg))
+    assert len(backups) == 3
+    assert backups == sorted(backups, reverse=True)
+
+
+def test_apply_structured_section_server_updates_keys(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    configio.apply_structured_section(data, "server", {"interval": 60, "hbd_port": 8080})
+    assert data["interval"] == 60
+    assert data["hbd_port"] == 8080
+
+
+def test_apply_structured_section_server_ignores_unknown_keys(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    configio.apply_structured_section(data, "server", {"interval": 60, "not_a_key": "x"})
+    assert "not_a_key" not in data
+
+
+def test_apply_structured_section_users_replaces_dict(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    new_users = {"bob": {"full_name": "Bob Jones", "admin": False}}
+    configio.apply_structured_section(data, "users", new_users)
+    assert "alice" not in data["users"]
+    assert data["users"]["bob"]["full_name"] == "Bob Jones"
+
+
+def test_apply_yaml_section_notification_channels(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    new_yaml = "email_ops:\n  type: email\n  recipients: [ops@example.com]\n"
+    configio.apply_yaml_section(data, "notification_channels", new_yaml)
+    assert "email_ops" in data["notification_channels"]
+    assert "pushover_ops" not in data["notification_channels"]
+
+
+def test_apply_yaml_section_thresholds_maps_to_threshold_configs(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    configio.apply_yaml_section(data, "thresholds", "default:\n  cpu: 80\n")
+    assert "threshold_configs" in data
+    assert data["threshold_configs"]["default"]["cpu"] == 80
+
+
+def test_apply_yaml_section_dns_replaces_each_key(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    configio.apply_yaml_section(
+        data, "dns",
+        "nsupdate_bin: /usr/bin/nsupdate\ndyndomains: [dyn.example.com]\n"
+    )
+    assert data["nsupdate_bin"] == "/usr/bin/nsupdate"
+    assert data["dyndomains"] == ["dyn.example.com"]
+
+
+def test_apply_yaml_section_unknown_raises(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    with pytest.raises(ValueError, match="Unknown YAML section"):
+        configio.apply_yaml_section(data, "nope", "x: 1\n")
+
+
+def test_apply_structured_section_unknown_raises(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    with pytest.raises(ValueError, match="Unknown structured section"):
+        configio.apply_structured_section(data, "nope", {"x": 1})
+
+
+def test_read_roundtrip_missing_file_raises(tmp_path):
+    with pytest.raises(FileNotFoundError):
+        configio.read_roundtrip(str(tmp_path / "nonexistent.yaml"))

tests/test_handle_datagram.py

@@ -20,7 +20,7 @@ def test_handle_cmd_sends_command():
     import hbdclass
 
     ctx = {
-        "config": {"watchhosts": [], "dyndnshosts": []},
+        "config": {"watchhosts": []},
         "hbdclass": hbdclass,
         "log": dummy_noop,
         "email": dummy_noop,

tests/test_http_config_api.py

@@ -0,0 +1,173 @@
+"""Tests for the config read/write API helpers in http.py."""
+import pytest
+from hbd.server import http
+
+
+def test_mask_config_for_api_masks_user_passwords():
+    config = {
+        "hbd_port": 50004,
+        "interval": 20,
+        "users": {
+            "alice": {"full_name": "Alice", "admin": True, "password": "pbkdf2:sha256:abc"},
+        },
+        "oauth": {},
+    }
+    result = http._mask_config_for_api(config)
+    assert result["users"]["alice"]["password"] == "•••"
+    assert result["users"]["alice"]["full_name"] == "Alice"
+
+
+def test_mask_config_for_api_masks_oauth_client_secret():
+    config = {
+        "hbd_port": 50004,
+        "interval": 20,
+        "users": {},
+        "oauth": {
+            "gitea": {"type": "gitea", "url": "https://git.example.com",
+                      "client_id": "cid", "client_secret": "verysecret"},
+        },
+    }
+    result = http._mask_config_for_api(config)
+    assert result["oauth"]["gitea"]["client_secret"] == "•••"
+    assert result["oauth"]["gitea"]["client_id"] == "cid"
+
+
+def test_mask_config_for_api_includes_server_keys():
+    config = {"hbd_port": 50004, "interval": 20, "users": {}, "oauth": {}}
+    result = http._mask_config_for_api(config)
+    assert result["server"]["hbd_port"] == 50004
+    assert result["server"]["interval"] == 20
+
+
+def test_mask_config_for_api_no_password_in_users_leaves_no_key():
+    config = {
+        "hbd_port": 50004,
+        "users": {"bob": {"full_name": "Bob", "admin": False}},
+        "oauth": {},
+    }
+    result = http._mask_config_for_api(config)
+    assert "password" not in result["users"]["bob"]
+
+
+# ---- configio integration for write path ----
+
+def test_write_path_applies_server_section(tmp_path):
+    cfg = tmp_path / ".hb.yaml"
+    cfg.write_text("hbd_port: 50004\ninterval: 20\nusers: {}\n")
+    from hbd.server import configio
+    data = configio.read_roundtrip(str(cfg))
+    configio.apply_structured_section(data, "server", {"interval": 60})
+    configio.write_config(str(cfg), data)
+    data2 = configio.read_roundtrip(str(cfg))
+    assert data2["interval"] == 60
+    assert data2["hbd_port"] == 50004  # unchanged
+
+
+def test_write_path_applies_yaml_section(tmp_path):
+    cfg = tmp_path / ".hb.yaml"
+    cfg.write_text(
+        "hbd_port: 50004\nnotification_channels:\n  old_ch:\n    type: email\n"
+    )
+    from hbd.server import configio
+    data = configio.read_roundtrip(str(cfg))
+    configio.apply_yaml_section(data, "notification_channels", "new_ch:\n  type: pushover\n")
+    configio.write_config(str(cfg), data)
+    data2 = configio.read_roundtrip(str(cfg))
+    assert "new_ch" in data2["notification_channels"]
+    assert "old_ch" not in data2["notification_channels"]
+
+
+def test_write_path_hashes_plaintext_password(tmp_path):
+    cfg = tmp_path / ".hb.yaml"
+    cfg.write_text("hbd_port: 50004\nusers:\n  alice:\n    full_name: Alice\n    admin: true\n    password: pbkdf2:sha256:old\n")
+    from hbd.server import configio
+    from hbd.server import users as users_mod
+    data = configio.read_roundtrip(str(cfg))
+    # Simulate what the POST handler does: hash plaintext password
+    new_users = {"alice": {"full_name": "Alice", "admin": True, "password": "newplaintext"}}
+    for username, attrs in new_users.items():
+        pw = attrs.get("password", "")
+        if pw and not pw.startswith("pbkdf2:"):
+            attrs["password"] = users_mod.hash_password(pw)
+    configio.apply_structured_section(data, "users", new_users)
+    configio.write_config(str(cfg), data)
+    data2 = configio.read_roundtrip(str(cfg))
+    assert data2["users"]["alice"]["password"].startswith("pbkdf2:")
+    assert data2["users"]["alice"]["password"] != "newplaintext"
+
+
+def test_rollback_restores_backup(tmp_path):
+    cfg = tmp_path / ".hb.yaml"
+    cfg.write_text("hbd_port: 50004\ninterval: 20\n")
+    from hbd.server import configio
+    # Make a change to create a backup
+    data = configio.read_roundtrip(str(cfg))
+    data["interval"] = 99
+    configio.write_config(str(cfg), data)
+    backups = configio.list_backups(str(cfg))
+    assert len(backups) == 1
+    # Read the backup and write it back (simulating rollback)
+    backup_data = configio.read_roundtrip(backups[0])
+    configio.write_config(str(cfg), backup_data)
+    restored = configio.read_roundtrip(str(cfg))
+    assert restored["interval"] == 20
+
+
+def test_write_path_preserves_masked_password(tmp_path):
+    """The "•••" sentinel must preserve the existing hash, not write "•••" to disk."""
+    cfg = tmp_path / ".hb.yaml"
+    original_hash = "pbkdf2:sha256:original_hash"
+    cfg.write_text(
+        f"hbd_port: 50004\nusers:\n  alice:\n    full_name: Alice\n    admin: true\n    password: {original_hash}\n"
+    )
+    from hbd.server import configio
+    from hbd.server import users as users_mod
+    data = configio.read_roundtrip(str(cfg))
+    # Simulate what api_config_post does when client sends "•••" back
+    existing_users = data.get("users") or {}
+    users_payload = {"alice": {"full_name": "Alice", "admin": True, "password": "•••"}}
+    for username, attrs in users_payload.items():
+        pw = attrs.get("password", "")
+        if pw and pw != "•••" and not pw.startswith("pbkdf2:"):
+            attrs["password"] = users_mod.hash_password(pw)
+        elif not pw or pw == "•••":
+            existing_hash = (existing_users.get(username) or {}).get("password", "")
+            if existing_hash:
+                attrs["password"] = existing_hash
+            else:
+                attrs.pop("password", None)
+    configio.apply_structured_section(data, "users", users_payload)
+    configio.write_config(str(cfg), data)
+    data2 = configio.read_roundtrip(str(cfg))
+    assert data2["users"]["alice"]["password"] == original_hash, (
+        f"Expected original hash preserved, got: {data2['users']['alice']['password']!r}"
+    )
+
+
+def test_write_path_preserves_oauth_client_secret(tmp_path):
+    """The "•••" sentinel for oauth client_secret must preserve the existing secret."""
+    cfg = tmp_path / ".hb.yaml"
+    original_secret = "real_client_secret_value"
+    cfg.write_text(
+        f"hbd_port: 50004\noauth:\n  gitea:\n    type: gitea\n    url: https://git.example.com\n"
+        f"    client_id: cid123\n    client_secret: {original_secret}\n"
+    )
+    from hbd.server import configio
+    data = configio.read_roundtrip(str(cfg))
+    # Simulate what api_config_post does when client sends "•••" back for client_secret
+    existing_oauth = data.get("oauth") or {}
+    new_oauth = {"gitea": {"type": "gitea", "url": "https://git.example.com", "client_id": "cid123", "client_secret": "•••"}}
+    for name, attrs in new_oauth.items():
+        cs = attrs.get("client_secret", "")
+        if not cs or cs == "•••":
+            existing_cs = (existing_oauth.get(name) or {}).get("client_secret", "")
+            if existing_cs:
+                attrs["client_secret"] = existing_cs
+            else:
+                attrs.pop("client_secret", None)
+    data["oauth"] = new_oauth
+    configio.write_config(str(cfg), data)
+    data2 = configio.read_roundtrip(str(cfg))
+    assert data2["oauth"]["gitea"]["client_secret"] == original_secret, (
+        f"Expected original secret preserved, got: {data2['oauth']['gitea']['client_secret']!r}"
+    )

