version 5.2.5

Older hbd clients send zfs_monitor data with a `health` string but no
`health_ok` numeric field (added in a recent plugin update). Without
health_ok in the data, the wildcard threshold check found nothing and
no CRITICAL alert was raised for DEGRADED/SUSPENDED pools.

Synthesize health_ok from the health string in the server's nested-
metric loop so alerts fire regardless of client version.

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

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.

README.md

@@ -27,6 +27,7 @@ A lightweight daemon that listens for UDP heartbeat messages and acts on them: k
   - Configurable retention and backup management
 - **Plugin system for extensible monitoring** ✅
   - Collect system metrics (CPU, memory, disk, network)
+  - Monitor ZFS pool health, capacity, and I/O via `zpool(8)`
   - Execute existing Nagios monitoring plugins
   - Create custom plugins with simple Python classes
 - **Threshold alerting system** ✅
@@ -34,6 +35,8 @@ A lightweight daemon that listens for UDP heartbeat messages and acts on them: k
   - Hysteresis to prevent alert flapping
   - Automatic notifications on state changes
   - Re-notification for ongoing alerts
+- **Per-host watch flag** — set `watch: false` on any host to silence all notifications for that host without removing its configuration ✅
+- **Role-filtered dashboards** — Live Dashboard and Host Overview show only hosts where the logged-in user is owner or manager (admins see all) ✅
 - Modular codebase suitable for unit testing and CI ✅
 
 ---
@@ -55,21 +58,26 @@ Heartbeat includes a comprehensive plugin architecture that extends monitoring b
 ### Built-in Plugins
 
 - `os_info`: Collects OS, kernel, distribution, and architecture information
-- `cpu_monitor`: Monitors CPU usage, load average, frequency, and process counts
-- `memory_monitor`: Monitors RAM and swap usage, available memory
+- `cpu_monitor`: Monitors CPU usage, load average, frequency, process counts, and uptime
+- `memory_monitor`: Monitors RAM and swap usage, available memory (ZFS ARC-aware)
 - `disk_monitor`: Monitors disk usage, I/O statistics, and filesystem metrics
 - `network_monitor`: Monitors network interface statistics, bandwidth, and connections
+- `ping_monitor`: Measures round-trip latency to configured hosts
 - `filesystem_info`: Collects mounted filesystem information (physical filesystems only by default)
 - `nagios_runner`: Executes Nagios monitoring plugins (check_disk, check_load, check_http, etc.)
+- `zfs_monitor`: Monitors ZFS pool health, capacity, fragmentation, dedup ratio, and cumulative I/O via `zpool(8)`
 
 ### Nagios Integration
 
 The `nagios_runner` plugin provides seamless integration with the vast Nagios plugin ecosystem. You can run any Nagios-compatible plugin and have the results automatically parsed and stored:
 
-- Executes plugins via subprocess with timeout protection
+- Executes plugins asynchronously (non-blocking) with timeout protection
+- Captures both stdout and stderr; if stdout is empty, stderr is used as the status message
+- Handles signal-killed processes (negative exit code → UNKNOWN status)
+- Validates absolute command paths at startup and warns on missing or non-executable files
 - Parses exit codes (OK/WARNING/CRITICAL/UNKNOWN)
 - Extracts performance data with thresholds
-- Reports aggregated status across all configured checks
+- Reports per-check status, exit code, and output; no aggregate rollup field
 
 See [docs/NAGIOS_INTEGRATION.md](docs/NAGIOS_INTEGRATION.md) for complete integration guide including configuration examples and custom plugin development.
 
@@ -147,9 +155,11 @@ Heartbeat includes a sophisticated threshold alerting system that monitors plugi
 - **Multi-level alerts**: WARNING and CRITICAL severity levels
 - **Flexible operators**: Support for >, >=, <, <=, ==, != comparisons
 - **Hysteresis**: Prevents alert flapping with configurable recovery thresholds
-- **Smart notifications**: Alerts only on state changes, not every check
+- **Smart notifications**: Alerts only on state changes, not every check; de-escalations (e.g. CRITICAL → WARNING) do not generate a notification
 - **Re-notifications**: Periodic reminders for ongoing alerts
+- **Short-duration suppression**: Recovery notifications are suppressed for down events under 4 seconds (avoids noise from transient blips)
 - **Journal integration**: All threshold events logged for audit trail
+- **`ping_monitor` thresholds**: Latency and packet-loss thresholds use the same format as all other plugin metrics
 
 ### Configuration
 
@@ -172,7 +182,8 @@ thresholds:
       warning: 80.0      # Warn when CPU > 80%
       critical: 90.0     # Critical when CPU > 90%
       operator: ">"
-      hysteresis: 0.1    # 10% hysteresis to prevent flapping
+      hysteresis: 0.02   # 2% hysteresis to prevent flapping
+      display: "(threshold: {op_symbol} {threshold_value}%)"  # optional
   
   memory_monitor:
     percent:
@@ -214,7 +225,7 @@ thresholds:
     <hostname>:
       warning: <milliseconds>   # Warn when RTT > this value
       critical: <milliseconds>  # Critical when RTT > this value
-      hysteresis: 0.1           # Optional: 10% hysteresis (default)
+      hysteresis: 0.02          # Optional: 2% hysteresis (default)
 ```
 
 **Example alerts:**
@@ -265,7 +276,94 @@ All plugin metrics can be thresholded:
 - **Memory**: percent, available_mb, swap_percent
 - **Disk**: Per-partition percent, free_gb, free_mb
 - **Network**: errors_total, dropped packets, connection counts
-- **Nagios**: exit_code mapping (0=OK, 1=WARNING, 2=CRITICAL)
+- **Nagios**: Any field emitted by `nagios_runner` (`<name>_status_code`, `<name>_status`, `<name>_output`, performance data fields)
+
+### Display Format Templates
+
+Each threshold entry accepts an optional `display` field — a Python format string shown in notifications and on the Alerts dashboard:
+
+```yaml
+nagios_runner:
+  status_code:
+    warning: 1
+    critical: 2
+    operator: ">="
+    display: "{check_name}: exit {value} (expected < {threshold_value})"
+```
+
+Available variables:
+
+| Variable | Description |
+|---|---|
+| `{value}` | Current metric value |
+| `{threshold_value}` | Threshold that was crossed |
+| `{op_symbol}` | Comparison operator (`>`, `<`, `>=`, …); `"nagios"` for the nagios operator |
+| `{check_name}` | Prefix stripped by generic matching (see below) |
+| `{metric_name}` | Full field name within the plugin data |
+| `{output}` | For `nagios_runner` generic matches: the matched check's status text (alias for `{check_name}_output`) |
+| `{status}` | For `nagios_runner` generic matches: the matched check's status name — OK/WARNING/CRITICAL/UNKNOWN (alias for `{check_name}_status`) |
+| any plugin field | Any other field present in the plugin's data |
+
+### Generic Threshold Matching
+
+When a metric name has no exact threshold entry, the server progressively strips leading underscore-separated segments and re-tries the lookup. This lets a single generic entry cover an entire family of metrics.
+
+The classic use case is `nagios_runner`, which names each metric after the command that produced it:
+
+```
+nagios_runner.check_disk_root_status_code    → no exact match
+nagios_runner.disk_root_status_code          → no match
+nagios_runner.root_status_code               → no match
+nagios_runner.status_code                    → matched ✓
+```
+
+Configure the generic threshold once using the `nagios` operator, which maps exit codes directly to alert severity without requiring numeric warning/critical values:
+
+```yaml
+nagios_runner:
+  status_code:
+    operator: "nagios"   # 0=OK  1=WARNING  2=CRITICAL  3=UNKNOWN
+    display: "{check_name}: {output}"
+```
+
+The stripped prefix (`check_disk_root` in the example above) is available as `{check_name}` in the display template, so you can identify which check triggered the alert without writing a separate threshold entry per command.
+
+Exact matches always take priority. A generic entry only applies when no specific one is defined.
+
+### Per-Host Threshold Profiles
+
+Named threshold configurations let different hosts use different limits. A host's `threshold_config` can be a single name or a **list** — lists are applied left-to-right so profiles compose without duplication:
+
+```yaml
+threshold_configs:
+  default:
+    thresholds:
+      cpu_monitor:
+        cpu_percent: {warning: 80, critical: 90}
+      memory_monitor:
+        memory_percent: {warning: 85, critical: 95}
+
+  tight_cpu:           # override CPU limits only
+    thresholds:
+      cpu_monitor:
+        cpu_percent: {warning: 60, critical: 75}
+
+  db_disk:             # add a database partition check
+    thresholds:
+      disk_monitor:
+        partitions:
+          /var/lib/postgresql:
+            percent: {warning: 75, critical: 88}
+
+hosts:
+  web-01:
+    threshold_config: default          # single profile
+
+  db-01:
+    threshold_config: [tight_cpu, db_disk]   # layered: CPU override + extra disk check
+```
+
+Each named config's overrides are applied in order on top of the defaults. Metrics not mentioned in a profile are inherited unchanged.
 
 See [docs/THRESHOLD_ALERTING.md](docs/THRESHOLD_ALERTING.md) for comprehensive documentation including best practices, troubleshooting, and advanced configuration.
 
@@ -328,9 +426,10 @@ Heartbeat includes a built-in HTTP/WebSocket server that provides both a REST AP
 ### Web Dashboards
 
 - **Login** (`/login`): Browser login form (shown automatically when auth is configured)
-- **Live View** (`/live`): Real-time host connectivity, latency, and messages
-- **Plugin Metrics** (`/plugins`): Browse and visualize metrics from all plugins
-- **Alerts Dashboard** (`/alerts`): Monitor active alerts with severity filtering
+- **Live View** (`/live`): Real-time host connectivity, latency, and messages; hostnames link directly to the Host Overview page
+- **Host Overview** (`/plugins/<host>`): Per-host plugin metrics with ZFS pool visualization; filtered to hosts where the logged-in user is owner or manager (admins see all)
+- **Alerts Dashboard** (`/alerts`): Monitor active alerts with severity filtering; alert count pie chart shown in the navigation bar
+- **Settings** (`/settings`): Server configuration, user management, and threshold configuration viewer
 
 ### API Endpoints
 
@@ -377,7 +476,7 @@ This project now declares its dependencies in `pyproject.toml`. Instead
 of the old `requirements.txt` flow, install the package into a virtualenv
 using `pip`:
 
-See `scripts/install.sh` for a way to install.
+See `scripts/hb_install.sh` for a way to install.
 
 Run the daemon (example):
 
@@ -408,6 +507,9 @@ hbc --boot your-server.example.com
 
 # Verbose output
 hbc -v your-server.example.com
+
+# Send 'boot' and 'shutdown' messages on start and exit 
+hbc -b your-server.example.com
 ```
 
 You can also run it via the module entrypoint:
@@ -416,12 +518,11 @@ You can also run it via the module entrypoint:
 python -m hbd.client.main your-server.example.com
 ```
 
-Client configuration can also be specified in YAML:
+Client configuration can also be specified in YAML (`~/.hbc.yaml`):
 
 ```yaml
-server: hbd.example.com
-port: 50003
-interval: 30
+hb_port: 50003        # Server port (default: 50003)
+interval: 30          # Heartbeat interval in seconds
 plugins:
   cpu_monitor:
     interval: 300      # Check every 5 minutes (default)
@@ -435,12 +536,84 @@ plugins:
   nagios_runner:
     interval: 300      # Check every 5 minutes (default)
     commands:
-      - /usr/lib/nagios/plugins/check_load -w 5,4,3 -c 10,8,6
-      - /usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /
+      - name: check_load
+        command: /usr/lib/nagios/plugins/check_load -w 5,4,3 -c 10,8,6
+      - name: check_disk
+        command: /usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /
 ```
 
+The server hostname is always passed as a positional command-line argument; there is no `server:` config key.
+
 All monitoring plugins default to 5-minute (300 second) intervals, but can be customized as needed.
 
+**Connection retry:** If a server is temporarily unreachable, `hbc` retries `open()` indefinitely on every heartbeat interval. IPv6 connections that never succeeded during early startup are dropped after 3 consecutive failures (to handle hosts without IPv6 routing), while IPv4 connections always retry.
+
+**Daemon logging:** When running with `-d`, `hbc` routes all log output to syslog (`LOG_DAEMON` facility) after daemonizing. Without `-d`, logs go to stderr as usual.
+
+### hbc_mini — single-file client (no external dependencies)
+
+`scripts/hbc_mini.py` is a self-contained version of the heartbeat client that requires only Python 3.8+ and no external packages. Copy it to any host and run it directly — no virtualenv, no `pip install`.
+
+```bash
+# Basic usage
+python3 hbc_mini.py your-server.example.com
+
+# Run as daemon
+python3 hbc_mini.py -d your-server.example.com
+
+# Send a boot message
+python3 hbc_mini.py -b your-server.example.com
+
+# Send a one-off message
+python3 hbc_mini.py -m "maintenance starting" your-server.example.com
+```
+
+**Config:** `~/.hbc.json` (same keys as `~/.hbc.yaml`, JSON format). Example:
+
+```json
+{
+  "hb_port": 50003,
+  "interval": 30,
+  "plugins": {
+    "ping_monitor": {
+      "interval": 60,
+      "hosts": ["8.8.8.8", "192.168.1.1"]
+    },
+    "nagios_runner": {
+      "interval": 300,
+      "commands": [
+        {"name": "check_load", "command": "/usr/lib/nagios/plugins/check_load -w 5,4,3 -c 10,8,6"}
+      ]
+    }
+  }
+}
+```
+
+**Plugin availability:**
+
+| Plugin | Platform | Data source |
+|---|---|---|
+| `os_info` | all | `platform` stdlib |
+| `ping_monitor` | all | `ping` subprocess |
+| `nagios_runner` | all (not Windows) | subprocess |
+| `cpu_monitor` | Linux | `/proc/stat` |
+| `memory_monitor` | Linux | `/proc/meminfo` |
+| `disk_monitor` | Linux, macOS, BSD | `df -P` subprocess |
+| `network_monitor` | Linux | `/proc/net/dev` |
+
+**What is not available compared to the full `hbc`:**
+
+- No YAML config (use JSON instead)
+- No `filesystem_info` plugin
+- No `zfs_monitor` plugin (requires `zpool(8)` and the full plugin loader)
+- `cpu_monitor` does not report per-core usage or CPU frequency (no psutil)
+- Plugins cannot be loaded from external `.py` files — all plugins are compiled in
+- No IPv6 early-fail protection — connections that fail to open at startup are silently skipped rather than retried
+
+Everything else — heartbeat protocol, ACK/CMD/UPD handling, `hb_install.sh`-based self-update, daemonize, syslog — is identical to the full client.
+
+---
+
 ## 🐞 Debugging in VS Code
 
 This repository includes a ready-to-use `.vscode/launch.json` with configurations to run or attach the VS Code debugger to `hbd`.

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`: Log file path
-- `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/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/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
@@ -814,34 +864,32 @@ 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
-- Map different hosts to different threshold sets
+- Define multiple named threshold configurations
+- 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:
@@ -849,7 +897,6 @@ threshold_configs:
           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
-host_threshold_mapping:
-  prod-web-01: high_sensitivity
-  prod-web-02: high_sensitivity
-  dev-server-01: low_sensitivity
-  # Unmapped hosts use default_threshold_config
+hosts:
+  prod-web-01:
+    threshold_config: high_sensitivity   # single config
+
+  dev-server-01:
+    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
@@ -887,11 +997,15 @@ threshold_configs:
           warning: 90.0   # More relaxed for dev
           critical: 98.0
 
-host_threshold_mapping:
-  prod-web-01: production
-  prod-web-02: production
-  dev-web-01: development
-  dev-web-02: development
+hosts:
+  prod-web-01:
+    threshold_config: production
+  prod-web-02:
+    threshold_config: production
+  dev-web-01:
+    threshold_config: development
+  dev-web-02:
+    threshold_config: development
 ```
 
 #### 2. Server Role-Based Thresholds
@@ -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:
@@ -927,17 +1041,23 @@ threshold_configs:
   cache:
     thresholds:
       memory_monitor:
-        percent:
+        memory_percent:
           warning: 95.0   # Redis/Memcached can use very high memory
           critical: 99.0
 
-host_threshold_mapping:
-  web-01: webserver
-  web-02: webserver
-  db-01: database
-  db-02: database
-  redis-01: cache
-  memcached-01: cache
+hosts:
+  web-01:
+    threshold_config: webserver
+  web-02:
+    threshold_config: webserver
+  db-01:
+    threshold_config: database
+  db-02:
+    threshold_config: database
+  redis-01:
+    threshold_config: cache
+  memcached-01:
+    threshold_config: cache
 ```
 
 #### 3. Sensitivity Levels
@@ -952,7 +1072,7 @@ threshold_configs:
         partitions:
           /:
             percent:
-              warning: 70.0    # Very sensitive
+              warning: 70.0
               critical: 80.0
               hysteresis: 0.15
 
@@ -976,52 +1096,91 @@ threshold_configs:
               critical: 98.0
               hysteresis: 0.05
 
-host_threshold_mapping:
-  payment-gateway: critical
-  auth-server: critical
-  web-01: standard
-  web-02: standard
-  test-server: relaxed
+hosts:
+  payment-gateway:
+    threshold_config: critical
+  auth-server:
+    threshold_config: critical
+  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:
-          warning: 80.0
-          critical: 90.0
-```
+        cpu_percent: {warning: 80, critical: 90}
+      memory_monitor:
+        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
-2. **Default config**: Use `default_threshold_config` 
-3. **First alphabetically**: If default not found, use first config alphabetically
-4. **Legacy fallback**: If `threshold_configs` not present, use `thresholds`
+1. **Host `threshold_config` (list)**: Layer each named config's overrides left-to-right on top of the defaults
+2. **Host `threshold_config` (string)**: Use that single named config directly
+3. **`host_threshold_mapping`** (legacy): Same as above, string only
+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:
-- 4 named configurations (default, high_sensitivity, low_sensitivity, database)
-- Host-to-config mappings for production, development, and test systems
-- Specialized database server thresholds
-- Custom display messages with plugin data
+The legacy `host_threshold_mapping` top-level key and the flat `thresholds` section are still fully supported:
+
+```yaml
+# Still works — equivalent to hosts: {prod-web-01: {threshold_config: high_sensitivity}}
+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

@@ -46,6 +46,24 @@ 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

docs/superpowers/plans/2026-04-25-plugin-error-checking.md

@@ -0,0 +1,602 @@
+# Plugin Error Checking Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Improve plugin error checking in hbc, especially for nagios_runner, and fix logger messages silently discarded in daemon mode.
+
+**Architecture:** Three focused changes across three files: (1) `hbd/client/plugin.py` gains a `skip_reason` attribute on Plugin and updated PluginLoader messaging; (2) `hbd/client/plugins/nagios_runner.py` gains async subprocess execution, stderr capture, signal-killed process handling, and init-time command path validation; (3) `hbd/client/main.py` gains proper post-fork logging reconfiguration to syslog.
+
+**Tech Stack:** Python 3.11+, asyncio, `logging.handlers.SysLogHandler`, pytest
+
+---
+
+## File Map
+
+| Action | Path | What changes |
+|---|---|---|
+| Modify | `hbd/client/plugin.py` | `Plugin.__init__` gains `skip_reason`; `PluginLoader` checks it |
+| Modify | `hbd/client/plugins/nagios_runner.py` | async subprocess, stderr, signal codes, init validation, `skip_reason` |
+| Modify | `hbd/client/main.py` | `_reconfigure_logging_for_daemon()` helper; remove redundant syslog calls |
+| Create | `tests/test_plugin.py` | PluginLoader messaging tests |
+| Create | `tests/test_nagios_runner.py` | NagiosRunnerPlugin behaviour tests |
+
+Run tests throughout with:
+```bash
+python -m pytest tests/test_plugin.py tests/test_nagios_runner.py -v
+```
+
+---
+
+## Task 1: Plugin.skip_reason + PluginLoader messaging
+
+**Files:**
+- Modify: `hbd/client/plugin.py:40-48` (Plugin.__init__)
+- Modify: `hbd/client/plugin.py:369-381` (PluginLoader.load_from_directory)
+- Create: `tests/test_plugin.py`
+
+- [ ] **Step 1: Write failing tests**
+
+Create `tests/test_plugin.py`:
+
+```python
+import asyncio
+import logging
+import textwrap
+
+from hbd.client.plugin import Plugin, 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)
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+```bash
+python -m pytest tests/test_plugin.py -v
+```
+Expected: `test_plugin_skip_reason_defaults_none` FAILS (attribute missing), others may error.
+
+- [ ] **Step 3: Add `skip_reason` to `Plugin.__init__`**
+
+In `hbd/client/plugin.py`, in `Plugin.__init__` (around line 46), add one line:
+
+```python
+def __init__(self, config: Optional[Dict[str, Any]] = None):
+    self.config = config or {}
+    self.logger = logging.getLogger(f"plugin.{self.name}")
+    self._initialized = False
+    self.skip_reason: Optional[str] = None
+```
+
+- [ ] **Step 4: Update PluginLoader messaging**
+
+In `hbd/client/plugin.py`, replace the `if not initialized:` block (around line 372):
+
+```python
+                    if not initialized:
+                        if plugin.skip_reason:
+                            self.logger.info(
+                                f"Plugin {plugin.name} skipped: {plugin.skip_reason}"
+                            )
+                        else:
+                            self.logger.warning(
+                                f"Plugin {plugin.name} failed initialization, skipping"
+                            )
+                        continue
+```
+
+- [ ] **Step 5: Run tests to verify they pass**
+
+```bash
+python -m pytest tests/test_plugin.py -v
+```
+Expected: all 3 tests PASS.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add hbd/client/plugin.py tests/test_plugin.py
+git commit -m "feat: add skip_reason to Plugin; improve PluginLoader init messaging"
+```
+
+---
+
+## Task 2: NagiosRunnerPlugin — skip_reason when no commands
+
+**Files:**
+- Modify: `hbd/client/plugins/nagios_runner.py:88-105` (initialize)
+- Modify: `tests/test_nagios_runner.py` (create)
+
+- [ ] **Step 1: Write failing test**
+
+Create `tests/test_nagios_runner.py`:
+
+```python
+import asyncio
+import logging
+import os
+import stat
+
+import pytest
+
+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
+```
+
+- [ ] **Step 2: Run test to verify it fails**
+
+```bash
+python -m pytest tests/test_nagios_runner.py::test_no_commands_sets_skip_reason -v
+```
+Expected: FAIL — `plugin.skip_reason` is `None`.
+
+- [ ] **Step 3: Set skip_reason in NagiosRunnerPlugin.initialize()**
+
+In `hbd/client/plugins/nagios_runner.py`, replace the early-return block in `initialize()` (around line 96):
+
+```python
+        if not self.commands:
+            self.skip_reason = "no commands configured (add nagios_runner.commands to config)"
+            self.logger.info("No Nagios commands configured")
+            return False
+```
+
+- [ ] **Step 4: Run test to verify it passes**
+
+```bash
+python -m pytest tests/test_nagios_runner.py::test_no_commands_sets_skip_reason -v
+```
+Expected: PASS.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add hbd/client/plugins/nagios_runner.py tests/test_nagios_runner.py
+git commit -m "feat: set skip_reason on nagios_runner when no commands configured"
+```
+
+---
+
+## Task 3: NagiosRunnerPlugin — async subprocess, stderr capture, negative return codes
+
+**Files:**
+- Modify: `hbd/client/plugins/nagios_runner.py` (imports + `_run_nagios_plugin`)
+- Modify: `tests/test_nagios_runner.py`
+
+- [ ] **Step 1: Write failing tests**
+
+Append to `tests/test_nagios_runner.py`:
+
+```python
+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()
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+```bash
+python -m pytest tests/test_nagios_runner.py::test_stderr_used_when_stdout_empty \
+    tests/test_nagios_runner.py::test_stderr_appended_when_both_present \
+    tests/test_nagios_runner.py::test_negative_returncode_maps_to_unknown -v
+```
+Expected: all FAIL — current implementation ignores stderr and doesn't handle negative codes.
+
+- [ ] **Step 3: Update imports in nagios_runner.py**
+
+Replace the import block at the top of `hbd/client/plugins/nagios_runner.py`:
+
+```python
+import asyncio
+import os
+import re
+from typing import Any, Dict, List, Optional, Tuple
+
+from hbd.client.plugin import MonitorPlugin
+```
+
+(Remove `import subprocess`; add `import asyncio` and `import os`.)
+
+- [ ] **Step 4: Upgrade collection log level from DEBUG to INFO**
+
+In `hbd/client/plugins/nagios_runner.py`, in `_collect_metrics()`, change the debug log (around line 144) so results are visible at INFO level:
+
+```python
+                self.logger.info(
+                    f"Executed {name}: {STATUS_NAMES.get(status_code, 'UNKNOWN')} - {output[:50]}"
+                )
+```
+
+- [ ] **Step 5: Replace `_run_nagios_plugin` with async implementation**
+
+Replace the entire `_run_nagios_plugin` method in `hbd/client/plugins/nagios_runner.py`:
+
+```python
+    async def _run_nagios_plugin(
+        self,
+        command: str
+    ) -> Tuple[int, str, Dict[str, Any]]:
+        """Execute a Nagios plugin and parse its output."""
+        try:
+            proc = await asyncio.create_subprocess_shell(
+                command,
+                stdout=asyncio.subprocess.PIPE,
+                stderr=asyncio.subprocess.PIPE,
+            )
+            try:
+                stdout_bytes, stderr_bytes = await asyncio.wait_for(
+                    proc.communicate(), timeout=self.timeout
+                )
+            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
+
+            stdout = stdout_bytes.decode(errors="replace").strip()
+            stderr = stderr_bytes.decode(errors="replace").strip()
+
+            # Parse perfdata from stdout before mixing in stderr
+            perfdata = self._parse_perfdata(stdout)
+
+            # 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 = status_part
+
+            return status_code, output_msg, perfdata
+
+        except Exception as e:
+            self.logger.error(f"Error executing command: {e}")
+            return NAGIOS_UNKNOWN, f"Execution error: {str(e)}", {}
+```
+
+Also remove the now-unused `self.shell` line from `__init__` (the `shell` config key is no longer used since `create_subprocess_shell` always uses a shell):
+
+In `NagiosRunnerPlugin.__init__`, remove:
+```python
+        self.shell: bool = config.get("shell", True) if config else True
+```
+
+- [ ] **Step 6: Run tests to verify they pass**
+
+```bash
+python -m pytest tests/test_nagios_runner.py -v
+```
+Expected: all tests PASS including the 3 new ones.
+
+- [ ] **Step 7: Commit**
+
+```bash
+git add hbd/client/plugins/nagios_runner.py tests/test_nagios_runner.py
+git commit -m "feat: async subprocess in nagios_runner with stderr capture and signal handling"
+```
+
+---
+
+## Task 4: NagiosRunnerPlugin — command path validation at init
+
+**Files:**
+- Modify: `hbd/client/plugins/nagios_runner.py` (initialize)
+- Modify: `tests/test_nagios_runner.py`
+
+- [ ] **Step 1: Write failing tests**
+
+Append to `tests/test_nagios_runner.py`:
+
+```python
+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
+    )
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+```bash
+python -m pytest tests/test_nagios_runner.py::test_absolute_path_not_found_warns \
+    tests/test_nagios_runner.py::test_absolute_path_not_executable_warns \
+    tests/test_nagios_runner.py::test_relative_path_not_checked -v
+```
+Expected: `test_absolute_path_not_found_warns` and `test_absolute_path_not_executable_warns` FAIL (no warnings logged); `test_relative_path_not_checked` may pass.
+
+- [ ] **Step 3: Add command path validation to `initialize()`**
+
+In `hbd/client/plugins/nagios_runner.py`, extend `initialize()` by adding validation after the existing "log each command" loop (after line 103, before `return True`):
+
+```python
+        # 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
+            exe = command.split()[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}"
+                    )
+```
+
+- [ ] **Step 4: Run full test suite to verify all pass**
+
+```bash
+python -m pytest tests/test_plugin.py tests/test_nagios_runner.py -v
+```
+Expected: all tests PASS.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add hbd/client/plugins/nagios_runner.py tests/test_nagios_runner.py
+git commit -m "feat: validate absolute command paths at nagios_runner init"
+```
+
+---
+
+## Task 5: Daemon mode logging — route to syslog after fork
+
+**Files:**
+- Modify: `hbd/client/main.py` (new helper + updated daemon block)
+
+No automated test for daemonization itself (fork behaviour is hard to unit-test). Manual verification steps are provided below.
+
+- [ ] **Step 1: Add `_reconfigure_logging_for_daemon` helper**
+
+In `hbd/client/main.py`, add this function just before `def build_parser()` (around line 589):
+
+```python
+def _reconfigure_logging_for_daemon(log_level: int) -> None:
+    """Replace StreamHandlers (now writing to /dev/null) with a SysLogHandler."""
+    from logging.handlers import SysLogHandler
+
+    root = logging.getLogger()
+    for handler in root.handlers[:]:
+        root.removeHandler(handler)
+        handler.close()
+
+    try:
+        syslog_handler = SysLogHandler(
+            address="/dev/log",
+            facility=SysLogHandler.LOG_DAEMON,
+        )
+    except OSError:
+        syslog_handler = SysLogHandler(
+            address=("localhost", 514),
+            facility=SysLogHandler.LOG_DAEMON,
+        )
+        # Attach the fallback first so the warning reaches syslog
+        syslog_handler.setFormatter(
+            logging.Formatter("hbc[%(process)d]: %(name)s %(levelname)s: %(message)s")
+        )
+        root.addHandler(syslog_handler)
+        root.setLevel(log_level)
+        logging.warning("/dev/log not found, using syslog UDP localhost:514")
+        return
+
+    syslog_handler.setFormatter(
+        logging.Formatter("hbc[%(process)d]: %(name)s %(levelname)s: %(message)s")
+    )
+    root.addHandler(syslog_handler)
+    root.setLevel(log_level)
+```
+
+- [ ] **Step 2: Update the daemon block in `main()`**
+
+In `hbd/client/main.py`, replace the entire `if args.daemon:` block (lines 664–675):
+
+```python
+    if args.daemon:
+        print("Daemonizing...")
+        daemonize()
+        _reconfigure_logging_for_daemon(log_level)
+        logging.info(f"hbc starting, sending heartbeat to {', '.join(args.hosts)}")
+```
+
+This removes the `import syslog`, `syslog.openlog()`, and `syslog.syslog()` calls (now handled by the logging system) and removes the no-op second `logging.basicConfig()` call.
+
+- [ ] **Step 3: Run existing test suite to confirm no regressions**
+
+```bash
+python -m pytest tests/test_plugin.py tests/test_nagios_runner.py -v
+```
+Expected: all tests still PASS.
+
+- [ ] **Step 4: Manual smoke test — verify syslog output in daemon mode**
+
+```bash
+# In one terminal, tail syslog
+sudo journalctl -f -t hbc
+
+# In another terminal, start hbc in daemon mode (replace HOST with a real or dummy host)
+python -m hbd.client.main -d -v localhost
+
+# Expected in journalctl output:
+#   hbc[<pid>]: hbc.main INFO: Starting hbc for <hostname> -> ['localhost']
+#   hbc[<pid>]: hbc.main INFO: hbc starting, sending heartbeat to localhost
+#   hbc[<pid>]: plugin.loader INFO: ...
+
+# Stop the daemon
+pkill -f "hbd.client.main"
+```
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add hbd/client/main.py
+git commit -m "fix: reconfigure logging to syslog after daemonize() instead of no-op basicConfig"
+```

docs/superpowers/plans/2026-05-08-gitea-oauth2.md

@@ -0,0 +1,781 @@
+# Gitea OAuth2 Authentication Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add Gitea as an OAuth2 login provider that coexists with password auth, auto-provisioning new users on first login.
+
+**Architecture:** A new `oauth.py` module owns all Gitea-specific logic (CSRF state, URL building, token exchange, user-info fetch). `users.py` gains one function to upsert an OAuth-sourced user. `http.py` gets two new route handlers and a small login-page change. No new dependencies — `aiohttp.ClientSession` is already used in the codebase.
+
+**Tech Stack:** Python 3.12, aiohttp 3.x, pytest, pytest-asyncio
+
+---
+
+## File Map
+
+| Action | Path | Responsibility |
+|--------|------|----------------|
+| Modify | `hbd/server/config.py` | Add `"oauth": {}` default |
+| Create | `hbd/server/oauth.py` | CSRF state, URL builder, token exchange, user-info fetch |
+| Modify | `hbd/server/users.py` | Add `provision_oauth_user()` |
+| Modify | `hbd/server/http.py` | Import oauth, two new routes, login page button |
+| Create | `tests/test_oauth.py` | All new unit tests |
+
+---
+
+## Task 1: Add config default and `is_enabled()`
+
+**Files:**
+- Modify: `hbd/server/config.py:34` (after the `"users"` line)
+- Create: `hbd/server/oauth.py`
+- Create: `tests/test_oauth.py`
+
+- [ ] **Step 1: Write the failing test**
+
+Create `tests/test_oauth.py`:
+
+```python
+import pytest
+from hbd.server import oauth
+
+
+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"}}}
+
+
+def test_is_enabled_when_all_keys_present():
+    assert oauth.is_enabled(CFG_ON) is True
+
+
+def test_is_enabled_false_when_no_oauth_key():
+    assert oauth.is_enabled(CFG_OFF) is False
+
+
+def test_is_enabled_false_when_partial_config():
+    assert oauth.is_enabled(CFG_PARTIAL) is False
+```
+
+- [ ] **Step 2: Run to confirm failure**
+
+```
+pytest tests/test_oauth.py -v
+```
+
+Expected: `ModuleNotFoundError: No module named 'hbd.server.oauth'`
+
+- [ ] **Step 3: Add config default**
+
+In `hbd/server/config.py`, add after the `"default_owner"` line (currently line 35):
+
+```python
+    # OAuth2 providers
+    "oauth": {},                 # oauth.gitea.{url,client_id,client_secret}
+```
+
+- [ ] **Step 4: Create `hbd/server/oauth.py` with `is_enabled`**
+
+```python
+"""Gitea OAuth2 support.
+
+Config shape (in ~/.hb.yaml):
+
+    oauth:
+      gitea:
+        url: https://git.example.com
+        client_id: <client-id>
+        client_secret: <client-secret>
+
+Register a Gitea OAuth2 application at:
+  Gitea → Settings → Applications → OAuth2
+Set the redirect URI to:
+  https://<hbd-host>/login/oauth/gitea/callback
+"""
+
+import logging
+import secrets
+import time
+
+import aiohttp
+
+logger = logging.getLogger(__name__)
+
+STATE_TTL = 600  # 10 minutes
+
+# state_token -> expiry timestamp
+_states: dict[str, float] = {}
+
+
+class OAuthError(Exception):
+    """Raised when the OAuth2 flow fails for any reason."""
+
+
+def _gitea_cfg(config: dict) -> dict:
+    """Return the gitea sub-dict or {} if absent/incomplete."""
+    return config.get("oauth", {}).get("gitea", {})
+
+
+def is_enabled(config: dict) -> bool:
+    """Return True when all three required Gitea OAuth keys are present."""
+    g = _gitea_cfg(config)
+    return bool(g.get("url") and g.get("client_id") and g.get("client_secret"))
+```
+
+- [ ] **Step 5: Run to confirm tests pass**
+
+```
+pytest tests/test_oauth.py -v
+```
+
+Expected: 3 passed
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add hbd/server/config.py hbd/server/oauth.py tests/test_oauth.py
+git commit -m "feat: add oauth module skeleton and is_enabled()"
+```
+
+---
+
+## Task 2: CSRF state management
+
+**Files:**
+- Modify: `hbd/server/oauth.py` (add `make_state`, `validate_state`)
+- Modify: `tests/test_oauth.py` (add state tests)
+
+- [ ] **Step 1: Write the failing tests**
+
+Append to `tests/test_oauth.py`:
+
+```python
+import time as time_mod
+
+
+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() - 1)
+    assert oauth.validate_state(state) is False
+```
+
+- [ ] **Step 2: Run to confirm failure**
+
+```
+pytest tests/test_oauth.py -v -k "state"