tests/test_http_host_info.py

@@ -0,0 +1,174 @@
+"""Tests for _build_host_info helper in http.py."""
+import pytest
+from unittest.mock import MagicMock
+from hbd.server.http import _build_host_info
+
+
+class _FakeConn:
+    def __init__(self, lastbeat):
+        self.lastbeat = lastbeat
+
+
+class _FakeHost:
+    def __init__(self, name="myhost", owner=None, managers=None,
+                 connections=None, os_data=None, plugin_data=None):
+        self.name = name
+        self.owner = owner
+        self.managers = managers or []
+        self.connections = connections or {}
+        self._os_data = os_data
+        self.plugin_data = plugin_data or {}
+
+    def get_latest_plugin_data(self, plugin_name):
+        if plugin_name == "os_info" and self._os_data is not None:
+            return (1234567890.0, self._os_data)
+        return None
+
+
+def test_build_host_info_basic_fields():
+    host = _FakeHost(owner="alice", managers=["bob", "carol"])
+    result = _build_host_info(host)
+    assert result["owner"] == "alice"
+    assert result["managers"] == ["bob", "carol"]
+    assert result["hbc_version"] is None
+    assert result["hbc_type"] is None
+    assert result["last_packet"] is None
+    assert result["thresholds"] is None
+
+
+def test_build_host_info_no_owner():
+    host = _FakeHost()
+    result = _build_host_info(host)
+    assert result["owner"] is None
+    assert result["managers"] == []
+
+
+def test_build_host_info_reads_hbc_from_os_info():
+    host = _FakeHost(os_data={"hbc_version": "5.3.0", "hbc_type": "full"})
+    result = _build_host_info(host)
+    assert result["hbc_version"] == "5.3.0"
+    assert result["hbc_type"] == "full"
+
+
+def test_build_host_info_hbc_none_when_no_os_info():
+    host = _FakeHost(os_data=None)
+    result = _build_host_info(host)
+    assert result["hbc_version"] is None
+    assert result["hbc_type"] is None
+
+
+def test_build_host_info_last_packet_is_max_lastbeat():
+    host = _FakeHost(connections={
+        "IPv4": _FakeConn(1000.0),
+        "IPv6": _FakeConn(2000.0),
+    })
+    result = _build_host_info(host)
+    assert result["last_packet"] == 2000.0
+
+
+def test_build_host_info_last_packet_none_when_no_connections():
+    host = _FakeHost(connections={})
+    result = _build_host_info(host)
+    assert result["last_packet"] is None
+
+
+def test_build_host_info_thresholds_none_without_checker():
+    host = _FakeHost()
+    result = _build_host_info(host, threshold_checker=None)
+    assert result["thresholds"] is None
+
+
+def test_build_host_info_thresholds_sorted_by_metric():
+    from hbd.server.threshold import ThresholdConfig
+    tc_cpu = ThresholdConfig("cpu_monitor.cpu_percent", warning=80.0, critical=95.0)
+    tc_mem = ThresholdConfig("memory_monitor.memory_percent", warning=85.0, critical=98.0)
+
+    checker = MagicMock()
+    checker.get_thresholds_for_host.return_value = {
+        "memory_monitor.memory_percent": tc_mem,
+        "cpu_monitor.cpu_percent": tc_cpu,
+    }
+
+    host = _FakeHost()
+    result = _build_host_info(host, threshold_checker=checker)
+
+    assert result["thresholds"] is not None
+    assert len(result["thresholds"]) == 2
+    assert result["thresholds"][0]["metric"] == "cpu_monitor.cpu_percent"
+    assert result["thresholds"][0]["warning"] == 80.0
+    assert result["thresholds"][0]["critical"] == 95.0
+    assert result["thresholds"][0]["operator"] == ">"
+    assert result["thresholds"][1]["metric"] == "memory_monitor.memory_percent"
+
+
+def test_build_host_info_thresholds_empty_list_when_no_thresholds():
+    checker = MagicMock()
+    checker.get_thresholds_for_host.return_value = {}
+    host = _FakeHost()
+    result = _build_host_info(host, threshold_checker=checker)
+    assert result["thresholds"] == []
+
+
+def test_build_host_info_threshold_null_warning_critical():
+    from hbd.server.threshold import ThresholdConfig
+    tc = ThresholdConfig("rtt.myhost", warning=None, critical=500.0)
+    checker = MagicMock()
+    checker.get_thresholds_for_host.return_value = {"rtt.myhost": tc}
+    host = _FakeHost()
+    result = _build_host_info(host, threshold_checker=checker)
+    assert result["thresholds"][0]["warning"] is None
+    assert result["thresholds"][0]["critical"] == 500.0
+
+
+def test_build_host_info_nagios_operator_serialized():
+    from hbd.server.threshold import ThresholdConfig
+    tc = ThresholdConfig("nagios_runner.check_http", operator="nagios")
+    checker = MagicMock()
+    checker.get_thresholds_for_host.return_value = {"nagios_runner.check_http": tc}
+    host = _FakeHost()
+    result = _build_host_info(host, threshold_checker=checker)
+    assert result["thresholds"][0]["operator"] == "nagios"
+
+
+def test_build_host_info_covers_suffix_matched_metrics():
+    """memory_monitor.percent threshold covers swap_percent via suffix match."""
+    from hbd.server.threshold import ThresholdConfig
+    tc_pct = ThresholdConfig("memory_monitor.percent", warning=85.0, critical=95.0)
+    checker = MagicMock()
+    checker.get_thresholds_for_host.return_value = {"memory_monitor.percent": tc_pct}
+
+    host = _FakeHost(
+        connections={},
+        os_data=None,
+    )
+    # Simulate plugin_data with both percent and swap_percent fields
+    host.plugin_data = {
+        "memory_monitor": [(1234567890.0, {
+            "percent": 80.0,
+            "swap_percent": 25.0,
+            "available_mb": 2000,
+        })]
+    }
+
+    result = _build_host_info(host, threshold_checker=checker)
+    assert result["thresholds"] is not None
+    t = result["thresholds"][0]
+    assert t["metric"] == "memory_monitor.percent"
+    assert t["covers"] == ["memory_monitor.swap_percent"]
+
+
+def test_build_host_info_covers_empty_when_exact_matches_only():
+    """No covers when all plugin fields match their threshold exactly."""
+    from hbd.server.threshold import ThresholdConfig
+    tc_pct = ThresholdConfig("memory_monitor.percent", warning=85.0, critical=95.0)
+    checker = MagicMock()
+    checker.get_thresholds_for_host.return_value = {"memory_monitor.percent": tc_pct}
+
+    host = _FakeHost()
+    host.plugin_data = {
+        "memory_monitor": [(1234567890.0, {"percent": 80.0})]
+    }
+
+    result = _build_host_info(host, threshold_checker=checker)
+    t = result["thresholds"][0]
+    assert t["covers"] == []