+```
+
+Expected: `AttributeError: module 'hbd.server.oauth' has no attribute 'make_state'`
+
+- [ ] **Step 3: Implement state functions**
+
+Add to `hbd/server/oauth.py` after the `_states` dict definition:
+
+```python
+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:
+    now = time.time()
+    expired = [k for k, exp in list(_states.items()) if exp < now]
+    for k in expired:
+        del _states[k]
+```
+
+- [ ] **Step 4: Run to confirm tests pass**
+
+```
+pytest tests/test_oauth.py -v
+```
+
+Expected: 8 passed
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add hbd/server/oauth.py tests/test_oauth.py
+git commit -m "feat: add OAuth2 CSRF state management"
+```
+
+---
+
+## Task 3: `provision_oauth_user` in users.py
+
+**Files:**
+- Modify: `hbd/server/users.py` (add `provision_oauth_user`)
+- Modify: `tests/test_oauth.py` (add provisioning tests)
+
+- [ ] **Step 1: Write the failing tests**
+
+Append to `tests/test_oauth.py`:
+
+```python
+from hbd.server import users as users_mod
+from hbd.server.users import User
+
+
+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"
+```
+
+- [ ] **Step 2: Run to confirm failure**
+
+```
+pytest tests/test_oauth.py -v -k "provision"
+```
+
+Expected: `AttributeError: module 'hbd.server.users' has no attribute 'provision_oauth_user'`
+
+- [ ] **Step 3: Implement `provision_oauth_user`**
+
+Add to `hbd/server/users.py` after the `authenticate()` function (after line 187):
+
+```python
+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
+```
+
+- [ ] **Step 4: Run to confirm tests pass**
+
+```
+pytest tests/test_oauth.py -v
+```
+
+Expected: 12 passed
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add hbd/server/users.py tests/test_oauth.py
+git commit -m "feat: add provision_oauth_user() to users module"
+```
+
+---
+
+## Task 4: URL builder, token exchange, and user-info fetch
+
+**Files:**
+- Modify: `hbd/server/oauth.py` (add `authorization_url`, `exchange_code`, `fetch_user`)
+- Modify: `tests/test_oauth.py` (add async tests with mocked HTTP)
+
+- [ ] **Step 1: Write the failing tests**
+
+Append to `tests/test_oauth.py`:
+
+```python
+import pytest
+from unittest.mock import AsyncMock, MagicMock, patch
+from urllib.parse import urlparse, parse_qs
+
+
+def test_authorization_url_shape():
+    state = "teststate"
+    redirect_uri = "https://hbd.example.com/login/oauth/gitea/callback"
+    url = oauth.authorization_url(CFG_ON, state, redirect_uri)
+    parsed = urlparse(url)
+    qs = parse_qs(parsed.query)
+    assert parsed.scheme == "https"
+    assert parsed.netloc == "git.example.com"
+    assert parsed.path == "/login/oauth/authorize"
+    assert qs["client_id"] == ["cid"]
+    assert qs["state"] == ["teststate"]
+    assert qs["redirect_uri"] == [redirect_uri]
+    assert qs["scope"] == ["user:email"]
+    assert qs["response_type"] == ["code"]
+
+
+@pytest.mark.asyncio
+async def test_exchange_code_returns_token():
+    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(CFG_ON, "mycode", redirect_uri)
+    assert token == "tok123"
+
+
+@pytest.mark.asyncio
+async def test_exchange_code_raises_on_error_status():
+    redirect_uri = "https://hbd.example.com/login/oauth/gitea/callback"
+    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(CFG_ON, "badcode", redirect_uri)
+
+
+@pytest.mark.asyncio
+async def test_fetch_user_returns_profile():
+    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(CFG_ON, "tok123")
+    assert profile == {
+        "login": "alice",
+        "full_name": "Alice Smith",
+        "avatar_url": "https://git.example.com/avatars/alice.png",
+    }
+```
+
+- [ ] **Step 2: Run to confirm failure**
+
+```
+pytest tests/test_oauth.py -v -k "url or exchange or fetch"
+```
+
+Expected: `AttributeError: module 'hbd.server.oauth' has no attribute 'authorization_url'`
+
+- [ ] **Step 3: Implement the three functions**
+
+Add to `hbd/server/oauth.py`:
+
+```python
+import urllib.parse
+
+
+def authorization_url(config: dict, state: str, redirect_uri: str) -> str:
+    """Return the Gitea OAuth2 authorization URL to redirect the browser to."""
+    g = _gitea_cfg(config)
+    params = urllib.parse.urlencode({
+        "client_id": g["client_id"],
+        "redirect_uri": redirect_uri,
+        "response_type": "code",
+        "scope": "user:email",
+        "state": state,
+    })
+    return f"{g['url'].rstrip('/')}/login/oauth/authorize?{params}"
+
+
+async def exchange_code(config: dict, code: str, redirect_uri: str) -> str:
+    """Exchange an authorization *code* for a Gitea access token.
+
+    Returns the access token string.  Raises OAuthError on any failure.
+    """
+    g = _gitea_cfg(config)
+    url = f"{g['url'].rstrip('/')}/login/oauth/access_token"
+    payload = {
+        "client_id": g["client_id"],
+        "client_secret": g["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(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()
+    except aiohttp.ClientError as exc:
+        raise OAuthError(f"Token exchange network error: {exc}") from exc
+    token = data.get("access_token")
+    if not token:
+        raise OAuthError(f"No access_token in response: {data}")
+    return token
+
+
+async def fetch_user(config: dict, token: str) -> dict:
+    """Fetch the authenticated user's profile from Gitea.
+
+    Returns a dict with keys: login, full_name, avatar_url.
+    Raises OAuthError on any failure.
+    """
+    g = _gitea_cfg(config)
+    url = f"{g['url'].rstrip('/')}/api/v1/user"
+    timeout = aiohttp.ClientTimeout(total=10)
+    try:
+        async with aiohttp.ClientSession(timeout=timeout) as session:
+            async with session.get(url, headers={"Authorization": f"token {token}"}) 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
+    return {
+        "login": data.get("login", ""),
+        "full_name": data.get("full_name", ""),
+        "avatar_url": data.get("avatar_url", ""),
+    }
+```
+
+Also add `import urllib.parse` at the top of `oauth.py` (alongside the existing imports).
+
+- [ ] **Step 4: Run to confirm tests pass**
+
+```
+pytest tests/test_oauth.py -v
+```
+
+Expected: 17 passed
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add hbd/server/oauth.py tests/test_oauth.py
+git commit -m "feat: add authorization_url, exchange_code, fetch_user to oauth module"
+```
+
+---
+
+## Task 5: HTTP routes — redirect and callback
+
+**Files:**
+- Modify: `hbd/server/http.py`
+
+`http.py` defines all handlers inside `async def start(...)`. The two new handlers go in the same block, just before the `app = web.Application()` line (~line 900). The import goes at the top of the file.
+
+- [ ] **Step 1: Add the import**
+
+In `hbd/server/http.py`, add after the existing local imports (after `from . import users as users_mod`):
+
+```python
+from . import oauth as oauth_mod
+```
+
+- [ ] **Step 2: Add the two route handlers**
+
+In `hbd/server/http.py`, add the two handlers immediately before the `app = web.Application()` line:
+
+```python
+    async def oauth_gitea_redirect(request):
+        """GET /login/oauth/gitea — kick off the Gitea OAuth2 flow."""
+        if not oauth_mod.is_enabled(config):
+            return web.Response(status=404, text="OAuth not configured")
+        state = oauth_mod.make_state()
+        redirect_uri = f"{request.url.origin()}/login/oauth/gitea/callback"
+        raise web.HTTPFound(oauth_mod.authorization_url(config, state, redirect_uri))
+
+    async def oauth_gitea_callback(request):
+        """GET /login/oauth/gitea/callback — handle Gitea's redirect back."""
+        if not oauth_mod.is_enabled(config):
+            return web.Response(status=404, text="OAuth not configured")
+        code = request.rel_url.query.get("code", "")
+        state = request.rel_url.query.get("state", "")
+        if not code or not state:
+            return web.Response(status=400, text="Missing code or state")
+        if not oauth_mod.validate_state(state):
+            raise web.HTTPFound("/login?error=1")
+        redirect_uri = f"{request.url.origin()}/login/oauth/gitea/callback"
+        try:
+            token = await oauth_mod.exchange_code(config, code, redirect_uri)
+            profile = await oauth_mod.fetch_user(config, token)
+        except oauth_mod.OAuthError as exc:
+            logger.warning("OAuth error: %s", exc)
+            raise web.HTTPFound("/login?error=1")
+        user = users_mod.provision_oauth_user(
+            profile["login"],
+            profile["full_name"],
+            profile["avatar_url"],
+        )
+        session_token = users_mod.create_session(user.username)
+        resp = web.HTTPFound("/")
+        resp.set_cookie(
+            SESSION_COOKIE,
+            session_token,
+            max_age=users_mod.SESSION_TTL,
+            httponly=True,
+            samesite="Lax",
+        )
+        raise resp
+```
+
+- [ ] **Step 3: Register the routes**
+
+In `hbd/server/http.py`, add to the route list after the existing auth routes (after `web.post("/api/0/auth/logout", api_logout)`):
+
+```python
+            web.get("/login/oauth/gitea",          oauth_gitea_redirect),
+            web.get("/login/oauth/gitea/callback", oauth_gitea_callback),
+```
+
+- [ ] **Step 4: Manual smoke test**
+
+Start the server locally with OAuth configured in `~/.hb.yaml`:
+
+```yaml
+oauth:
+  gitea:
+    url: https://your-gitea-instance.example.com
+    client_id: your-client-id
+    client_secret: your-client-secret
+```
+
+Visit `http://localhost:50004/login/oauth/gitea` — confirm you are redirected to Gitea's authorization page.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add hbd/server/http.py
+git commit -m "feat: add Gitea OAuth2 redirect and callback routes"
+```
+
+---
+
+## Task 6: Login page — "Sign in with Gitea" button
+
+**Files:**
+- Modify: `hbd/server/http.py` (update `login_page` handler, ~line 625)
+
+- [ ] **Step 1: Replace the login page HTML**
+
+In `hbd/server/http.py`, find the `html = f"""` block inside `login_page` and replace it with:
+
+```python
+        gitea_button = ""
+        if oauth_mod.is_enabled(config):
+            gitea_url = _gitea_cfg_url(config)
+            gitea_button = f"""
+    <div class="divider">or</div>
+    <a href="/login/oauth/gitea" class="gitea-btn">
+      Sign in with Gitea
+    </a>"""
+
+        html = f"""<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Heartbeat — Login</title>
+  <style>
+    body {{ font-family: sans-serif; background: #f5f5f5; display: flex;
+            justify-content: center; align-items: center; height: 100vh; margin: 0; }}
+    .box {{ background: #fff; padding: 2em 2.5em; border-radius: 8px;
+             box-shadow: 0 2px 12px rgba(0,0,0,.15); min-width: 300px; }}
+    h2 {{ margin: 0 0 1.2em; color: #333; font-size: 1.4em; }}
+    label {{ display: block; margin-bottom: .3em; font-size: .9em; color: #555; }}
+    input {{ width: 100%; padding: .5em .7em; border: 1px solid #ccc;
+              border-radius: 4px; font-size: 1em; box-sizing: border-box; }}
+    button {{ margin-top: 1.2em; width: 100%; padding: .6em; background: #0066cc;
+               color: #fff; border: none; border-radius: 4px; font-size: 1em; cursor: pointer; }}
+    button:hover {{ background: #0055aa; }}
+    .error {{ color: #c00; font-size: .9em; margin-bottom: .8em; }}
+    .field {{ margin-bottom: .9em; }}
+    .divider {{ text-align: center; margin: 1.2em 0 .8em; color: #999;
+                font-size: .85em; border-top: 1px solid #eee; padding-top: .8em; }}
+    .gitea-btn {{ display: block; width: 100%; padding: .6em; background: #609926;
+                  color: #fff; border-radius: 4px; font-size: 1em; text-align: center;
+                  text-decoration: none; box-sizing: border-box; }}
+    .gitea-btn:hover {{ background: #4e7d1e; }}
+  </style>
+</head>
+<body>
+  <div class="box">
+    <h2>Heartbeat</h2>
+    {'<p class="error">Invalid username, password, or OAuth error.</p>' if error else ''}
+    <form method="post">
+      <div class="field"><label>Username</label><input name="username" autofocus></div>
+      <div class="field"><label>Password</label><input name="password" type="password"></div>
+      <button type="submit">Sign in</button>
+    </form>{gitea_button}
+  </div>
+</body>
+</html>"""
+```
+
+- [ ] **Step 2: Add the `_gitea_cfg_url` helper**
+
+Add this small helper in `hbd/server/http.py` just before the `login_page` handler (around line 600) so the template can read the Gitea display URL without importing internal oauth details:
+
+```python
+def _gitea_cfg_url(config: dict) -> str:
+    return config.get("oauth", {}).get("gitea", {}).get("url", "")
+```
+
+Also update the `login_page` handler's `error` logic to show the error when the `?error=1` query param is present (set by the callback on OAuth failure):
+
+```python
+    async def login_page(request):
+        """GET /login — show login form; POST /login — process and redirect."""
+        if not users_mod.users_enabled():
+            raise web.HTTPFound("/")
+
+        error = ""
+        if request.method == "POST":
+            form = await request.post()
+            username = form.get("username", "")
+            password = form.get("password", "")
+            user = users_mod.authenticate(username, password)
+            if user:
+                token = users_mod.create_session(username)
+                redirect_to = request.rel_url.query.get("next", "/")
+                resp = web.HTTPFound(redirect_to)
+                resp.set_cookie(
+                    SESSION_COOKIE,
+                    token,
+                    max_age=users_mod.SESSION_TTL,
+                    httponly=True,
+                    samesite="Lax",
+                )
+                raise resp
+            error = "Invalid username or password."
+        elif request.rel_url.query.get("error"):
+            error = "Sign-in failed. Please try again."
+```
+
+- [ ] **Step 3: Manual verification**
+
+Start the server with OAuth configured. Visit `/login`. Confirm:
+- The "Sign in with Gitea" button appears (green, below a divider)
+- Clicking it redirects to Gitea
+- After authorising on Gitea, you are redirected back and land on `/` with a valid session cookie
+
+Without OAuth configured, confirm the button does not appear.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add hbd/server/http.py
+git commit -m "feat: add Sign in with Gitea button to login page"
+```
+
+---
+
+## Self-Review Notes
+
+- All 5 spec requirements covered: coexist ✓, auto-provision ✓, regular user ✓, any Gitea user ✓, config-driven ✓
+- `exchange_code` signature in Task 4 matches usage in Task 5 (`config, code, redirect_uri`) ✓
+- `fetch_user` returns `{login, full_name, avatar_url}` — matched in callback handler ✓
+- `validate_state` removes state on use (replay protection) ✓
+- `provision_oauth_user` skips empty strings so existing avatar/name aren't erased ✓
+- `_gitea_cfg_url` is a plain `def`, not `async` — safe to call in template prep ✓

docs/superpowers/specs/2026-04-25-plugin-error-checking-design.md

@@ -0,0 +1,92 @@
+# Plugin Error Checking & Daemon Logging — Design Spec
+
+**Date:** 2026-04-25  
+**Scope:** hbc client — daemon mode logging, nagios_runner plugin robustness, PluginLoader messaging  
+**Files affected:** `hbd/client/main.py`, `hbd/client/plugins/nagios_runner.py`, `hbd/client/plugin.py`
+
+---
+
+## 1. Daemon Mode Logging
+
+### Problem
+In `main()`, `logging.basicConfig()` is called before `daemonize()` (establishing a StreamHandler to stderr), then called again after `daemonize()`. The second call is a no-op — Python ignores `basicConfig()` when handlers are already configured. After daemonization, stderr is redirected to `/dev/null`, so all subsequent log output is silently discarded.
+
+The existing `syslog.openlog()` / `syslog.syslog()` calls (lines 666–668) write a single startup message but do not integrate with the `logging` system, so plugin and connection log messages never reach syslog.
+
+### Fix
+After `daemonize()`, explicitly reconfigure the root logger:
+
+1. Remove all existing handlers (they now write to `/dev/null`).
+2. Add `logging.handlers.SysLogHandler(address='/dev/log', facility=LOG_DAEMON)`.
+3. Set formatter: `hbc[%(process)d]: %(name)s %(levelname)s: %(message)s`
+4. Preserve the `log_level` already determined from `-v`/`-x` CLI flags.
+
+Remove the redundant `syslog.openlog()` / `syslog.syslog()` calls — the logging system handles routing.
+
+**Fallback:** If `/dev/log` does not exist (containers, some BSDs), fall back to `SysLogHandler(address=('localhost', 514))`. Log one warning (to stderr, before handlers are replaced) so the operator knows.
+
+---
+
+## 2. Nagios Runner Improvements
+
+### 2a — Async Subprocess
+`_run_nagios_plugin()` is declared `async def` but calls `subprocess.run()` synchronously, blocking the event loop for the full command duration.
+
+**Fix:** Replace with `asyncio.create_subprocess_shell()` + `await proc.communicate()`. Enforce timeout with `asyncio.wait_for(..., timeout=self.timeout)` and catch `asyncio.TimeoutError`.
+
+### 2b — Stderr Capture
+Subprocess stderr is currently discarded (`capture_output=True` only captures stdout in the sync call; stderr content is lost).
+
+**Fix:** Pass `stderr=asyncio.subprocess.PIPE` to `create_subprocess_shell`. After `communicate()`, if stdout is empty but stderr has content, use stderr as the output message. If both have content, append stderr to the output for visibility.
+
+### 2c — Negative Return Codes
+A negative `returncode` means the process was killed by a signal (SIGKILL, OOM, etc.). The current code treats these as-is, which may produce unexpected status values.
+
+**Fix:** If `returncode < 0`, map to `NAGIOS_UNKNOWN` with message `"Process killed by signal {-returncode}"`.
+
+### 2d — Command Path Validation at Init
+`initialize()` currently only checks that the commands list is non-empty.
+
+**Fix:** For each command entry during `initialize()`:
+- Warn and skip the entry if `name` or `command` is missing.
+- Extract the executable (first whitespace-delimited token of the command string).
+- If the executable is an absolute path, check `os.path.isfile()` and `os.access(..., os.X_OK)`. Log a `WARNING` if either check fails.
+- Commands with relative paths or shell builtins are not checked (they may be on PATH) — just noted.
+- Validation warns only; all original entries in `self.commands` are retained and still attempted at collection time (where the existing missing-name/command guard already skips them). The plugin initializes successfully as long as the commands list is non-empty.
+
+---
+
+## 3. PluginLoader Messaging
+
+### Problem
+When `initialize()` returns `False`, the loader always logs:
+> `WARNING: Plugin X failed initialization, skipping`
+
+This is alarming when the real reason is simply "no commands configured". There is no API to distinguish "not configured" from "genuinely broken".
+
+### Fix
+Add an optional `skip_reason` attribute to `Plugin.__init__()` (defaults to `None`).
+
+In `PluginLoader.load_from_directory()`, after `initialize()` returns `False`:
+- If `plugin.skip_reason` is set → `logger.info(f"Plugin {plugin.name} skipped: {plugin.skip_reason}")`
+- If `plugin.skip_reason` is `None` → `logger.warning(f"Plugin {plugin.name} failed initialization, skipping")` (existing behaviour)
+
+In `NagiosRunnerPlugin.initialize()`, when no commands are configured:
+```python
+self.skip_reason = "no commands configured (add nagios_runner.commands to config)"
+return False
+```
+
+Genuine failures (exceptions) continue to go through the existing `except` block in the loader, logging at `ERROR` with traceback — unchanged.
+
+---
+
+## Decisions
+
+| Topic | Decision |
+|---|---|
+| Daemon log destination | syslog only (LOG_DAEMON facility) |
+| Syslog fallback | localhost:514 UDP if `/dev/log` absent |
+| Nagios result log level | INFO for all statuses (OK/WARNING/CRITICAL/UNKNOWN) |
+| Invalid command handling at init | Warn and continue; still attempt at collection time |
+| PluginLoader API change | `skip_reason` attribute on Plugin base class, checked by loader |

docs/superpowers/specs/2026-05-08-gitea-oauth2-design.md

@@ -0,0 +1,184 @@
+# Gitea OAuth2 Authentication — Design Spec
+
+Date: 2026-05-08
+
+## Overview
+
+Add Gitea as an OAuth2 login provider alongside the existing username/password
+authentication. Any user on the configured Gitea instance can sign in; their
+local account is auto-provisioned on first login as a regular (non-admin) user.
+Password login continues to work unchanged.
+
+---
+
+## Config
+
+A new optional `oauth.gitea` block in `~/.hb.yaml`. OAuth is disabled when the
+block is absent or any of the three required keys is missing.
+
+```yaml
+oauth:
+  gitea:
+    url: https://git.example.com   # Gitea base URL, no trailing slash
+    client_id: <gitea-app-client-id>
+    client_secret: <gitea-app-client-secret>
+```
+
+**Gitea setup:** Create an OAuth2 application in Gitea under
+*Settings → Applications → OAuth2*. Set the redirect URI to
+`https://<hbd-host>/login/oauth/gitea/callback`.
+
+`config.py` default:
+
+```python
+"oauth": {},
+```
+
+---
+
+## New module: `hbd/server/oauth.py`
+
+Owns all OAuth2 logic. No new dependencies — uses `aiohttp.ClientSession`
+already present in the codebase.
+
+### CSRF state store
+
+```python
+# state -> expires (float)
+_states: dict[str, float] = {}
+STATE_TTL = 600  # 10 minutes
+```
+
+`_states` is an in-memory dict. Entries are created on redirect and deleted on
+use or expiry. A purge runs on every new state generation.
+
+### Public API
+
+| Function | Description |
+|---|---|
+| `is_enabled(config)` | Returns `True` when url, client_id, and client_secret are all set |
+| `make_state()` | Generates a random state token, stores it with TTL, returns it |
+| `validate_state(state)` | Returns `True` and removes the state if valid and unexpired |
+| `authorization_url(config, state, redirect_uri)` | Builds the Gitea `/login/oauth/authorize` redirect URL with `client_id`, `redirect_uri`, `scope=user:email`, `state` |
+| `exchange_code(config, code, redirect_uri)` async | POSTs to Gitea `/login/oauth/access_token` with code and redirect_uri, returns the access token string or raises `OAuthError` |
+| `fetch_user(config, token)` async | GETs Gitea `/api/v1/user` with Bearer token, returns `{"login", "full_name", "avatar_url"}` or raises `OAuthError` |
+
+### Error handling
+
+`OAuthError(message)` is a module-level exception. The callback route catches it
+and renders the login page with an error message — identical to an invalid
+password error in UX terms.
+
+Network timeouts use a 10-second `aiohttp` timeout. Any non-2xx response from
+Gitea raises `OAuthError`.
+
+---
+
+## Change: `hbd/server/users.py`
+
+One new function added to the public API:
+
+```python
+def provision_oauth_user(username: str, full_name: str, avatar: str) -> User:
+```
+
+- If the username does not exist in the live `users` dict, creates a `User`
+  with no `password_hash` (so password login is impossible for this account)
+  and inserts it.
+- If the username already exists (e.g. was defined in config with a password),
+  updates `full_name` and `avatar` from the OAuth profile and returns the
+  existing user unchanged in all other respects (preserving admin flag,
+  notification channels, etc.).
+- Logs a one-line INFO message on first provision.
+
+---
+
+## Changes: `hbd/server/http.py`
+
+### Two new route handlers
+
+**`GET /login/oauth/gitea`**
+
+1. Checks `oauth.is_enabled(config)` — returns 404 if not.
+2. Calls `oauth.make_state()`.
+3. Constructs `redirect_uri` as `{request.url.origin()}/login/oauth/gitea/callback` using aiohttp's `request.url.origin()`.
+4. Redirects the browser to `oauth.authorization_url(config, state, redirect_uri)`.
+
+**`GET /login/oauth/gitea/callback`**
+
+1. Reads `code` and `state` query params; returns 400 if either is missing.
+2. Calls `oauth.validate_state(state)` — redirects to `/login` with error if
+   invalid (CSRF or replay protection).
+3. Reconstructs the same `redirect_uri` as the redirect handler (required by OAuth2 spec for token exchange).
+4. Calls `await oauth.exchange_code(config, code, redirect_uri)` to get the access token.
+4. Calls `await oauth.fetch_user(config, token)` to get the Gitea user profile.
+5. Calls `users_mod.provision_oauth_user(login, full_name, avatar_url)`.
+6. Calls `users_mod.create_session(username)` to get a session token.
+7. Sets `hbd_session` cookie (same flags as password login: httponly, Lax,
+   24h TTL).
+8. Redirects to `/`.
+9. Any `OAuthError` re-renders the login page with a generic error message.
+
+### Login page change
+
+When `oauth.is_enabled(config)` is `True`, the existing login form gains a
+separator and a "Sign in with Gitea" link button pointing to
+`/login/oauth/gitea`. The password form is always rendered regardless.
+
+### Route registration
+
+```python
+web.get("/login/oauth/gitea",          oauth_redirect),
+web.get("/login/oauth/gitea/callback", oauth_callback),
+```
+
+Added alongside the existing `/login` and `/logout` routes.
+
+---
+
+## Data flow
+
+```
+Browser                    hbd                        Gitea
+  |                          |                           |
+  |-- GET /login ----------->|                           |
+  |<- login page (+ button) -|                           |
+  |                          |                           |
+  |-- GET /login/oauth/gitea>|                           |
+  |<- 302 Gitea /authorize --|                           |
+  |                          |                           |
+  |-- GET /login/oauth/authorize ----------------------->|
+  |<- 302 /login/oauth/gitea/callback?code=..&state=.. --|
+  |                          |                           |
+  |-- GET /callback -------->|                           |
+  |                          |-- POST /access_token ---->|
+  |                          |<- {access_token} ---------|
+  |                          |-- GET /api/v1/user ------>|
+  |                          |<- {login, name, avatar} --|
+  |                          | provision_oauth_user()    |
+  |                          | create_session()          |
+  |<- 302 / (set cookie) ----|                           |
+```
+
+---
+
+## Testing
+
+- `test_oauth_state`: `make_state` + `validate_state` happy path; expired state
+  returns False; replay (double-use) returns False.
+- `test_provision_oauth_user_new`: new username creates User with no password.
+- `test_provision_oauth_user_existing`: existing config user updates name/avatar,
+  preserves admin flag and notification_channels.
+- `test_oauth_callback_invalid_state`: callback with bad state redirects to login.
+- Integration: mock Gitea endpoints with `aiohttp_client` fixture; full
+  redirect → callback → session cookie flow.
+
+---
+
+## Out of scope
+
+- Restricting login to specific Gitea organisations or teams.
+- Making OAuth users admin automatically.
+- Multiple OAuth providers.
+- Token refresh (Gitea access tokens are long-lived; the hbd session TTL governs
+  re-authentication).

hbd/Plan.md

@@ -1,21 +0,0 @@
-Plan the following changes, ask questions to clarify before implementing
-
-Re-factor the notification system:
-- use available libraries for pushover, matrix, email and sms notifications.
-- notifications have a title/subject:  alert_type (recover/warning/critical), a body (info from threshold check) and a link to the host plugin metrix page
-- define a list of notification channels for each user
-- notifications are dispatched to users that are listed as managers for the host
-
-
-
-1 - correct
-2 - for now channels are defined globaly 
-3 - matrix-nio)sounds good, homeserver URL, access token, room ID per channel?
-4 - use the REST api provided by https://voip.ms/api/v1/rest.php
-5 - The page does not exist yet, point at the host tab in the /plugins
-6 - per-channel minimum severity is a good idea, go fo it
-7 - yes
-
-1 - use base_url, there might not have been any incoming requests yet
-2 - use same asyncio loop for matrix-nio
-3 - for now, just silently do nothing

hbd/__init__.py

@@ -14,4 +14,4 @@ Install options:
 """
 
 __all__ = ["__version__"]
-__version__ = "5.1.2"
+__version__ = "5.2.5"

hbd/client/config.py

@@ -16,6 +16,9 @@ CLIENT_DEFAULTS = {
     "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,

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
@@ -55,6 +56,10 @@ 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}")
 
@@ -72,6 +77,7 @@ class AsyncConnection:
                 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:
@@ -92,6 +98,9 @@ class AsyncConnection:
             msg: Message dictionary
             msg_id: Message ID (HTB, PLG, etc.)
         """
+        if self._dead:
+            return
+
         if not self.transport:
             await self.open()
 
@@ -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."""
-        self.logger.error(f"Protocol error: {exc}")
+        """Handle protocol errors — close transport so the heartbeat sender retries."""
+        self.logger.warning(f"Protocol error on {self.connection.addr}: {exc} — will retry")
+        self.connection.close()
 
 
 async def handle_command(conn: AsyncConnection, msg: dict):
@@ -203,48 +216,45 @@ async def handle_command(conn: AsyncConnection, msg: dict):
     await conn.sendto(response)
 
 
-async def handle_update(conn: AsyncConnection, msg: dict):
-    """Handle self-update from server."""
-    import codecs
+async def handle_update(conn: AsyncConnection, _msg: dict):  # pyright: ignore[reportUnusedParameter]
+    """Handle self-update by running hb_install.sh."""
     import shutil
 
     logger = logging.getLogger("hbc.update")
 
-    try:
-        code = codecs.decode(msg["code"], "base64").decode()
-        csum = msg["csum"]
-    except Exception as e:
-        error = f"Missing code/csum: {e}"
+    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
 
-    # Verify checksum
-    m = md5()
-    m.update(code.encode())
-    if m.hexdigest() != csum:
-        error = "Checksum mismatch"
+    logger.info(f"Running installer: {installer}")
+    try:
+        proc = await asyncio.create_subprocess_exec(
+            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"Installer failed: {e}"
         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}"
+    if proc.returncode != 0:
+        error = f"Installer exited {proc.returncode}: {out.decode().strip()}"
         logger.error(error)
         await conn.sendto({"service": "update", "msg": error})
         return
@@ -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 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
 
-    while running:
         try:
             msg = {
                 "acks": conn.ackcount,
@@ -276,19 +322,16 @@ async def heartbeat_sender(conn: AsyncConnection, interval: int):
             }
             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(
-                    shutdown_event.wait(), 
-                    timeout=interval
-                )
+                await asyncio.wait_for(shutdown_event.wait(), timeout=interval)
                 break
             else:
                 await asyncio.sleep(interval)
@@ -299,6 +342,26 @@ 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.
 
@@ -330,24 +393,21 @@ async def plugin_collector(conn: AsyncConnection, registry: PluginRegistry):
     for plugin in monitor_plugins:
         by_interval[plugin.interval].append(plugin)
 
-    # Create tasks for each interval
-    tasks = []
+    # Create tasks for each interval; always include the info-refresh watcher
+    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)
+        ))
 
-    # Wait for all tasks
-    if tasks:
-        try:
-            await asyncio.gather(*tasks, return_exceptions=True)
-        except asyncio.CancelledError:
-            logger.debug("Plugin collector cancelled, cancelling sub-tasks")
-            for task in tasks:
-                if not task.done():
-                    task.cancel()
-            raise
+    try:
+        await asyncio.gather(*tasks, return_exceptions=True)
+    except asyncio.CancelledError:
+        logger.debug("Plugin collector cancelled, cancelling sub-tasks")
+        for task in tasks:
+            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 = {
-                "shutdown": 1,
-                "acks": conn.ackcount
-            }
-            await conn.sendto(msg)
+            await target.sendto({"shutdown": 1, "acks": target.ackcount})
         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()
@@ -459,8 +516,7 @@ 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"Port: {hb_port}, Interval: {interval}s")
+    logger.info(f"hbc {__version__} on {iam} -> {hb_hosts} port={hb_port}, interval={interval}s")
     
     # Create connections
     connections = []
@@ -478,28 +534,32 @@ async def async_main(args, config):
             addr = addr_info[4][0]
 
             conn = AsyncConnection(conn_id, addr, hb_port, af, iam)
-            if await conn.open():
-                connections.append(conn)
-                conn_id += 1
+            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:
-        logger.error("No connections established")
+        logger.error("No connections established (DNS resolution failed for all hosts)")
         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:
-            await conn.sendto(boot_msg)
+        target = next((c for c in connections if c.transport), connections[0])
+        await target.sendto(boot_msg)
         
         if args.message and not args.daemon:
             # Message-only mode
@@ -522,6 +582,13 @@ async def async_main(args, config):
     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)
     for conn in connections:
@@ -586,6 +653,36 @@ 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(
@@ -662,17 +759,10 @@ def main(argv=None):
     
     # Daemonize if requested
     if args.daemon:
-        print("Daemonizing...")
-        import syslog
-        syslog.openlog("hbc", syslog.LOG_PID, syslog.LOG_DAEMON)
-        syslog.syslog(syslog.LOG_INFO, f"Starting heartbeat to {', '.join(args.hosts)}")
+        logging.info("Daemonizing...")
         daemonize()
-        
-        # Reconfigure logging for syslog
-        logging.basicConfig(
-            level=log_level,
-            format="hbc[%(process)d]: %(name)s %(levelname)s: %(message)s"
-        )
+        _reconfigure_logging_for_daemon(log_level)
+        logging.info(f"hbc starting, sending heartbeat to {', '.join(args.hosts)}")
     
     # Run async main
     try:

hbd/client/plugin.py

@@ -29,6 +29,7 @@ class Plugin(ABC):
         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 = ""
@@ -46,6 +47,7 @@ class Plugin(ABC):
         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:
@@ -362,16 +364,24 @@ class PluginLoader:
                     
                     # Instantiate plugin with config — check plugins subdict first,
                     # then top-level keys (e.g. nagios_runner: ... at root of config).
-                    plugin_instance_config = plugins_subconfig.get(obj.name) or raw_config.get(obj.name, {})
+                    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(
-                                f"Plugin {plugin.name} failed initialization, skipping"
-                            )
+                            if plugin.skip_reason:
+                                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

@@ -119,6 +119,13 @@ class CPUMonitorPlugin(MonitorPlugin):
             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/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_used'] = vmem.used
+        metrics['memory_available'] = available
+        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",
-    NAGIOS_WARNING: "WARNING",
-    NAGIOS_CRITICAL: "CRITICAL",
-    NAGIOS_UNKNOWN: "UNKNOWN"
+    0: "OK",
+    1: "WARNING",
+    2: "CRITICAL",
+    3: "UNKNOWN",
 }
 
 
@@ -52,7 +51,6 @@ 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:
@@ -76,15 +74,8 @@ 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.info(
-                "No Nagios commands configured. Add 'nagios_runner.commands' to config."
-            )
-    
     async def initialize(self) -> bool:
         """Initialize the Nagios runner plugin.
 
@@ -94,7 +85,7 @@ class NagiosRunnerPlugin(MonitorPlugin):
         self.logger.info(f"Initializing {self.name} plugin")
 
         if not self.commands:
-            self.logger.info("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)")
@@ -102,6 +93,29 @@ class NagiosRunnerPlugin(MonitorPlugin):
             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]:
@@ -112,9 +126,6 @@ class NagiosRunnerPlugin(MonitorPlugin):
         """
         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")
@@ -132,16 +143,12 @@ class NagiosRunnerPlugin(MonitorPlugin):
                 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]}"
                 )
 
@@ -150,12 +157,6 @@ class NagiosRunnerPlugin(MonitorPlugin):
                 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
     
@@ -163,46 +164,49 @@ class NagiosRunnerPlugin(MonitorPlugin):
         self,
         command: str
     ) -> Tuple[int, str, Dict[str, Any]]:
-        """Execute a Nagios plugin and parse its output.
-        
-        Args:
-            command: Command string to execute
-            
-        Returns:
-            Tuple of (status_code, output_message, performance_data_dict)
-        """
+        """Execute a Nagios plugin and parse its output."""
         try:
-            # Run command
-            result = subprocess.run(
+            proc = await asyncio.create_subprocess_shell(
                 command,
-                shell=self.shell,
-                capture_output=True,
-                timeout=self.timeout,
-                text=True
+                stdout=asyncio.subprocess.PIPE,
+                stderr=asyncio.subprocess.PIPE,
             )
+            try:
+                stdout_bytes, stderr_bytes = await asyncio.wait_for(
+                    proc.communicate(), timeout=self.timeout
+                )
+            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 = result.returncode
-            output = result.stdout.strip()
+            status_code = proc.returncode
+
+            if status_code < 0:
+                return NAGIOS_UNKNOWN, f"Process killed by signal {-status_code}", {}
 
-            # Nagios plugins can return codes > 3, treat as UNKNOWN
             if status_code > 3:
                 status_code = NAGIOS_UNKNOWN
 
-            # Parse performance data
-            perfdata = self._parse_perfdata(output)
+            stdout = stdout_bytes.decode(errors="replace").strip()
+            stderr = stderr_bytes.decode(errors="replace").strip()
 
-            # Extract just the status message (before the pipe if present)
-            if '|' in output:
-                output_msg = output.split('|')[0].strip()
+            # Parse perfdata from stdout before mixing in stderr
+            perfdata = self._parse_perfdata(stdout)
+
+            # 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

@@ -60,7 +60,11 @@ class OSInfoPlugin(InfoPlugin):
                 "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

@@ -13,12 +13,8 @@ plugins:
     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:
-        warning: 20.0     # ms
-        critical: 100.0   # ms
-      192.168.1.1:
-        warning: 5.0
-        critical: 20.0
+      - 8.8.8.8
+      - 192.168.1.1
 ```
 