tests/test_http_users_me.py

@@ -0,0 +1,123 @@
+"""Tests for PUT /api/0/users/me logic."""
+import pytest
+from hbd.server import users as users_mod
+
+
+def test_hash_password_roundtrip():
+    h = users_mod.hash_password("mysecret")
+    assert h.startswith("pbkdf2:sha256:")
+    assert users_mod.authenticate.__doc__ is not None  # module loaded
+
+
+def test_password_change_requires_correct_current(tmp_path):
+    cfg = tmp_path / ".hb.yaml"
+    initial_hash = users_mod.hash_password("oldpass")
+    cfg.write_text(
+        f"hbd_port: 50004\nusers:\n  alice:\n    full_name: Alice\n    admin: true\n    password: {initial_hash}\n"
+    )
+    users_mod.load_users({"users": {"alice": {"full_name": "Alice", "admin": True, "password": initial_hash}}})
+
+    # Correct current password authenticates
+    assert users_mod.authenticate("alice", "oldpass") is not None
+    # Wrong current password does not authenticate
+    assert users_mod.authenticate("alice", "wrongpass") is None
+
+
+def test_put_users_me_writes_new_fields(tmp_path):
+    """Simulate the write path: read config, update user, write back."""
+    initial_hash = users_mod.hash_password("secret")
+    yaml_content = (
+        "hbd_port: 50004\n"
+        f"users:\n  alice:\n    full_name: Old Name\n    admin: true\n    password: {initial_hash}\n"
+    )
+    cfg = tmp_path / ".hb.yaml"
+    cfg.write_text(yaml_content)
+
+    from hbd.server import configio
+    data = configio.read_roundtrip(str(cfg))
+
+    # Simulate handler updating full_name and avatar
+    user_entry = dict(data["users"]["alice"])
+    user_entry["full_name"] = "New Name"
+    user_entry["avatar"] = "/img/alice.png"
+    data["users"]["alice"] = user_entry
+
+    configio.write_config(str(cfg), data)
+    result = configio.read_roundtrip(str(cfg))
+    assert result["users"]["alice"]["full_name"] == "New Name"
+    assert result["users"]["alice"]["avatar"] == "/img/alice.png"
+    assert result["users"]["alice"]["password"] == initial_hash  # unchanged
+
+
+def test_put_users_me_changes_password(tmp_path):
+    initial_hash = users_mod.hash_password("oldpass")
+    cfg = tmp_path / ".hb.yaml"
+    cfg.write_text(
+        f"hbd_port: 50004\nusers:\n  alice:\n    full_name: Alice\n    password: {initial_hash}\n"
+    )
+    from hbd.server import configio
+    data = configio.read_roundtrip(str(cfg))
+
+    new_hash = users_mod.hash_password("newpass")
+    data["users"]["alice"]["password"] = new_hash
+    configio.write_config(str(cfg), data)
+
+    result = configio.read_roundtrip(str(cfg))
+    # Load users from new config and authenticate with new password
+    new_config = {"users": dict(result["users"])}
+    users_mod.load_users(new_config)
+    assert users_mod.authenticate("alice", "newpass") is not None
+    assert users_mod.authenticate("alice", "oldpass") is None
+
+
+def test_put_users_me_notification_channels(tmp_path):
+    cfg = tmp_path / ".hb.yaml"
+    cfg.write_text(
+        "hbd_port: 50004\n"
+        "notification_channels:\n  pushover_ops:\n    type: pushover\n"
+        "users:\n  alice:\n    full_name: Alice\n    notification_channels: []\n"
+    )
+    from hbd.server import configio
+    data = configio.read_roundtrip(str(cfg))
+    data["users"]["alice"]["notification_channels"] = ["pushover_ops"]
+    configio.write_config(str(cfg), data)
+    result = configio.read_roundtrip(str(cfg))
+    assert result["users"]["alice"]["notification_channels"] == ["pushover_ops"]
+
+
+def test_visible_channels_excludes_private_from_others():
+    """Private channels owned by another user must not appear in the visible set."""
+    from hbd.server import settings as settings_mod
+
+    config = {
+        "notification_channels": {
+            "public_ch":  {"type": "pushover", "token": "t", "user": "u"},
+            "alice_priv": {"type": "email", "owner": "alice", "private": True,
+                           "recipients": ["a@b.com"], "sender": "s@b.com", "smtp_server": "s"},
+            "bob_priv":   {"type": "email", "owner": "bob", "private": True,
+                           "recipients": ["b@b.com"], "sender": "s@b.com", "smtp_server": "s"},
+        }
+    }
+
+    class FakeUser:
+        def __init__(self, username, admin=False):
+            self.username = username
+            self.admin = admin
+
+    alice = FakeUser("alice")
+    bob   = FakeUser("bob")
+    admin = FakeUser("admin", admin=True)
+
+    # Simulate _visible_channels_for_user logic (mirrors http.py implementation)
+    def visible(user):
+        all_channels = config.get("notification_channels") or {}
+        if user.admin:
+            return set(all_channels.keys())
+        return {
+            name for name, cfg in all_channels.items()
+            if not cfg.get("private") or cfg.get("owner") == user.username
+        }
+
+    assert visible(alice) == {"public_ch", "alice_priv"}
+    assert visible(bob)   == {"public_ch", "bob_priv"}
+    assert visible(admin) == {"public_ch", "alice_priv", "bob_priv"}