 Reported metrics per host (metric key uses the hostname with dots/colons replaced

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/config_thresholds_example.yaml

@@ -134,6 +134,30 @@ 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 critical
+          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/cli.py

@@ -144,17 +144,16 @@ def cmd_notify(args):
         url=f"{base_url}/plugins" if base_url else "",
     )
 
-    # Bypass min_level for explicit test sends; run async channels directly
     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 in ("matrix", "sms_voipms"):
-        from .notify import _send_matrix_async, _send_sms_voipms_async
-        driver_async = _send_matrix_async if ch_type == "matrix" else _send_sms_voipms_async
-        ok = asyncio.run(driver_async(channel_cfg, notif))
+    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:
-        from .notify import _DRIVERS
         driver = _DRIVERS.get(ch_type)
         if driver is None:
             print(f"Error: unknown channel type '{ch_type}'", file=sys.stderr)

hbd/server/config.py

@@ -34,6 +34,9 @@ SERVER_DEFAULTS = {
     "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": {},                # Unified host definitions
     "dyndnshosts": [],          # Hosts with dynamic DNS (legacy)
@@ -95,7 +98,26 @@ THRESHOLD_DEFAULTS = {
                 '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,
+                            'display': 'ZFS pool {pool_name} is {health}'
+                        }
+                    }
+                }
+            },
         }
     }
 
@@ -225,7 +247,7 @@ def get_watchhosts(config):
     hosts_config = config.get("hosts", {})
     if isinstance(hosts_config, dict):
         for host_name, host_attrs in hosts_config.items():
-            if isinstance(host_attrs, dict) and host_attrs.get("watch", False):
+            if isinstance(host_attrs, dict) and host_attrs.get("watch", True):
                 watchhosts.append(host_name)
     return watchhosts
 
@@ -303,7 +325,7 @@ def get_host_access(config, hostname) -> dict:
     """
     host_cfg = get_host_config(config, hostname)
 
-    owner = host_cfg.get("owner") or get_default_owner(config)
+    owner = host_cfg.get("owner") # or get_default_owner(config)
 
     managers = host_cfg.get("managers", [])
     if isinstance(managers, str):

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:
@@ -286,7 +286,7 @@ class Host:
             Host.hosts[name] = self
         self.num = num
         self.dyn = False
-        self.watched = False
+        self.watched = True
         self.upcount = 0
         self.interval = 0
         self.doesack = -1
@@ -304,6 +304,7 @@ class Host:
 
     def statedict(self):
         d = {}
+        d["raw_name"] = self.name
         d["name"] = self.name
         if self.dyn:
             d["name"] += "*"

hbd/server/http.py

@@ -1,7 +1,11 @@
 """HTTP server implementation using aiohttp and jinja2."""
 
 import asyncio
+import datetime
 import json
+import platform
+import socket
+import sys
 import time
 import urllib.parse
 import os
@@ -12,6 +16,7 @@ from . import data
 from . import notify as notify_mod
 from . import settings as settings_mod
 from . import users as users_mod
+from . import oauth as oauth_mod
 from . import ws as ws_mod
 
 logger = logging.getLogger(__name__)
@@ -111,6 +116,7 @@ async def start(
     This function is intended to be awaited inside the main asyncio event loop.
     """
     get_now = get_now or (lambda: time.time())
+    _start_epoch = time.time()
 
     async def old_index(request):
         _require_auth_redirect(request)
@@ -149,6 +155,25 @@ async def start(
         lst = [h.jsons() for h in hosts]
         return web.json_response(json.loads("[" + ",".join(lst) + "]"))
 
+    async def api_alert_summary(request):
+        """GET /api/0/alert_summary — counts of ok/warning/critical hosts visible to caller."""
+        user, err = _require_auth(request)
+        if err:
+            return err
+        from .threshold import AlertLevel
+        critical = warning = ok = 0
+        for host in hbdclass.Host.hosts.values():
+            if not _can_operate_host(user, host):
+                continue
+            levels = {s.level for s in host.alert_states.values()}
+            if AlertLevel.CRITICAL in levels:
+                critical += 1
+            elif AlertLevel.WARNING in levels:
+                warning += 1
+            else:
+                ok += 1
+        return web.json_response({"critical": critical, "warning": warning, "ok": ok})
+
     async def api_messages(request):
         lst = data.msgs[-30:]
         return web.json_response(lst)
@@ -210,15 +235,11 @@ async def start(
             return err
         qa = request.rel_url.query
         uname = urllib.parse.unquote(qa.get("h", ""))
-        ucode = qa.get("c")
-        if not ucode or not uname:
-            return web.Response(status=400, text="need h= and c= arguments")
+        if not uname:
+            return web.Response(status=400, text="need h= argument")
         if uname != "All" and uname not in hbdclass.Host.hosts:
             return web.Response(status=400, text=f"h={uname} not found")
-        if uname != "All":
-            names = [uname]
-        else:
-            names = [n for n in hbdclass.Host.hosts]
+        names = [uname] if uname != "All" else list(hbdclass.Host.hosts)
         out = []
         for n in names:
             host = hbdclass.Host.hosts[n]
@@ -227,8 +248,7 @@ async def start(
                 continue
             op_err = None
             try:
-                r = {"csum": None, "code": ucode}
-                host.cmds.append(("UPD", r))
+                host.cmds.append(("UPD", {}))
             except Exception as e:
                 op_err = str(e)
             out.append(f"update started for {n}: {op_err if op_err else 'OK'}")
@@ -258,7 +278,9 @@ async def start(
             extra_scripts=extra_scripts,
             hbd_version=hbd_version,
             hosts=[
-                hbdclass.Host.hosts[h].stateinfo() for h in sorted(hbdclass.Host.hosts)
+                hbdclass.Host.hosts[h].stateinfo()
+                for h in sorted(hbdclass.Host.hosts)
+                if _can_operate_host(current_user, hbdclass.Host.hosts[h])
             ],
             messages=data.msgs[-30:],
             current_user=current_user.to_dict() if current_user else None,
@@ -510,18 +532,20 @@ async def start(
         hosts_with_plugins = []
         for hostname in sorted(hbdclass.Host.hosts.keys()):
             host = hbdclass.Host.hosts[hostname]
-            if not _can_view_host(current_user, host):
+            if not _can_operate_host(current_user, host):
                 continue
             if host.plugin_data:
                 hosts_with_plugins.append({
                     "name": hostname,
                     "plugins": list(host.plugin_data.keys()),
+                    "is_owner": _can_own_host(current_user, host),
+                    "owner": host.owner,
                 })
 
         tmpl = env.get_template("plugins.html")
         body = tmpl.render(
-            title="Plugin Metrics - Heartbeat",
-            header="Plugin Metrics",
+            title="Host Overview - Heartbeat",
+            header="Host Overview",
             hosts=hosts_with_plugins,
             current_user=current_user.to_dict() if current_user else None,
             active_page="plugins",
@@ -598,6 +622,16 @@ async def start(
                 )
                 raise resp
             error = "Invalid username or password."
+        elif request.rel_url.query.get("error"):
+            error = "Sign-in failed. Please try again."
+
+        gitea_button = ""
+        if oauth_mod.is_enabled(config):
+            gitea_button = f"""
+    <div class="divider">or</div>
+    <a href="/login/oauth/gitea" class="gitea-btn">
+      Sign in with Gitea
+    </a>"""
 
         html = f"""<!DOCTYPE html>
 <html>
@@ -618,6 +652,12 @@ async def start(
     button:hover {{ background: #0055aa; }}
     .error {{ color: #c00; font-size: .9em; margin-bottom: .8em; }}
     .field {{ margin-bottom: .9em; }}
+    .divider {{ text-align: center; margin: 1.2em 0 .8em; color: #999;
+                font-size: .85em; border-top: 1px solid #eee; padding-top: .8em; }}
+    .gitea-btn {{ display: block; width: 100%; padding: .6em; background: #609926;
+                  color: #fff; border-radius: 4px; font-size: 1em; text-align: center;
+                  text-decoration: none; box-sizing: border-box; }}
+    .gitea-btn:hover {{ background: #4e7d1e; }}
   </style>
 </head>
 <body>
@@ -628,7 +668,7 @@ async def start(
       <div class="field"><label>Username</label><input name="username" autofocus></div>
       <div class="field"><label>Password</label><input name="password" type="password"></div>
       <button type="submit">Sign in</button>
-    </form>
+    </form>{gitea_button}
   </div>
 </body>
 </html>"""
@@ -811,6 +851,48 @@ async def start(
         )
         return web.Response(text=body, content_type="text/html")
 
+    # -------------------------------------------------------------------------
+    # About page
+    # -------------------------------------------------------------------------
+
+    async def about_page(request):
+        """GET /about — version, runtime, and project information."""
+        current_user, _ = _require_auth_redirect(request)
+        pkg_dir = os.path.dirname(__file__)
+        templates_dir = config.get("templates_dir", os.path.join(pkg_dir, "templates"))
+        env = jinja2.Environment(loader=jinja2.FileSystemLoader(templates_dir))
+        from hbd import __version__ as hbd_version
+
+        uptime_secs = int(time.time() - _start_epoch)
+        days, rem = divmod(uptime_secs, 86400)
+        hours, rem = divmod(rem, 3600)
+        mins, secs = divmod(rem, 60)
+        if days:
+            uptime_str = f"{days}d {hours}h {mins}m"
+        elif hours:
+            uptime_str = f"{hours}h {mins}m {secs}s"
+        else:
+            uptime_str = f"{mins}m {secs}s"
+
+        start_dt = datetime.datetime.fromtimestamp(_start_epoch)
+        start_time_str = start_dt.strftime("%Y-%m-%d %H:%M:%S")
+
+        tmpl = env.get_template("about.html")
+        body = tmpl.render(
+            title="About - Heartbeat",
+            header="About",
+            hbd_version=hbd_version,
+            python_version=f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro} ({platform.python_implementation()})",
+            server_hostname=socket.gethostname(),
+            start_epoch=int(_start_epoch),
+            start_time_str=start_time_str,
+            uptime_str=uptime_str,
+            host_count=len(hbdclass.Host.hosts),
+            current_user=current_user.to_dict() if current_user else None,
+            active_page="about",
+        )
+        return web.Response(text=body, content_type="text/html")
+
     # -------------------------------------------------------------------------
     # Settings page (admin only)
     # -------------------------------------------------------------------------
@@ -826,12 +908,56 @@ async def start(
         tmpl = env.get_template("settings.html")
         body = tmpl.render(
             title="Settings - Heartbeat",
-            sections=settings_mod.get_settings_sections(config),
+            sections=settings_mod.get_settings_sections(config, threshold_checker=threshold_checker),
             current_user=current_user.to_dict() if current_user else None,
             active_page="settings",
         )
         return web.Response(text=body, content_type="text/html")
 
+    def _oauth_redirect_uri(request) -> str:
+        base = config.get("base_url", "").rstrip("/") or str(request.url.origin())
+        return f"{base}/login/oauth/gitea/callback"
+
+    async def oauth_gitea_redirect(request):
+        """GET /login/oauth/gitea — kick off the Gitea OAuth2 flow."""
+        if not oauth_mod.is_enabled(config):
+            return web.Response(status=404, text="OAuth not configured")
+        state = oauth_mod.make_state()
+        raise web.HTTPFound(oauth_mod.authorization_url(config, state, _oauth_redirect_uri(request)))
+
+    async def oauth_gitea_callback(request):
+        """GET /login/oauth/gitea/callback — handle Gitea's redirect back."""
+        if not oauth_mod.is_enabled(config):
+            return web.Response(status=404, text="OAuth not configured")
+        code = request.rel_url.query.get("code", "")
+        state = request.rel_url.query.get("state", "")
+        if not code or not state:
+            return web.Response(status=400, text="Missing code or state")
+        if not oauth_mod.validate_state(state):
+            logger.warning("OAuth: invalid or expired state token from %s", request.remote)
+            raise web.HTTPFound("/login?error=1")
+        try:
+            token = await oauth_mod.exchange_code(config, code, _oauth_redirect_uri(request))
+            profile = await oauth_mod.fetch_user(config, token)
+        except oauth_mod.OAuthError as exc:
+            logger.warning("OAuth error: %s", exc)
+            raise web.HTTPFound("/login?error=1")
+        user = users_mod.provision_oauth_user(
+            profile["login"],
+            profile["full_name"],
+            profile["avatar_url"],
+        )
+        session_token = users_mod.create_session(user.username)
+        resp = web.HTTPFound("/")
+        resp.set_cookie(
+            SESSION_COOKIE,
+            session_token,
+            max_age=users_mod.SESSION_TTL,
+            httponly=True,
+            samesite="Lax",
+        )
+        raise resp
+
     app = web.Application()
     app.add_routes(
         [
@@ -843,12 +969,15 @@ async def start(
             web.get("/logout", web_logout),
             web.post("/api/0/auth/login", api_login),
             web.post("/api/0/auth/logout", api_logout),
+            web.get("/login/oauth/gitea",          oauth_gitea_redirect),
+            web.get("/login/oauth/gitea/callback", oauth_gitea_callback),
             # Users
             web.get("/api/0/users", api_users),
             web.get("/api/0/users/me", api_user_self),
             web.get("/api/0/users/{username}/avatar", api_user_avatar),
             # Hosts
             web.get("/api/0/hosts", api_hosts),
+            web.get("/api/0/alert_summary", api_alert_summary),
             web.get("/api/0/messages", api_messages),
             web.get("/api/0/hosts/{hostname}/plugins", api_host_plugins),
             web.get("/api/0/hosts/{hostname}/plugins/{plugin_name}", api_host_plugin_detail),
@@ -864,6 +993,7 @@ async def start(
             web.get("/live", live),
             web.get("/plugins", plugins_page),
             web.get("/alerts", alerts_page),
+            web.get("/about", about_page),
             web.get("/profile", profile_page),
             web.get("/settings", settings_page),
             web.get("/static/{path:.*}", static),

hbd/server/main.py

@@ -101,9 +101,10 @@ async def reload_configuration(config_obj, config_path, components):
             access = config_mod.get_host_access(new_config, hostname)
             host.apply_access(access["owner"], access["managers"], access["monitors"])
 
-        # Reload threshold checker
+        # 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)
@@ -210,7 +211,6 @@ async def _run_async(config, config_path=None):
         ctx = dict(
             config=config,
             hbdclass=hbdclass,
-            log=eventlog,
             msg_to_websockets=msg_to_websockets,
             msg_journal=msg_journal,
             threshold_checker=threshold_checker,
@@ -237,12 +237,15 @@ async def _run_async(config, config_path=None):
     restore_ctx = dict(
         config=config,
         hbdclass=hbdclass,
-        log=eventlog,
         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)
+
     # HTTP server (asyncio-based via aiohttp)
     try:
         http_task = asyncio.create_task(
@@ -252,6 +255,7 @@ 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="",
@@ -471,6 +475,8 @@ def run(config, config_path=None):
     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"))

hbd/server/notify.py

@@ -15,7 +15,6 @@ their own ``notification_channels`` list.  When no users are configured the
 server runs silently (no notifications sent).
 """
 
-import asyncio
 import asyncio
 import logging
 import smtplib
@@ -30,13 +29,10 @@ from . import ws as ws_mod
 
 logger = logging.getLogger(__name__)
 
-logger = logging.getLogger(__name__)
-
 msg_to_websockets = ws_mod.broadcast
 
 # Module-level state set via setup()
 _config: dict = {}
-_loop: Optional[asyncio.AbstractEventLoop] = None
 
 # Tracks which channels fired a WARNING/CRITICAL per host.
 # {host_name: set of channel_names}  — used to route RECOVER to the same channels.
@@ -73,11 +69,9 @@ class Notification:
 # ---------------------------------------------------------------------------
 
 def setup(cfg: dict, loop: Optional[asyncio.AbstractEventLoop] = None):
-    """Initialize notifier from configuration dict and event loop."""
-    global _config, _loop
+    """Initialize notifier from configuration dict."""
+    global _config
     _config = dict(cfg)
-    if loop is not None:
-        _loop = loop
 
 
 def reload_config(cfg: dict):
@@ -112,11 +106,18 @@ def closelog():
 
 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:
@@ -124,7 +125,7 @@ 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)
 
 
 # ---------------------------------------------------------------------------
@@ -140,9 +141,11 @@ def _send_pushover(channel_cfg: dict, notif: Notification) -> bool:
         logger.warning("pushover: missing token or user")
         return False
     params: dict = {"token": token, "user": user, "title": notif.title, "message": notif.body}
+    if channel_cfg.get("sound"):
+        params["sound"] = channel_cfg["sound"]
     if notif.url:
         params["url"] = notif.url
-        params["url_title"] = "Plugin metrics"
+        params["url_title"] = "Heartbeat"
     conn = http.client.HTTPSConnection("api.pushover.net:443")
     try:
         conn.request(
@@ -215,7 +218,7 @@ def _send_mattermost(channel_cfg: dict, notif: Notification) -> bool:
         return False
     text = f"**{notif.title}**\n{notif.body}"
     if notif.url:
-        text += f"\n[Plugin metrics]({notif.url})"
+        text += f"\n[Plugin metrics] {notif.url}"
     ses = {"url": host, "scheme": "http", "basepath": "/api/v4", "port": 8065}
     mm = Driver(ses)
     payload: dict = {"text": text, "channel": channel, "username": channel_cfg.get("username", "hbd")}
@@ -299,17 +302,6 @@ async def _send_sms_voipms_async(channel_cfg: dict, notif: Notification) -> bool
         return False
 
 
-def _send_sms_voipms(channel_cfg: dict, notif: Notification) -> bool:
-    """Dispatch voip.ms SMS send onto the shared event loop."""
-    if _loop is None:
-        logger.warning("sms_voipms: event loop not available")
-        return False
-    future = asyncio.run_coroutine_threadsafe(_send_sms_voipms_async(channel_cfg, notif), _loop)
-    try:
-        return future.result(timeout=15)
-    except Exception as e:
-        logger.error("sms_voipms send timed out or failed: %s", e)
-        return False
 
 
 async def _send_matrix_async(channel_cfg: dict, notif: Notification) -> bool:
@@ -357,40 +349,23 @@ async def _send_matrix_async(channel_cfg: dict, notif: Notification) -> bool:
         await client.close()
 
 
-def _send_matrix(channel_cfg: dict, notif: Notification) -> bool:
-    """Dispatch matrix send onto the shared event loop."""
-    if _loop is None:
-        logger.warning("matrix: event loop not available")
-        return False
-    future = asyncio.run_coroutine_threadsafe(_send_matrix_async(channel_cfg, notif), _loop)
-    try:
-        return future.result(timeout=15)
-    except Exception as e:
-        logger.error("matrix send timed out or failed: %s", e)
-        return False
-
-
 # ---------------------------------------------------------------------------
-# Channel dispatcher
+# 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,
-    "sms_voipms": _send_sms_voipms,
-    "matrix": _send_matrix,
 }
 
+_TIMEOUT = 15  # seconds per channel send
 
-def _dispatch_to_channel(channel_name: str, channel_cfg: dict, notif: Notification) -> bool:
-    """Send *notif* to a single named channel, honouring min_level.
 
-    RECOVER always bypasses min_level — a recovery is always relevant if the
-    channel was configured for any alerting (handles the restart-then-recover case
-    where _alerted_channels is empty and we fall through to the normal loop).
-    """
+async def _dispatch_to_channel(channel_name: str, channel_cfg: dict, notif: Notification) -> bool:
+    """Send *notif* to a single named channel, honouring min_level."""
     level = notif.level.upper()
     if level != "RECOVER":
         min_level = channel_cfg.get("min_level", "WARNING").upper()
@@ -398,14 +373,24 @@ def _dispatch_to_channel(channel_name: str, channel_cfg: dict, notif: Notificati
             logger.debug(
                 "channel '%s': skipping level %s (min_level=%s)", channel_name, level, min_level
             )
-            return True  # not an error — filtered intentionally
+            return True  # filtered intentionally
 
     ch_type = channel_cfg.get("type", "")
-    driver = _DRIVERS.get(ch_type)
-    if driver is None:
-        logger.warning("unknown channel type '%s' for channel '%s'", ch_type, channel_name)
+    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
-    return driver(channel_cfg, notif)
 
 
 # ---------------------------------------------------------------------------
@@ -419,7 +404,7 @@ def _build_url(host_name: str) -> str:
     return f"{base_url}/plugins#{host_name}"
 
 
-def send_notification(host_name: str, notif: Notification) -> dict:
+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
@@ -469,16 +454,12 @@ def send_notification(host_name: str, notif: Notification) -> dict:
             if not channel_cfg:
                 continue
             try:
-                ch_type = channel_cfg.get("type", "")
-                driver = _DRIVERS.get(ch_type)
-                if driver:
-                    ok = driver(channel_cfg, notif)
-                    results[channel_name] = ok
-                    if ok:
-                        logger.info("recover sent to channel '%s': %s", channel_name, notif.title)
+                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)
-        # Clear the alerted set once recovery is delivered
         del _alerted_channels[host_name]
         return results
 
@@ -489,14 +470,14 @@ def send_notification(host_name: str, notif: Notification) -> dict:
             continue
         for channel_name in user.notification_channels:
             if channel_name in results:
-                continue  # already dispatched to this channel this notification
+                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 = _dispatch_to_channel(channel_name, channel_cfg, notif)
+                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)

hbd/server/oauth.py

@@ -0,0 +1,142 @@
+"""Gitea OAuth2 support.
+
+Config shape (in ~/.hb.yaml):
+
+    oauth:
+      gitea:
+        url: https://git.example.com
+        client_id: <client-id>
+        client_secret: <client-secret>
+
+Register a Gitea OAuth2 application at:
+  Gitea → Settings → Applications → OAuth2
+Set the redirect URI to:
+  https://<hbd-host>/login/oauth/gitea/callback
+"""
+
+import logging
+import secrets
+import time
+import urllib.parse
+
+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."""
+
+
+def _gitea_cfg(config: dict) -> dict:
+    """Return the gitea sub-dict or {} if absent/incomplete."""
+    return config.get("oauth", {}).get("gitea", {})
+
+
+def is_enabled(config: dict) -> bool:
+    """Return True when all three required Gitea OAuth keys are present."""
+    g = _gitea_cfg(config)
+    return bool(g.get("url") and g.get("client_id") and g.get("client_secret"))
+
+
+def authorization_url(config: dict, state: str, redirect_uri: str) -> str:
+    """Return the Gitea OAuth2 authorization URL to redirect the browser to."""
+    g = _gitea_cfg(config)
+    if not (g.get("url") and g.get("client_id") and g.get("client_secret")):
+        raise OAuthError("Gitea OAuth2 is not configured")
+    params = urllib.parse.urlencode({
+        "client_id": g["client_id"],
+        "redirect_uri": redirect_uri,
+        "response_type": "code",
+        "scope": "user:email",
+        "state": state,
+    })
+    return f"{g['url'].rstrip('/')}/login/oauth/authorize?{params}"
+
+
+async def exchange_code(config: dict, code: str, redirect_uri: str) -> str:
+    """Exchange an authorization *code* for a Gitea access token.
+
+    Returns the access token string.  Raises OAuthError on any failure.
+    """
+    g = _gitea_cfg(config)
+    if not (g.get("url") and g.get("client_id") and g.get("client_secret")):
+        raise OAuthError("Gitea OAuth2 is not configured")
+    url = f"{g['url'].rstrip('/')}/login/oauth/access_token"
+    payload = {
+        "client_id": g["client_id"],
+        "client_secret": g["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(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(config: dict, token: str) -> dict:
+    """Fetch the authenticated user's profile from Gitea.
+
+    Returns a dict with keys: login, full_name, avatar_url.
+    Raises OAuthError on any failure.
+    """
+    g = _gitea_cfg(config)
+    if not (g.get("url") and g.get("client_id") and g.get("client_secret")):
+        raise OAuthError("Gitea OAuth2 is not configured")
+    url = f"{g['url'].rstrip('/')}/api/v1/user"
+    timeout = aiohttp.ClientTimeout(total=10)
+    try:
+        async with aiohttp.ClientSession(timeout=timeout) as session:
+            async with session.get(url, headers={"Authorization": f"token {token}"}) 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
+    return {
+        "login": data.get("login", ""),
+        "full_name": data.get("full_name", ""),
+        "avatar_url": data.get("avatar_url", ""),
+    }

hbd/server/settings.py

@@ -24,7 +24,7 @@ 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",
+    "smtp_password", "smtp_user", "api_password", "access_token",
 })
 
 _CHANNEL_TYPE_LABELS = {
@@ -88,7 +88,7 @@ def _sanitize_channel(name, cfg):
 # Public API
 # ---------------------------------------------------------------------------
 
-def get_settings_sections(config: dict) -> list:
+def get_settings_sections(config: dict, threshold_checker=None) -> list:
     """Return ordered list of setting sections for the settings page.
 