tests/test_nagios_runner.py

@@ -0,0 +1,99 @@
+import asyncio
+import logging
+import os
+import stat
+
+from hbd.client.plugins.nagios_runner import (
+    NagiosRunnerPlugin,
+    NAGIOS_OK,
+    NAGIOS_WARNING,
+    NAGIOS_CRITICAL,
+    NAGIOS_UNKNOWN,
+)
+
+
+def test_no_commands_sets_skip_reason():
+    plugin = NagiosRunnerPlugin(config={"commands": []})
+    result = asyncio.run(plugin.initialize())
+    assert result is False
+    assert plugin.skip_reason is not None
+    assert "nagios_runner.commands" in plugin.skip_reason
+
+
+def test_stderr_used_when_stdout_empty(tmp_path):
+    script = tmp_path / "check_err.sh"
+    script.write_text("#!/bin/sh\necho 'error from stderr' >&2\nexit 2\n")
+    script.chmod(script.stat().st_mode | stat.S_IEXEC)
+
+    config = {"commands": [{"name": "t", "command": str(script)}], "timeout": 5}
+    plugin = NagiosRunnerPlugin(config=config)
+    asyncio.run(plugin.initialize())
+    data = asyncio.run(plugin._collect_metrics())
+
+    assert "error from stderr" in data["t_output"]
+    assert data["t_status_code"] == NAGIOS_CRITICAL
+
+
+def test_stderr_appended_when_both_present(tmp_path):
+    script = tmp_path / "check_both.sh"
+    script.write_text("#!/bin/sh\necho 'OK - all good'\necho 'extra detail' >&2\nexit 0\n")
+    script.chmod(script.stat().st_mode | stat.S_IEXEC)
+
+    config = {"commands": [{"name": "t", "command": str(script)}], "timeout": 5}
+    plugin = NagiosRunnerPlugin(config=config)
+    asyncio.run(plugin.initialize())
+    data = asyncio.run(plugin._collect_metrics())
+
+    assert "OK - all good" in data["t_output"]
+    assert "extra detail" in data["t_output"]
+    assert data["t_status_code"] == NAGIOS_OK
+
+
+def test_negative_returncode_maps_to_unknown():
+    # kill -9 $$ kills the shell itself; asyncio sees returncode -9
+    config = {"commands": [{"name": "t", "command": "kill -9 $$"}], "timeout": 5}
+    plugin = NagiosRunnerPlugin(config=config)
+    asyncio.run(plugin.initialize())
+    data = asyncio.run(plugin._collect_metrics())
+
+    assert data["t_status_code"] == NAGIOS_UNKNOWN
+    assert "signal" in data["t_output"].lower()
+
+
+def test_absolute_path_not_found_warns(caplog):
+    fake_cmd = "/nonexistent_hbc_test_path/check_something"
+    config = {"commands": [{"name": "t", "command": fake_cmd}]}
+    plugin = NagiosRunnerPlugin(config=config)
+
+    with caplog.at_level(logging.WARNING, logger="plugin.nagios_runner"):
+        asyncio.run(plugin.initialize())
+
+    assert any("not found" in r.message for r in caplog.records)
+
+
+def test_absolute_path_not_executable_warns(caplog, tmp_path):
+    non_exec = tmp_path / "check_test"
+    non_exec.write_text("#!/bin/sh\necho OK\n")
+    non_exec.chmod(0o644)  # readable but not executable
+
+    config = {"commands": [{"name": "t", "command": str(non_exec)}]}
+    plugin = NagiosRunnerPlugin(config=config)
+
+    with caplog.at_level(logging.WARNING, logger="plugin.nagios_runner"):
+        asyncio.run(plugin.initialize())
+
+    assert any("not executable" in r.message for r in caplog.records)
+
+
+def test_relative_path_not_checked(caplog):
+    # Relative paths (resolved via PATH) must not generate warnings
+    config = {"commands": [{"name": "t", "command": "echo OK"}]}
+    plugin = NagiosRunnerPlugin(config=config)
+
+    with caplog.at_level(logging.WARNING, logger="plugin.nagios_runner"):
+        asyncio.run(plugin.initialize())
+
+    assert not any(
+        "not found" in r.message or "not executable" in r.message
+        for r in caplog.records
+    )

tests/test_notification_channels_api.py

@@ -0,0 +1,178 @@
+"""Tests for notification channel CRUD via configio helpers and visibility logic."""
+import pytest
+from hbd.server import configio, settings as settings_mod
+
+
+SAMPLE_YAML = """\
+hbd_port: 50004
+notification_channels:
+  pushover_ops:
+    type: pushover
+    token: abc123
+    user: usr456
+"""
+
+
+# ---------------------------------------------------------------------------
+# configio helpers
+# ---------------------------------------------------------------------------
+
+def test_apply_channel_adds_new_entry(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    configio.apply_channel(data, "email_ops", {"type": "email", "recipients": ["ops@example.com"]})
+    assert "email_ops" in data["notification_channels"]
+    assert data["notification_channels"]["email_ops"]["type"] == "email"
+    # Existing channel preserved
+    assert "pushover_ops" in data["notification_channels"]
+
+
+def test_apply_channel_updates_existing(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    configio.apply_channel(data, "pushover_ops", {"type": "pushover", "token": "new_tok", "user": "new_usr"})
+    assert data["notification_channels"]["pushover_ops"]["token"] == "new_tok"
+
+
+def test_apply_channel_creates_section_if_absent():
+    data = {"hbd_port": 50004}
+    configio.apply_channel(data, "test_ch", {"type": "pushover", "token": "t", "user": "u"})
+    assert "notification_channels" in data
+    assert "test_ch" in data["notification_channels"]
+
+
+def test_delete_channel_removes_entry(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    configio.delete_channel(data, "pushover_ops")
+    assert "pushover_ops" not in data["notification_channels"]
+
+
+def test_delete_channel_noop_for_missing():
+    data = {"notification_channels": {"ch1": {"type": "pushover"}}}
+    configio.delete_channel(data, "nonexistent")  # must not raise
+    assert "ch1" in data["notification_channels"]
+
+
+def test_delete_channel_noop_when_no_section():
+    data = {}
+    configio.delete_channel(data, "anything")  # must not raise
+
+
+def test_apply_channel_persisted_after_write(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    configio.apply_channel(data, "signal_ops", {"type": "signal", "user": "+1", "recipient": "+2"})
+    configio.write_config(str(f), data)
+    result = configio.read_roundtrip(str(f))
+    assert "signal_ops" in result["notification_channels"]
+    assert result["notification_channels"]["signal_ops"]["user"] == "+1"
+    # Original channel preserved
+    assert "pushover_ops" in result["notification_channels"]
+
+
+def test_delete_channel_persisted_after_write(tmp_path):
+    f = tmp_path / ".hb.yaml"
+    f.write_text(SAMPLE_YAML)
+    data = configio.read_roundtrip(str(f))
+    configio.delete_channel(data, "pushover_ops")
+    configio.write_config(str(f), data)
+    result = configio.read_roundtrip(str(f))
+    assert "pushover_ops" not in (result.get("notification_channels") or {})
+
+
+# ---------------------------------------------------------------------------
+# Visibility logic (mirrors http.py _visible_channels_for_user)
+# ---------------------------------------------------------------------------
+
+def _visible(config, user):
+    """Local copy of the visibility helper for unit testing without the HTTP layer."""
+    all_channels = config.get("notification_channels") or {}
+    if user.get("admin"):
+        return set(all_channels.keys())
+    username = user["username"]
+    return {
+        name for name, cfg in all_channels.items()
+        if isinstance(cfg, dict) and (not cfg.get("private") or cfg.get("owner") == username)
+    }
+
+
+CONFIG_VISIBILITY = {
+    "notification_channels": {
+        "pub_ch":      {"type": "pushover", "token": "t", "user": "u"},
+        "alice_priv":  {"type": "email", "owner": "alice", "private": True,
+                        "recipients": ["a@a.com"], "sender": "s@a.com", "smtp_server": "s"},
+        "bob_priv":    {"type": "signal", "owner": "bob", "private": True,
+                        "user": "+1", "recipient": "+2"},
+        "admin_owned": {"type": "pushover", "token": "t2", "user": "u2", "owner": "adminuser"},
+    }
+}
+
+
+def test_public_channel_visible_to_all():
+    for uname in ("alice", "bob", "carol"):
+        user = {"username": uname, "admin": False}
+        assert "pub_ch" in _visible(CONFIG_VISIBILITY, user)
+
+
+def test_private_channel_visible_only_to_owner():
+    alice = {"username": "alice", "admin": False}
+    bob   = {"username": "bob",   "admin": False}
+    carol = {"username": "carol", "admin": False}
+
+    assert "alice_priv" in _visible(CONFIG_VISIBILITY, alice)
+    assert "alice_priv" not in _visible(CONFIG_VISIBILITY, bob)
+    assert "alice_priv" not in _visible(CONFIG_VISIBILITY, carol)
+
+    assert "bob_priv" in _visible(CONFIG_VISIBILITY, bob)
+    assert "bob_priv" not in _visible(CONFIG_VISIBILITY, alice)
+
+
+def test_admin_sees_all_channels():
+    admin = {"username": "adminuser", "admin": True}
+    visible = _visible(CONFIG_VISIBILITY, admin)
+    assert visible == {"pub_ch", "alice_priv", "bob_priv", "admin_owned"}
+
+
+def test_admin_owned_channel_is_public_by_default():
+    alice = {"username": "alice", "admin": False}
+    assert "admin_owned" in _visible(CONFIG_VISIBILITY, alice)
+
+
+# ---------------------------------------------------------------------------
+# Channel type schemas
+# ---------------------------------------------------------------------------
+
+def test_all_required_types_in_schema():
+    for t in ("pushover", "email", "signal", "matrix", "sms_voipms"):
+        assert t in settings_mod.CHANNEL_TYPE_SCHEMAS
+
+
+def test_schema_fields_have_required_keys():
+    for type_id, schema in settings_mod.CHANNEL_TYPE_SCHEMAS.items():
+        assert "label" in schema, f"{type_id} missing label"
+        assert "fields" in schema, f"{type_id} missing fields"
+        for f in schema["fields"]:
+            for k in ("key", "label", "type", "required"):
+                assert k in f, f"{type_id} field missing {k!r}"
+
+
+def test_secret_fields_use_secret_type():
+    """Known secret fields must be typed 'secret' so the UI masks them."""
+    secret_keys = {"token", "user_key", "api_key", "api_password",
+                   "smtp_password", "access_token"}
+    for type_id, schema in settings_mod.CHANNEL_TYPE_SCHEMAS.items():
+        for f in schema["fields"]:
+            if f["key"] in secret_keys:
+                assert f["type"] == "secret", (
+                    f"{type_id}.{f['key']} should be type 'secret'"
+                )
+
+
+def test_channel_labels_not_empty():
+    for type_id, schema in settings_mod.CHANNEL_TYPE_SCHEMAS.items():
+        assert schema["label"].strip(), f"{type_id} has empty label"

tests/test_oauth.py

@@ -0,0 +1,602 @@
+import logging
+import time as time_mod
+from unittest.mock import AsyncMock, MagicMock, patch
+from urllib.parse import urlparse, parse_qs
+
+import pytest
+
+from hbd.server import oauth
+from hbd.server import users as users_mod
+from hbd.server.users import User
+
+
+CFG_OFF = {}
+CFG_ON = {
+    "oauth": {
+        "gitea": {
+            "url": "https://git.example.com",
+            "client_id": "cid",
+            "client_secret": "csec",
+        }
+    }
+}
+CFG_PARTIAL = {"oauth": {"gitea": {"url": "https://git.example.com"}}}
+
+
+@pytest.fixture(autouse=True)
+def clear_oauth_states():
+    oauth._states.clear()
+    yield
+    oauth._states.clear()
+
+
+@pytest.fixture(autouse=True)
+def reset_users_dict():
+    original = dict(users_mod.users)
+    yield
+    users_mod.users = original
+
+
+
+def test_make_state_returns_unique_tokens():
+    s1 = oauth.make_state()
+    s2 = oauth.make_state()
+    assert s1 != s2
+    assert len(s1) == 64  # 32 bytes hex
+
+
+def test_validate_state_valid():
+    state = oauth.make_state()
+    assert oauth.validate_state(state) is True
+
+
+def test_validate_state_consumed_on_use():
+    state = oauth.make_state()
+    oauth.validate_state(state)
+    assert oauth.validate_state(state) is False  # replay rejected
+
+
+def test_validate_state_unknown():
+    assert oauth.validate_state("notastate") is False
+
+
+def test_validate_state_expired(monkeypatch):
+    state = oauth.make_state()
+    # Wind expiry into the past
+    monkeypatch.setitem(oauth._states, state, time_mod.time() - 1000)
+    assert oauth.validate_state(state) is False
+
+
+def _reset_users(entries=None):
+    users_mod.users = entries or {}
+
+
+def test_provision_oauth_user_new():
+    _reset_users()
+    user = users_mod.provision_oauth_user("gituser", "Git User", "https://example.com/avatar.png")
+    assert user.username == "gituser"
+    assert user.full_name == "Git User"
+    assert user.avatar == "https://example.com/avatar.png"
+    assert user.admin is False
+    assert user.password_hash == ""
+    assert "gituser" in users_mod.users
+
+
+def test_provision_oauth_user_no_password_login():
+    _reset_users()
+    user = users_mod.provision_oauth_user("gituser", "Git User", "")
+    assert user.check_password("anything") is False
+
+
+def test_provision_oauth_user_existing_updates_profile():
+    existing = User(
+        username="alice",
+        full_name="Old Name",
+        avatar="old.png",
+        password_hash="pbkdf2:sha256:1:salt:abc",
+        admin=True,
+        notification_channels=["chan1"],
+    )
+    _reset_users({"alice": existing})
+    user = users_mod.provision_oauth_user("alice", "New Name", "new.png")
+    assert user.full_name == "New Name"
+    assert user.avatar == "new.png"
+    # Preserved
+    assert user.admin is True
+    assert user.password_hash == "pbkdf2:sha256:1:salt:abc"
+    assert user.notification_channels == ["chan1"]
+
+
+def test_provision_oauth_user_does_not_overwrite_with_empty():
+    existing = User(username="bob", full_name="Bob", avatar="bob.png")
+    _reset_users({"bob": existing})
+    user = users_mod.provision_oauth_user("bob", "", "")
+    assert user.full_name == "Bob"
+    assert user.avatar == "bob.png"
+
+
+def test_provision_oauth_user_survives_config_reload():
+    _reset_users()
+    users_mod.provision_oauth_user("oauthonly", "OAuth Only", "https://example.com/a.png")
+    assert "oauthonly" in users_mod.users
+    # Reload with empty config — OAuth user should survive
+    users_mod.load_users({})
+    assert "oauthonly" in users_mod.users
+
+
+
+# ---------------------------------------------------------------------------
+# Integration-style tests: callback logic chain
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_callback_invalid_state_rejects():
+    """Verify validate_state returns False for unknown state tokens."""
+    fake_state = "this-is-not-a-real-state"
+    assert oauth.validate_state(fake_state) is False
+
+
+@pytest.mark.asyncio
+async def test_full_oauth_flow_chain():
+    """Integration-style test: state → exchange → fetch → provision chain."""
+    p = _gitea_provider()
+    redirect_uri = "https://hbd.example.com/login/oauth/gitea/callback"
+
+    state = oauth.make_state()
+    assert oauth.validate_state(state) is True
+
+    mock_token_response = AsyncMock()
+    mock_token_response.status = 200
+    mock_token_response.json = AsyncMock(return_value={"access_token": "flow_token"})
+
+    mock_user_response = AsyncMock()
+    mock_user_response.status = 200
+    mock_user_response.json = AsyncMock(return_value={
+        "login": "flowuser",
+        "full_name": "Flow User",
+        "avatar_url": "https://git.example.com/avatars/flow.png",
+    })
+
+    mock_session = MagicMock()
+    mock_session.post = MagicMock(return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_token_response),
+        __aexit__=AsyncMock(return_value=False),
+    ))
+    mock_session.get = MagicMock(return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_user_response),
+        __aexit__=AsyncMock(return_value=False),
+    ))
+
+    with patch("hbd.server.oauth.aiohttp.ClientSession", return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_session),
+        __aexit__=AsyncMock(return_value=False),
+    )):
+        token = await oauth.exchange_code(p, "authcode", redirect_uri)
+        profile = await oauth.fetch_user(p, token)
+
+    assert token == "flow_token"
+    assert profile["login"] == "flowuser"
+
+    _reset_users()
+    user = users_mod.provision_oauth_user(
+        profile["login"], profile["full_name"], profile["avatar_url"]
+    )
+    assert user.username == "flowuser"
+    assert user.check_password("anything") is False
+
+
+# ---------------------------------------------------------------------------
+# get_providers()
+# ---------------------------------------------------------------------------
+
+CFG_GITHUB = {
+    "oauth": {
+        "github": {"type": "github", "client_id": "ghid", "client_secret": "ghs"},
+    }
+}
+
+CFG_NEXTCLOUD = {
+    "oauth": {
+        "nc": {
+            "type": "nextcloud",
+            "url": "https://nc.example.com",
+            "client_id": "ncid",
+            "client_secret": "ncs",
+        }
+    }
+}
+
+CFG_MULTI = {
+    "oauth": {
+        "mygitea": {
+            "type": "gitea",
+            "url": "https://git.example.com",
+            "client_id": "cid",
+            "client_secret": "cs",
+            "label": "Work Gitea",
+            "logo": "https://example.com/logo.png",
+        },
+        "github": {"type": "github", "client_id": "ghid", "client_secret": "ghs"},
+        "nc": {
+            "type": "nextcloud",