     Each section:
@@ -181,6 +181,41 @@ def get_settings_sections(config: dict) -> list:
             "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,
+        }
+
+    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 (config.get("hosts") or {}).items():
@@ -188,7 +223,7 @@ def get_settings_sections(config: dict) -> list:
             continue
         hosts_list.append({
             "name": hname,
-            "watch": bool(hcfg.get("watch", False)),
+            "watch": bool(hcfg.get("watch", True)),
             "dyndns": bool(hcfg.get("dyndns", False)),
             "owner": hcfg.get("owner", ""),
             "managers": hcfg.get("managers", []),
@@ -312,6 +347,16 @@ def get_settings_sections(config: dict) -> list:
             "hosts": hosts_list,
             "fields": [],
         },
+        {
+            "id": "thresholds",
+            "title": "Threshold Configurations",
+            "description": "Named alert threshold sets. Each defines warning/critical levels per metric.",
+            "threshold_configs": threshold_config_list,
+            "fields": [
+                field("default_threshold_config", "Default config", "text",
+                      "Threshold config used for hosts with no explicit mapping."),
+            ],
+        },
         {
             "id": "runtime",
             "title": "Runtime",

hbd/server/templates/about.html

@@ -0,0 +1,199 @@
+<!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: 0.85em;
+      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; }
+  </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@wrede.ca">aew@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

@@ -4,12 +4,17 @@
 
   <style>
 
+    html, body {
+      height: auto;
+      overflow-y: auto;
+    }
+
     .container {
       max-width: 1400px;
       margin: 0 auto;
     }
 
-    h1 { color: #333; margin-bottom: 10px; font-size: 1.5em; }
+    h1 { color: #333; margin-bottom: 5px; margin-top: 15px; font-size: 1.5em; }
 
     .subtitle {
       color: #666;
@@ -170,14 +175,18 @@
 
     .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;
-      font-family: 'Courier New', monospace;
-      font-size: 0.9em;
+      color: #0066cc;
+      font-size: 1.1em;
+      font-weight: normal;
     }
 
     .alert-details {
@@ -400,6 +409,10 @@
         } 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 = '';
@@ -424,9 +437,9 @@
             <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>

hbd/server/templates/head.html

@@ -15,6 +15,7 @@
       body {
         margin: 0;
         padding: 10px;
+        padding-top: 60px;
         background: #f5f5f5;
       }
       h1 { font-size: 1.5em; color: #333; margin: 0 0 5px; }
@@ -23,11 +24,14 @@
 
       /* Navigation bar — shared across all pages */
       .nav {
+        position: fixed;
+        top: 0;
+        left: 0;
+        right: 0;
+        z-index: 200;
         background: #fff;
         padding: 6px 12px;
-        margin-bottom: 10px;
         box-shadow: 0 2px 4px rgba(0,0,0,.1);
-        border-radius: 4px;
         display: flex;
         align-items: center;
         justify-content: space-between;
@@ -122,11 +126,17 @@
       }
 
       /* Swiss railway clock — nav */
-      .nav-clock {
+      .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; }
@@ -204,7 +214,7 @@
         ctx.restore();
       }
 
-      hand((m + s / 60) / 60 * Math.PI * 2 - Math.PI / 2,
+      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   */

hbd/server/templates/live.html

@@ -45,6 +45,7 @@
     h1 {
       color: #333;
       margin-bottom: 5px;
+      margin-top: 15px; 
       font-size: 1.5em;
     }
 
@@ -182,11 +183,24 @@
       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; }
+
     /* Modal for connection status messages */
     .connection-modal {
       display: none;
@@ -235,6 +249,8 @@
       color: #ff9800;
       font-weight: 700;
     }
+    #ntable a.host-link { color: inherit; text-decoration: none; }
+    #ntable a.host-link:hover { text-decoration: underline; }
   </style>
   <script type="text/javascript">
     var cnt = 0;
@@ -244,11 +260,13 @@
     var HBD_VERSION = "{{ hbd_version }}";
 
     function hostNameHtml(data) {
+      var rawName = data.raw_name || data.name.replace(/<[^>]+>/g, '').replace('*', '').trim();
       var nameHtml = data.name;
       if (!data.hbc_version || data.hbc_version !== HBD_VERSION) {
         nameHtml += ' 🥀';
       }
-      return data.dyn ? '<b>' + nameHtml + '</b>' : nameHtml;
+      var display = data.dyn ? '<b>' + nameHtml + '</b>' : nameHtml;
+      return '<a class="host-link" href="/plugins#' + encodeURIComponent(rawName) + '">' + display + '</a>';
     }
 
     function setup() {
@@ -403,7 +421,7 @@
         );
         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 = "";
@@ -455,7 +473,20 @@
             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 html = '<div class="log-entry log-' + lvl + '">';
+            html += '<span class="log-ts">' + ts_str + '</span>';
+            html += '<span class="log-level">' + (msg.level || "") + '</span>';
+            if (msg.host) html += '<span class="log-host">' + msg.host + '</span>';
+            if (msg.service) html += '<span class="log-service">' + msg.service + '</span>';
+            html += '<span class="log-msg">' + msg.message + '</span>';
+            html += '</div>';
+            msgs.insertAdjacentHTML("afterbegin", html);
           }
           cnt++;
         };
@@ -510,7 +541,7 @@
           <tbody id="ntablebody">
             {% for host in hosts %}
             <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 data-name="{{ host.name }}">{{ host.name }}{% if not host.hbc_version or host.hbc_version != hbd_version %} 🥀{% endif %}</td>
+              <td data-name="{{ host.name }}"><a class="host-link" href="/plugins#{{ host.raw_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 -%}

hbd/server/templates/nav.html

@@ -4,11 +4,15 @@
   </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 %}>Plugin Metrics</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>
+  <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>
@@ -41,4 +45,52 @@
       });
     }
   })();
+
+  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);
+  });
 </script>

hbd/server/templates/settings.html

@@ -9,7 +9,7 @@
       max-width: 960px;
     }
 
-    h1 { color: #333; margin-bottom: 4px; font-size: 1.5em; }
+    h1 { color: #333; margin-bottom: 5px; margin-top: 15px; font-size: 1.5em; }
     .subtitle { color: #666; margin-bottom: 24px; font-size: 0.9em; }
 
     /* ---- Sidebar + content layout ---- */
@@ -23,7 +23,7 @@
       width: 180px;
       flex-shrink: 0;
       position: sticky;
-      top: 20px;
+      top: 60px;
     }
 
     .sidebar-nav a {
@@ -254,6 +254,17 @@
     .host-bool { text-align: center; }
     .dot-yes { color: #2e7d32; font-size: 1.1em; }
     .dot-no  { color: #ddd;    font-size: 1.1em; }
+
+    /* ---- Threshold configurations ---- */
+    .thresh-config { margin: 12px 20px 20px; }
+    .thresh-config-name {
+      font-weight: 600; font-size: 0.9em; color: #1a237e;
+      margin-bottom: 6px;
+    }
+    .mini-table .warn  { color: #e65100; font-weight: 600; }
+    .mini-table .crit  { color: #b71c1c; font-weight: 600; }
+    .mini-table .dim   { color: #aaa; }
+    .mini-table .metric-path { font-family: monospace; font-size: 0.88em; }
   </style>
 
   <body>
@@ -394,6 +405,49 @@
             {% endif %}
             {% endif %}
 
+            {# ---- Threshold configurations section ---- #}
+            {% if section.id == "thresholds" %}
+            {% if section.threshold_configs %}
+            {% for tc in section.threshold_configs %}
+            <div class="thresh-config">
+              <div class="thresh-config-name">{{ tc.name }}</div>
+              {% if tc.metrics %}
+              <div style="overflow-x: auto;">
+                <table class="mini-table">
+                  <thead>
+                    <tr>
+                      <th>Metric</th>
+                      <th>Op</th>
+                      <th>Warning</th>
+                      <th>Critical</th>
+                      <th>Hysteresis</th>
+                      <th>Count</th>
+                    </tr>
+                  </thead>
+                  <tbody>
+                    {% for m in tc.metrics %}
+                    <tr {% if not m.enabled %} style="opacity:0.45"{% endif %}>
+                      <td class="metric-path">{{ m.metric }}</td>
+                      <td>{{ m.operator or '>' }}</td>
+                      <td class="warn">{{ m.warning if m.warning is not none else '—' }}</td>
+                      <td class="crit">{{ m.critical if m.critical is not none else '—' }}</td>
+                      <td class="dim">{{ '%.0f%%' % (m.hysteresis * 100) if m.hysteresis else '—' }}</td>
+                      <td class="dim">{{ m.count }}</td>
+                    </tr>
+                    {% endfor %}
+                  </tbody>
+                </table>
+              </div>
+              {% else %}
+              <span class="val-empty">No thresholds defined.</span>
+              {% endif %}
+            </div>
+            {% endfor %}
+            {% else %}
+            <div class="field-row"><span class="val-empty">No threshold configurations defined.</span></div>
+            {% endif %}
+            {% endif %}
+
             {# ---- Hosts section ---- #}
             {% if section.id == "hosts" %}
             {% if section.hosts %}

hbd/server/threshold.py

@@ -9,10 +9,11 @@ This module provides a flexible threshold checking system that:
 - Supports multiple comparison operators
 """
 
+import asyncio
 import logging
 import time
 from enum import Enum
-from typing import Dict, Any, Optional, Tuple, Callable
+from typing import Dict, List, Any, Optional, Tuple, Callable
 from . import notify as notify_mod
 from .config import THRESHOLD_DEFAULTS
 
@@ -29,12 +30,13 @@ class AlertLevel(Enum):
 
 class ComparisonOperator(Enum):
     """Supported comparison operators for threshold checks."""
-    GT = ">"      # Greater than
-    GTE = ">="    # Greater than or equal
-    LT = "<"      # Less than
-    LTE = "<="    # Less than or equal
-    EQ = "=="     # Equal to
-    NEQ = "!="    # Not equal to
+    GT = ">"        # Greater than
+    GTE = ">="      # Greater than or equal
+    LT = "<"        # Less than
+    LTE = "<="      # Less than or equal
+    EQ = "=="       # Equal to
+    NEQ = "!="      # Not equal to
+    NAGIOS = "nagios"  # Nagios exit-code semantics: 0=OK 1=WARNING 2=CRITICAL 3=UNKNOWN
 
 
 class AlertState:
@@ -56,6 +58,7 @@ class AlertState:
         self.last_notification = None
         self.threshold_value = None  # The threshold value that triggered alert
         self.operator = None  # The comparison operator (>, <, >=, etc.)
+        self.hysteresis: Optional[float] = None  # Hysteresis fraction used for recovery
         self.formatted_message = None  # Formatted display message for UI
         self.acknowledged = False  # Whether alert has been acknowledged
         self.acknowledged_at = None  # Timestamp when acknowledged
@@ -151,6 +154,15 @@ class AlertState:
         if self.formatted_message is not None:
             result["formatted_message"] = self.formatted_message
 
+        # Compute and expose the recovery threshold so the UI can display it
+        if (self.hysteresis and self.threshold_value is not None
+                and self.operator is not None):
+            ha = abs(self.threshold_value * self.hysteresis)
+            if self.operator in ('>', '>='):
+                result["recovery_threshold"] = round(self.threshold_value - ha, 4)
+            elif self.operator in ('<', '<='):
+                result["recovery_threshold"] = round(self.threshold_value + ha, 4)
+
         return result
     
     def __setstate__(self, state):
@@ -158,6 +170,8 @@ class AlertState:
         self.__dict__.update(state)
         if not hasattr(self, 'consecutive_count'):
             self.consecutive_count = 0
+        if not hasattr(self, 'hysteresis'):
+            self.hysteresis = None
 
     def acknowledge(self):
         """Acknowledge this alert to stop reminder notifications."""
@@ -226,6 +240,16 @@ class ThresholdConfig:
         if not self.enabled:
             return AlertLevel.OK
 
+        # Nagios exit-code semantics: value IS the severity
+        if self.operator == ComparisonOperator.NAGIOS:
+            try:
+                code = int(value)
+            except (TypeError, ValueError):
+                return AlertLevel.UNKNOWN
+            return {0: AlertLevel.OK, 1: AlertLevel.WARNING, 2: AlertLevel.CRITICAL}.get(
+                code, AlertLevel.UNKNOWN
+            )
+
         try:
             # Convert value to float for comparison
             value = float(value)
@@ -262,6 +286,10 @@ class ThresholdConfig:
         """
         new_level = self.evaluate(value)
 
+        # Nagios exit codes are discrete integers — hysteresis doesn't apply
+        if self.operator == ComparisonOperator.NAGIOS:
+            return new_level
+
         # If no hysteresis, return new level
         if self.hysteresis == 0.0:
             return new_level
@@ -328,14 +356,17 @@ class ThresholdChecker:
             renotify_interval: Seconds between repeat notifications (default: 1 hour)
             journal: Optional MessageJournal instance for logging threshold events
         """
-        # Named threshold configurations: {config_name: {metric_path: ThresholdConfig}}
+        # Named threshold configurations (pre-merged: defaults + overrides): {config_name: {metric_path: ThresholdConfig}}
         self.threshold_configs = {}
 
+        # Raw overrides only for each named config (no defaults baked in): {config_name: {metric_path: ThresholdConfig}}
+        self.threshold_raw_configs: Dict[str, Dict[str, ThresholdConfig]] = {}
+
         # Single threshold set for backward compatibility: {metric_path: ThresholdConfig}
         self.thresholds = {}
 
-        # Host to config name mapping: {host_name: config_name}
-        self.host_config_mapping = {}
+        # Host to ordered list of config names: {host_name: [config_name, ...]}
+        self.host_config_mapping: Dict[str, List[str]] = {}
 
         # Default config name to use when no mapping exists
         self.default_config = "default"
@@ -372,6 +403,7 @@ class ThresholdChecker:
         