+            "url": "https://nc.example.com",
+            "client_id": "ncid",
+            "client_secret": "ncs",
+        },
+    }
+}
+
+
+def test_get_providers_backward_compat_no_type_field():
+    """Old config without 'type' defaults to gitea."""
+    providers = oauth.get_providers(CFG_ON)
+    assert len(providers) == 1
+    p = providers[0]
+    assert p.name == "gitea"
+    assert p.type == "gitea"
+    assert p.label == "Gitea"
+    assert p.client_id == "cid"
+    assert p.authorize_url == "https://git.example.com/login/oauth/authorize"
+    assert p.token_url == "https://git.example.com/login/oauth/access_token"
+    assert p.profile_url == "https://git.example.com/api/v1/user"
+    assert p.scope == "user:email"
+    assert p.profile_data_path == []
+
+
+def test_get_providers_multiple():
+    providers = oauth.get_providers(CFG_MULTI)
+    assert len(providers) == 3
+    names = [p.name for p in providers]
+    assert "mygitea" in names
+    assert "github" in names
+    assert "nc" in names
+
+
+def test_get_providers_custom_label_and_logo():
+    providers = oauth.get_providers(CFG_MULTI)
+    gitea = next(p for p in providers if p.name == "mygitea")
+    assert gitea.label == "Work Gitea"
+    assert gitea.logo == "https://example.com/logo.png"
+
+
+def test_get_providers_github_default_label():
+    providers = oauth.get_providers(CFG_GITHUB)
+    assert providers[0].label == "GitHub"
+    assert providers[0].logo == ""
+
+
+def test_get_providers_github_fixed_urls():
+    providers = oauth.get_providers(CFG_GITHUB)
+    p = providers[0]
+    assert p.authorize_url == "https://github.com/login/oauth/authorize"
+    assert p.token_url == "https://github.com/login/oauth/access_token"
+    assert p.profile_url == "https://api.github.com/user"
+    assert p.scope == "read:user"
+
+
+def test_get_providers_nextcloud_urls_and_path():
+    providers = oauth.get_providers(CFG_NEXTCLOUD)
+    p = providers[0]
+    assert p.authorize_url == "https://nc.example.com/apps/oauth2/authorize"
+    assert p.token_url == "https://nc.example.com/apps/oauth2/api/v1/token"
+    assert p.profile_url == "https://nc.example.com/ocs/v2.php/cloud/user?format=json"
+    assert p.profile_data_path == ["ocs", "data"]
+    assert p.scope == ""
+
+
+def test_get_providers_skips_missing_client_id(caplog):
+    cfg = {"oauth": {"gitea": {"url": "https://git.example.com", "client_secret": "cs"}}}
+    with caplog.at_level(logging.WARNING, logger="hbd.server.oauth"):
+        result = oauth.get_providers(cfg)
+    assert result == []
+    assert "missing" in caplog.text.lower()
+
+
+def test_get_providers_skips_missing_client_secret(caplog):
+    cfg = {"oauth": {"gitea": {"url": "https://git.example.com", "client_id": "cid"}}}
+    with caplog.at_level(logging.WARNING, logger="hbd.server.oauth"):
+        result = oauth.get_providers(cfg)
+    assert result == []
+    assert "missing" in caplog.text.lower()
+
+
+def test_get_providers_skips_missing_url_for_gitea(caplog):
+    cfg = {"oauth": {"gitea": {"type": "gitea", "client_id": "cid", "client_secret": "cs"}}}
+    with caplog.at_level(logging.WARNING, logger="hbd.server.oauth"):
+        result = oauth.get_providers(cfg)
+    assert result == []
+    assert "url" in caplog.text.lower()
+
+
+def test_get_providers_skips_missing_url_for_nextcloud(caplog):
+    cfg = {"oauth": {"nc": {"type": "nextcloud", "client_id": "cid", "client_secret": "cs"}}}
+    with caplog.at_level(logging.WARNING, logger="hbd.server.oauth"):
+        result = oauth.get_providers(cfg)
+    assert result == []
+    assert "url" in caplog.text.lower()
+
+
+def test_get_providers_github_no_url_required():
+    providers = oauth.get_providers(CFG_GITHUB)
+    assert len(providers) == 1
+
+
+def test_get_providers_skips_unknown_type(caplog):
+    cfg = {"oauth": {"mystery": {"type": "saml", "client_id": "cid", "client_secret": "cs"}}}
+    import logging
+    with caplog.at_level(logging.WARNING, logger="hbd.server.oauth"):
+        result = oauth.get_providers(cfg)
+    assert result == []
+    assert "saml" in caplog.text
+
+
+def test_get_providers_empty_config():
+    assert oauth.get_providers({}) == []
+    assert oauth.get_providers(CFG_OFF) == []
+
+
+# ---------------------------------------------------------------------------
+# build_auth_url / exchange_code / fetch_user (generic, ResolvedProvider-based)
+# ---------------------------------------------------------------------------
+
+def _gitea_provider() -> oauth.ResolvedProvider:
+    return oauth.get_providers(CFG_ON)[0]
+
+
+def _github_provider() -> oauth.ResolvedProvider:
+    return oauth.get_providers(CFG_GITHUB)[0]
+
+
+def _nextcloud_provider() -> oauth.ResolvedProvider:
+    return oauth.get_providers(CFG_NEXTCLOUD)[0]
+
+
+def test_build_auth_url_gitea():
+    p = _gitea_provider()
+    url = oauth.build_auth_url(p, "teststate", "https://hbd.example.com/login/oauth/gitea/callback")
+    parsed = urlparse(url)
+    qs = parse_qs(parsed.query)
+    assert parsed.netloc == "git.example.com"
+    assert parsed.path == "/login/oauth/authorize"
+    assert qs["client_id"] == ["cid"]
+    assert qs["state"] == ["teststate"]
+    assert qs["scope"] == ["user:email"]
+    assert qs["response_type"] == ["code"]
+    assert qs["redirect_uri"] == ["https://hbd.example.com/login/oauth/gitea/callback"]
+
+
+def test_build_auth_url_github():
+    p = _github_provider()
+    url = oauth.build_auth_url(p, "st", "https://hbd.example.com/login/oauth/github/callback")
+    parsed = urlparse(url)
+    qs = parse_qs(parsed.query)
+    assert parsed.netloc == "github.com"
+    assert qs["scope"] == ["read:user"]
+
+
+def test_build_auth_url_nextcloud_no_scope_param():
+    """Nextcloud scope is empty — the 'scope' key must be absent from the URL."""
+    p = _nextcloud_provider()
+    url = oauth.build_auth_url(p, "st", "https://hbd.example.com/login/oauth/nc/callback")
+    qs = parse_qs(urlparse(url).query)
+    assert "scope" not in qs
+
+
+@pytest.mark.asyncio
+async def test_exchange_code_generic_returns_token():
+    p = _gitea_provider()
+    redirect_uri = "https://hbd.example.com/login/oauth/gitea/callback"
+    mock_response = AsyncMock()
+    mock_response.status = 200
+    mock_response.json = AsyncMock(return_value={"access_token": "tok123"})
+
+    mock_session = MagicMock()
+    mock_session.post = MagicMock(return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_response),
+        __aexit__=AsyncMock(return_value=False),
+    ))
+
+    with patch("hbd.server.oauth.aiohttp.ClientSession", return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_session),
+        __aexit__=AsyncMock(return_value=False),
+    )):
+        token = await oauth.exchange_code(p, "mycode", redirect_uri)
+    assert token == "tok123"
+
+
+@pytest.mark.asyncio
+async def test_exchange_code_sends_accept_json():
+    """Accept: application/json must be present for all providers (required by GitHub)."""
+    p = _github_provider()
+    captured_headers = {}
+
+    mock_response = AsyncMock()
+    mock_response.status = 200
+    mock_response.json = AsyncMock(return_value={"access_token": "ghtoken"})
+
+    mock_session = MagicMock()
+
+    def capture_post(url, **kwargs):
+        captured_headers.update(kwargs.get("headers", {}))
+        return AsyncMock(
+            __aenter__=AsyncMock(return_value=mock_response),
+            __aexit__=AsyncMock(return_value=False),
+        )
+
+    mock_session.post = capture_post
+
+    with patch("hbd.server.oauth.aiohttp.ClientSession", return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_session),
+        __aexit__=AsyncMock(return_value=False),
+    )):
+        await oauth.exchange_code(p, "code", "https://hbd.example.com/login/oauth/github/callback")
+
+    assert captured_headers.get("Accept") == "application/json"
+
+
+@pytest.mark.asyncio
+async def test_exchange_code_raises_on_error_status():
+    p = _gitea_provider()
+    mock_response = AsyncMock()
+    mock_response.status = 401
+    mock_response.text = AsyncMock(return_value="unauthorized")
+
+    mock_session = MagicMock()
+    mock_session.post = MagicMock(return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_response),
+        __aexit__=AsyncMock(return_value=False),
+    ))
+
+    with patch("hbd.server.oauth.aiohttp.ClientSession", return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_session),
+        __aexit__=AsyncMock(return_value=False),
+    )):
+        with pytest.raises(oauth.OAuthError):
+            await oauth.exchange_code(p, "badcode", "https://hbd.example.com/login/oauth/gitea/callback")
+
+
+@pytest.mark.asyncio
+async def test_exchange_code_raises_when_no_access_token():
+    p = _gitea_provider()
+    mock_response = AsyncMock()
+    mock_response.status = 200
+    mock_response.json = AsyncMock(return_value={"error": "bad_request"})
+
+    mock_session = MagicMock()
+    mock_session.post = MagicMock(return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_response),
+        __aexit__=AsyncMock(return_value=False),
+    ))
+
+    with patch("hbd.server.oauth.aiohttp.ClientSession", return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_session),
+        __aexit__=AsyncMock(return_value=False),
+    )):
+        with pytest.raises(oauth.OAuthError):
+            await oauth.exchange_code(p, "mycode", "https://hbd.example.com/login/oauth/gitea/callback")
+
+
+@pytest.mark.asyncio
+async def test_fetch_user_gitea_returns_profile():
+    p = _gitea_provider()
+    mock_response = AsyncMock()
+    mock_response.status = 200
+    mock_response.json = AsyncMock(return_value={
+        "login": "alice",
+        "full_name": "Alice Smith",
+        "avatar_url": "https://git.example.com/avatars/alice.png",
+    })
+
+    mock_session = MagicMock()
+    mock_session.get = MagicMock(return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_response),
+        __aexit__=AsyncMock(return_value=False),
+    ))
+
+    with patch("hbd.server.oauth.aiohttp.ClientSession", return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_session),
+        __aexit__=AsyncMock(return_value=False),
+    )):
+        profile = await oauth.fetch_user(p, "tok123")
+
+    assert profile == {
+        "login": "alice",
+        "full_name": "Alice Smith",
+        "avatar_url": "https://git.example.com/avatars/alice.png",
+    }
+
+
+@pytest.mark.asyncio
+async def test_fetch_user_github_maps_name_field():
+    p = _github_provider()
+    mock_response = AsyncMock()
+    mock_response.status = 200
+    mock_response.json = AsyncMock(return_value={
+        "login": "bobgh",
+        "name": "Bob GitHub",
+        "avatar_url": "https://avatars.githubusercontent.com/u/1",
+    })
+
+    mock_session = MagicMock()
+    mock_session.get = MagicMock(return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_response),
+        __aexit__=AsyncMock(return_value=False),
+    ))
+
+    with patch("hbd.server.oauth.aiohttp.ClientSession", return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_session),
+        __aexit__=AsyncMock(return_value=False),
+    )):
+        profile = await oauth.fetch_user(p, "ghtoken")
+
+    assert profile["login"] == "bobgh"
+    assert profile["full_name"] == "Bob GitHub"
+    assert profile["avatar_url"] == "https://avatars.githubusercontent.com/u/1"
+
+
+@pytest.mark.asyncio
+async def test_fetch_user_nextcloud_nested_extraction():
+    """Nextcloud profile is nested under ocs.data; avatar is absent."""
+    p = _nextcloud_provider()
+    mock_response = AsyncMock()
+    mock_response.status = 200
+    mock_response.json = AsyncMock(return_value={
+        "ocs": {
+            "meta": {"status": "ok", "statuscode": 200},
+            "data": {
+                "id": "ncuser",
+                "display-name": "NC User",
+                "email": "nc@example.com",
+            },
+        }
+    })
+
+    mock_session = MagicMock()
+    mock_session.get = MagicMock(return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_response),
+        __aexit__=AsyncMock(return_value=False),
+    ))
+
+    with patch("hbd.server.oauth.aiohttp.ClientSession", return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_session),
+        __aexit__=AsyncMock(return_value=False),
+    )):
+        profile = await oauth.fetch_user(p, "nctoken")
+
+    assert profile["login"] == "ncuser"
+    assert profile["full_name"] == "NC User"
+    assert profile["avatar_url"] == ""  # Nextcloud has no avatar field
+
+
+@pytest.mark.asyncio
+async def test_fetch_user_raises_on_error_status():
+    p = _gitea_provider()
+    mock_response = AsyncMock()
+    mock_response.status = 401
+    mock_response.text = AsyncMock(return_value="unauthorized")
+
+    mock_session = MagicMock()
+    mock_session.get = MagicMock(return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_response),
+        __aexit__=AsyncMock(return_value=False),
+    ))
+
+    with patch("hbd.server.oauth.aiohttp.ClientSession", return_value=AsyncMock(
+        __aenter__=AsyncMock(return_value=mock_session),
+        __aexit__=AsyncMock(return_value=False),
+    )):
+        with pytest.raises(oauth.OAuthError):
+            await oauth.fetch_user(p, "badtoken")
+
+
+def test_is_enabled_with_valid_provider():
+    assert oauth.is_enabled(CFG_ON) is True
+
+
+def test_is_enabled_false_when_no_providers():
+    assert oauth.is_enabled(CFG_OFF) is False
+
+
+def test_is_enabled_false_partial_config():
+    assert oauth.is_enabled(CFG_PARTIAL) is False

tests/test_plugin.py

@@ -0,0 +1,83 @@
+import asyncio
+import logging
+import textwrap
+
+from hbd.client.plugin import PluginLoader, PluginRegistry
+
+
+def test_plugin_skip_reason_defaults_none(tmp_path):
+    plugin_code = textwrap.dedent("""
+        from hbd.client.plugin import MonitorPlugin
+
+        class MinimalPlugin(MonitorPlugin):
+            name = "minimal"
+            version = "1.0.0"
+            interval = 60
+
+            async def initialize(self):
+                return True
+
+            async def _collect_metrics(self):
+                return {}
+    """)
+    (tmp_path / "minimal.py").write_text(plugin_code)
+    registry = PluginRegistry()
+    loader = PluginLoader(registry)
+    asyncio.run(loader.load_from_directory(tmp_path))
+    plugin = registry.get("minimal")
+    assert plugin is not None
+    assert plugin.skip_reason is None
+
+
+def test_loader_logs_info_when_skip_reason_set(tmp_path, caplog):
+    plugin_code = textwrap.dedent("""
+        from hbd.client.plugin import MonitorPlugin
+
+        class SkippablePlugin(MonitorPlugin):
+            name = "skippable"
+            version = "1.0.0"
+            interval = 60
+
+            async def initialize(self):
+                self.skip_reason = "not configured in yaml"
+                return False
+
+            async def _collect_metrics(self):
+                return {}
+    """)
+    (tmp_path / "skippable.py").write_text(plugin_code)
+    registry = PluginRegistry()
+    loader = PluginLoader(registry)
+
+    with caplog.at_level(logging.INFO, logger="plugin.loader"):
+        count = asyncio.run(loader.load_from_directory(tmp_path))
+
+    assert count == 0
+    assert any("skipped: not configured in yaml" in r.message for r in caplog.records)
+    assert not any("failed initialization" in r.message for r in caplog.records)
+
+
+def test_loader_logs_warning_when_no_skip_reason(tmp_path, caplog):
+    plugin_code = textwrap.dedent("""
+        from hbd.client.plugin import MonitorPlugin
+
+        class FailPlugin(MonitorPlugin):
+            name = "fail"
+            version = "1.0.0"
+            interval = 60
+
+            async def initialize(self):
+                return False
+
+            async def _collect_metrics(self):
+                return {}
+    """)
+    (tmp_path / "fail_plugin.py").write_text(plugin_code)
+    registry = PluginRegistry()
+    loader = PluginLoader(registry)
+
+    with caplog.at_level(logging.WARNING, logger="plugin.loader"):
+        count = asyncio.run(loader.load_from_directory(tmp_path))
+
+    assert count == 0
+    assert any("failed initialization" in r.message for r in caplog.records)

tests/test_settings_sections.py

@@ -0,0 +1,114 @@
+import pytest
+from hbd.server import settings as settings_mod
+
+CFG = {
+    "hbd_port": 50004,
+    "interval": 20,
+    "grace": 2,
+    "users": {
+        "alice": {"full_name": "Alice Smith", "admin": True, "password": "pbkdf2:sha256:abc",
+                  "notification_channels": ["pushover_ops"]},
+    },
+    "oauth": {
+        "gitea": {"type": "gitea", "url": "https://git.example.com",
+                  "client_id": "cid", "client_secret": "csec", "label": "Sign in with Gitea"},
+    },
+    "notification_channels": {
+        "pushover_ops": {"type": "pushover", "token": "tok", "user": "usr"},
+    },
+    "hosts": {},
+}
+
+
+def test_sections_have_section_mode():
+    sections = settings_mod.get_settings_sections(CFG)
+    for s in sections:
+        assert "section_mode" in s, f"Section {s['id']} missing section_mode"
+        assert s["section_mode"] in ("form", "yaml", "channels", "hosts")
+
+
+def test_sections_have_api_section():
+    sections = settings_mod.get_settings_sections(CFG)
+    for s in sections:
+        assert "api_section" in s, f"Section {s['id']} missing api_section"
+
+
+def test_network_section_has_editable_fields():
+    sections = settings_mod.get_settings_sections(CFG)
+    network = next(s for s in sections if s["id"] == "network")
+    assert network["section_mode"] == "form"
+    assert network["api_section"] == "server"
+    editable = [f for f in network["fields"] if f["editable"]]
+    assert len(editable) >= 2  # hbd_port, ws_port at minimum
+
+
+def test_yaml_sections_have_correct_mode():
+    sections = settings_mod.get_settings_sections(CFG)
+    yaml_sections = {s["id"]: s for s in sections if s["section_mode"] == "yaml"}
+    assert "channels" not in yaml_sections  # now uses "channels" mode
+    assert "hosts" not in yaml_sections     # now uses "hosts" mode
+    assert "thresholds" in yaml_sections
+    assert "dns" in yaml_sections
+    assert yaml_sections["thresholds"]["api_section"] == "thresholds"
+    assert yaml_sections["dns"]["api_section"] == "dns"
+
+
+def test_hosts_section_uses_hosts_mode():
+    sections = settings_mod.get_settings_sections(CFG)
+    hosts_sec = next(s for s in sections if s["id"] == "hosts")
+    assert hosts_sec["section_mode"] == "hosts"
+    assert hosts_sec["api_section"] == "hosts"
+
+
+def test_channels_section_uses_channels_mode():
+    sections = settings_mod.get_settings_sections(CFG)
+    ch_sec = next(s for s in sections if s["id"] == "channels")
+    assert ch_sec["section_mode"] == "channels"
+    assert ch_sec["api_section"] == "notification_channels"
+    assert len(ch_sec["channels"]) == 1
+    ch = ch_sec["channels"][0]
+    assert ch["name"] == "pushover_ops"
+    assert ch["type"] == "pushover"
+    assert "owner" in ch
+    assert "private" in ch
+
+
+def test_channel_type_schemas_exported():
+    assert hasattr(settings_mod, "CHANNEL_TYPE_SCHEMAS")
+    for required_type in ("pushover", "email", "signal", "matrix", "sms_voipms"):
+        assert required_type in settings_mod.CHANNEL_TYPE_SCHEMAS
+        schema = settings_mod.CHANNEL_TYPE_SCHEMAS[required_type]
+        assert "label" in schema
+        assert "fields" in schema
+        for f in schema["fields"]:
+            assert "key" in f
+            assert "type" in f
+            assert "required" in f
+
+
+def test_oauth_section_exists():
+    sections = settings_mod.get_settings_sections(CFG)
+    oauth = next((s for s in sections if s["id"] == "oauth"), None)
+    assert oauth is not None
+    assert oauth["section_mode"] == "form"
+    assert oauth["api_section"] == "oauth"
+    assert len(oauth["providers"]) == 1
+    assert oauth["providers"][0]["name"] == "gitea"
+    assert oauth["providers"][0]["client_secret"] == "•••"
+
+
+def test_all_channel_names_returned():
+    result = settings_mod.get_settings_data(CFG)
+    assert "all_channel_names" in result
+    assert "pushover_ops" in result["all_channel_names"]
+
+
+def test_users_section_has_user_list():
+    sections = settings_mod.get_settings_sections(CFG)
+    users_sec = next(s for s in sections if s["id"] == "users")
+    assert users_sec["section_mode"] == "form"
+    assert users_sec["api_section"] == "users"
+    assert len(users_sec["users"]) == 1
+    assert users_sec["users"][0]["username"] == "alice"
+    # Password hash never exposed
+    assert "password" not in users_sec["users"][0]

tox.ini

@@ -1,9 +1,8 @@
 [tox]
 envlist = py, lint, mypy
-skipsdist = True
 
 [testenv]
-deps = -rrequirements-dev.txt
+extras = dev
 commands =
     pytest -q