         # Clear old configuration
         self.threshold_configs.clear()
+        self.threshold_raw_configs.clear()
         self.thresholds.clear()
         self.host_config_mapping.clear()
         self.grace_seconds = float(config.get("grace", 2))
@@ -391,10 +423,24 @@ class ThresholdChecker:
         Supports two formats:
         1. Legacy format with direct 'thresholds' section
         2. New format with 'threshold_configs' and 'host_threshold_mapping'
+
+        In all cases, THRESHOLD_DEFAULTS are seeded into threshold_configs["default"]
+        so the Settings page always shows the built-in defaults.
+        _parse_multi_config() overwrites this with the fully-merged effective defaults.
         """
+        # Always expose built-in defaults through threshold_configs["default"] so
+        # the Settings page has something to display even in legacy/no-config mode.
+        seed: Dict[str, ThresholdConfig] = {}
+        for plugin_name, plugin_thresholds in THRESHOLD_DEFAULTS.get("thresholds", {}).items():
+            if isinstance(plugin_thresholds, dict):
+                self._parse_plugin_thresholds(plugin_name, plugin_thresholds, target_dict=seed)
+        if seed:
+            self.threshold_configs["default"] = seed
+            self.threshold_raw_configs["default"] = {}
+
         # Check for new multi-config format
         if "threshold_configs" in config:
-            self._parse_multi_config(config)
+            self._parse_multi_config(config)  # overwrites threshold_configs["default"]
         elif "thresholds" in config:
             # Legacy single threshold configuration
             self._parse_legacy_config(config)
@@ -424,9 +470,10 @@ class ThresholdChecker:
                         self._parse_plugin_thresholds(plugin_name, plugin_thresholds, target_dict=effective_defaults)
 
         self.threshold_configs["default"] = dict(effective_defaults)
+        self.threshold_raw_configs["default"] = {}
         logger.info("Registered 'default' threshold config with %d metrics", len(effective_defaults))
 
-        # Parse each named configuration, seeding it with effective_defaults first
+        # Parse each named configuration
         for config_name, config_data in threshold_configs.items():
             if config_name == "default":
                 continue  # already handled above
@@ -440,33 +487,41 @@ class ThresholdChecker:
                 continue
 
             logger.info("Parsing threshold configuration: %s", config_name)
-            self.threshold_configs[config_name] = dict(effective_defaults)
 
+            # Raw overrides only (used for multi-config layering)
+            raw_overrides: Dict[str, ThresholdConfig] = {}
             thresholds_config = config_data["thresholds"]
             for plugin_name, plugin_thresholds in thresholds_config.items():
-                if not isinstance(plugin_thresholds, dict):
-                    continue
+                if isinstance(plugin_thresholds, dict):
+                    self._parse_plugin_thresholds(plugin_name, plugin_thresholds, target_dict=raw_overrides)
+            self.threshold_raw_configs[config_name] = raw_overrides
 
-                self._parse_plugin_thresholds(
-                    plugin_name,
-                    plugin_thresholds,
-                    target_dict=self.threshold_configs[config_name]
-                )
+            # Pre-merged version (defaults + overrides) for single-config fast path
+            self.threshold_configs[config_name] = dict(effective_defaults)
+            self.threshold_configs[config_name].update(raw_overrides)
 
-        # Parse host to config mapping from two possible sources
-        # 1. New format: hosts section with threshold_config attribute
+        # Parse host → config list mapping from two possible sources
+
+        def _normalise(value) -> List[str]:
+            """Accept a string or list; always return a list."""
+            if isinstance(value, list):
+                return [str(v) for v in value]
+            return [str(value)]
+
+        # 1. hosts section with threshold_config attribute (string or list)
         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 "threshold_config" in host_attrs:
-                        self.host_config_mapping[host_name] = host_attrs["threshold_config"]
+                        self.host_config_mapping[host_name] = _normalise(host_attrs["threshold_config"])
 
-        # 2. Legacy format: host_threshold_mapping section (for backward compatibility)
+        # 2. Legacy host_threshold_mapping section (string values only)
         if "host_threshold_mapping" in config:
             legacy_mapping = config.get("host_threshold_mapping", {})
             if isinstance(legacy_mapping, dict):
-                self.host_config_mapping.update(legacy_mapping)
+                for host_name, value in legacy_mapping.items():
+                    self.host_config_mapping[host_name] = _normalise(value)
         
         # Set default config (first one alphabetically or explicitly set)
         self.default_config = config.get("default_threshold_config", "default")
@@ -520,10 +575,13 @@ class ThresholdChecker:
             if not isinstance(threshold_config, dict):
                 continue
             
-            # Handle nested metrics (e.g., partitions./.percent)
+            # Handle nested metrics (e.g., partitions./.percent or pools.*.status)
             if metric_name == "partitions":
                 self._parse_partition_thresholds(plugin_name, threshold_config, target_dict)
                 continue
+            if metric_name == "pools":
+                self._parse_pool_thresholds(plugin_name, threshold_config, target_dict)
+                continue
             
             metric_path = f"{plugin_name}.{metric_name}"
             
@@ -531,11 +589,14 @@ class ThresholdChecker:
             warning = threshold_config.get("warning")
             critical = threshold_config.get("critical")
             operator = threshold_config.get("operator", ">")
-            display = threshold_config.get("display", "(threshold: {op_symbol} {threshold_value})")
-            hysteresis = threshold_config.get("hysteresis", 0.1)  # 10% default
+            # Nagios operator maps exit codes directly; no numeric thresholds needed
+            is_nagios_op = (operator == "nagios")
+            default_display = "{check_name}: {output}" if is_nagios_op else "(threshold: {op_symbol} {threshold_value})"
+            display = threshold_config.get("display", default_display)
+            hysteresis = threshold_config.get("hysteresis", 0.0 if is_nagios_op else 0.02)
             enabled = threshold_config.get("enabled", True)
 
-            if warning is None and critical is None:
+            if warning is None and critical is None and not is_nagios_op:
                 logger.warning("No thresholds defined for %s, skipping", metric_path)
                 continue
             
@@ -606,6 +667,56 @@ class ThresholdChecker:
                 
                 target_dict[metric_path] = threshold
 
+    def _parse_pool_thresholds(
+        self,
+        plugin_name: str,
+        pools: Dict[str, Any],
+        target_dict: Optional[Dict[str, ThresholdConfig]] = None,
+    ):
+        """Parse ZFS pool thresholds.  Pool names may be literal or '*' (all pools).
+
+        Config shape::
+
+            zfs_monitor:
+              pools:
+                '*':
+                  status:
+                    warning: 1
+                    critical: 2
+                    operator: '>'
+                tank:
+                  capacity:
+                    warning: 80
+                    critical: 90
+        """
+        if target_dict is None:
+            target_dict = self.thresholds
+
+        for pool_name, metrics in pools.items():
+            if not isinstance(metrics, dict):
+                continue
+            for metric_name, threshold_config in metrics.items():
+                if not isinstance(threshold_config, dict):
+                    continue
+                metric_path = f"{plugin_name}.{pool_name}.{metric_name}"
+                warning = threshold_config.get("warning")
+                critical = threshold_config.get("critical")
+                operator = threshold_config.get("operator", ">")
+                hysteresis = threshold_config.get("hysteresis", 0.02)
+                enabled = threshold_config.get("enabled", True)
+                display = threshold_config.get("display")
+                if warning is None and critical is None:
+                    continue
+                target_dict[metric_path] = ThresholdConfig(
+                    metric_path=metric_path,
+                    warning=warning,
+                    critical=critical,
+                    operator=operator,
+                    hysteresis=hysteresis,
+                    enabled=enabled,
+                    display=display,
+                )
+
     def _parse_rtt_thresholds(
         self,
         rtt_thresholds: Dict[str, Any],
@@ -635,7 +746,7 @@ class ThresholdChecker:
         warning = rtt_thresholds.get("warning")
         critical = rtt_thresholds.get("critical")
         operator = rtt_thresholds.get("operator", ">")
-        hysteresis = rtt_thresholds.get("hysteresis", 0.1)  # 10% default
+        hysteresis = rtt_thresholds.get("hysteresis", 0.02)  # 2% default
         enabled = rtt_thresholds.get("enabled", True)
         display = rtt_thresholds.get("display")
         count = rtt_thresholds.get("count", 1)
@@ -664,7 +775,10 @@ class ThresholdChecker:
         )
     
     def get_thresholds_for_host(self, host_name: str) -> Dict[str, ThresholdConfig]:
-        """Get the appropriate threshold configuration for a host.
+        """Get the effective threshold configuration for a host.
+
+        When threshold_config is a list, configs are applied left-to-right on top
+        of the default thresholds so earlier entries can be overridden by later ones.
 
         Args:
             host_name: Name of the host
@@ -676,23 +790,40 @@ class ThresholdChecker:
         if self.thresholds and not self.threshold_configs:
             return self.thresholds
 
-        # Multi-config mode: look up host-specific configuration
-        if self.threshold_configs:
-            config_name = self.host_config_mapping.get(host_name, self.default_config)
+        if not self.threshold_configs:
+            return {}
 
-            if config_name in self.threshold_configs:
-                return self.threshold_configs[config_name]
-            else:
+        config_names = self.host_config_mapping.get(host_name)
+
+        # No host-specific mapping → return pre-merged default
+        if not config_names:
+            return self.threshold_configs.get(self.default_config, {})
+
+        # Single config → fast path using pre-merged copy
+        if len(config_names) == 1:
+            name = config_names[0]
+            if name in self.threshold_configs:
+                return self.threshold_configs[name]
+            logger.warning(
+                "Threshold config '%s' not found for host '%s', using default '%s'",
+                name, host_name, self.default_config,
+            )
+            return self.threshold_configs.get(self.default_config, {})
+
+        # Multiple configs → start from defaults, layer raw overrides in order
+        result = dict(self.threshold_configs.get(self.default_config, {}))
+        for name in config_names:
+            if name == self.default_config:
+                continue  # defaults already the base
+            raw = self.threshold_raw_configs.get(name)
+            if raw is None:
                 logger.warning(
-                    "Threshold config '%s' not found for host '%s', using default '%s'",
-                    config_name,
-                    host_name,
-                    self.default_config
+                    "Threshold config '%s' not found for host '%s', skipping",
+                    name, host_name,
                 )
-                return self.threshold_configs.get(self.default_config, {})
-        
-        # No thresholds configured
-        return {}
+            else:
+                result.update(raw)
+        return result
     
     def check_value(
         self,
@@ -760,6 +891,12 @@ class ThresholdChecker:
         elif new_level == AlertLevel.WARNING and threshold.warning is not None:
             threshold_value = threshold.warning
 
+        # Keep hysteresis on the state so the UI can show the recovery threshold
+        if new_level != AlertLevel.OK:
+            alert_state.hysteresis = threshold.hysteresis
+        else:
+            alert_state.hysteresis = None
+
         # Update state and check for changes
         old_level = alert_state.level
         if alert_state.update(new_level, value, threshold_value, threshold.operator.value):
@@ -769,6 +906,36 @@ class ThresholdChecker:
             self._check_pending_or_renotify(host_name, alert_state, metric_path, value, threshold, None)
 
         return None
+    def _find_threshold(
+        self, thresholds: Dict[str, "ThresholdConfig"], metric_path: str
+    ) -> Tuple[Optional["ThresholdConfig"], Optional[str]]:
+        """Return (threshold, check_name) for *metric_path*, falling back to suffix matches.
+
+        Allows generic thresholds like ``nagios_runner.status_code`` to match
+        fully-qualified paths like ``nagios_runner.check_disk_root_status_code``.
+        The exact match is always tried first; then successive leading
+        underscore-delimited segments are stripped from the field name until
+        a match is found or no segments remain.
+
+        Returns:
+            (ThresholdConfig, None) for an exact match.
+            (ThresholdConfig, "check_disk_root") for a suffix match — the second
+            element is the stripped prefix, available as ``{check_name}`` in
+            display format templates.
+            (None, None) when no threshold is found.
+        """
+        if metric_path in thresholds:
+            return thresholds[metric_path], None
+        plugin, sep, field = metric_path.partition(".")
+        if not sep:
+            return None, None
+        parts = field.split("_")
+        for i in range(1, len(parts)):
+            candidate = plugin + "." + "_".join(parts[i:])
+            if candidate in thresholds:
+                return thresholds[candidate], "_".join(parts[:i])
+        return None, None
+
     def check_plugin_data(
         self,
         host_name: str,
@@ -797,11 +964,10 @@ class ThresholdChecker:
         for metric_name, value in data.items():
             metric_path = f"{plugin_name}.{metric_name}"
 
-            if metric_path not in thresholds:
+            threshold, check_name = self._find_threshold(thresholds, metric_path)
+            if threshold is None:
                 continue
 
-            threshold = thresholds[metric_path]
-            
             # Get or create alert state
             if metric_path not in alert_states:
                 alert_states[metric_path] = AlertState(metric_path)
@@ -821,13 +987,15 @@ class ThresholdChecker:
             elif new_level == AlertLevel.WARNING and threshold.warning is not None:
                 threshold_value = threshold.warning
 
+            alert_state.hysteresis = threshold.hysteresis if new_level != AlertLevel.OK else None
+
             # Update state and check for changes
             old_level = alert_state.level
             if alert_state.update(new_level, value, threshold_value, threshold.operator.value):
                 state_changes.append((metric_path, old_level, new_level, value))
-                self._apply_grace(host_name, alert_state, metric_path, old_level, new_level, value, threshold, data)
+                self._apply_grace(host_name, alert_state, metric_path, old_level, new_level, value, threshold, data, check_name=check_name, metric_name=metric_name)
             elif new_level != AlertLevel.OK:
-                self._check_pending_or_renotify(host_name, alert_state, metric_path, value, threshold, data)
+                self._check_pending_or_renotify(host_name, alert_state, metric_path, value, threshold, data, check_name=check_name, metric_name=metric_name)
 
         # Check nested metrics (e.g., partition data in disk_monitor)
         self._check_nested_metrics(
@@ -852,6 +1020,44 @@ class ThresholdChecker:
         # Get host-specific thresholds
         thresholds = self.get_thresholds_for_host(host_name)
         
+        # ZFS pool health checks
+        if plugin_name == "zfs_monitor" and "pools" in data:
+            pools = data["pools"]
+            if isinstance(pools, dict):
+                for pool_name, pool_metrics in pools.items():
+                    if not isinstance(pool_metrics, dict):
+                        continue
+                    # Synthesize status from health string for older clients
+                    # that predate the status field.
+                    pool_metrics_effective = dict(pool_metrics)
+                    if "health" in pool_metrics and "status" not in pool_metrics:
+                        pool_metrics_effective["status"] = 0 if pool_metrics["health"] == "ONLINE" else 1
+                    for metric_name, value in pool_metrics_effective.items():
+                        # Try specific pool name first, then wildcard '*'
+                        metric_path = f"{plugin_name}.{pool_name}.{metric_name}"
+                        wildcard_path = f"{plugin_name}.*.{metric_name}"
+                        threshold = thresholds.get(metric_path) or thresholds.get(wildcard_path)
+                        if threshold is None:
+                            continue
+                        if metric_path not in alert_states:
+                            alert_states[metric_path] = AlertState(metric_path)
+                        alert_state = alert_states[metric_path]
+                        new_level = threshold.evaluate_with_hysteresis(value, alert_state.level)
+                        threshold_value = None
+                        if new_level == AlertLevel.CRITICAL and threshold.critical is not None:
+                            threshold_value = threshold.critical
+                        elif new_level == AlertLevel.WARNING and threshold.warning is not None:
+                            threshold_value = threshold.warning
+                        alert_state.hysteresis = threshold.hysteresis if new_level != AlertLevel.OK else None
+                        pool_context = dict(pool_metrics_effective)
+                        pool_context["pool_name"] = pool_name
+                        old_level = alert_state.level
+                        if alert_state.update(new_level, value, threshold_value, threshold.operator.value):
+                            state_changes.append((metric_path, old_level, new_level, value))
+                            self._apply_grace(host_name, alert_state, metric_path, old_level, new_level, value, threshold, pool_context, metric_name=pool_name)
+                        elif new_level != AlertLevel.OK:
+                            self._check_pending_or_renotify(host_name, alert_state, metric_path, value, threshold, pool_context, metric_name=pool_name)
+
         # Look for partition data in disk_monitor
         if plugin_name == "disk_monitor" and "partitions" in data:
             partitions = data["partitions"]
@@ -887,6 +1093,8 @@ class ThresholdChecker:
                     elif new_level == AlertLevel.WARNING and threshold.warning is not None:
                         threshold_value = threshold.warning
 
+                    alert_state.hysteresis = threshold.hysteresis if new_level != AlertLevel.OK else None
+
                     old_level = alert_state.level
                     if alert_state.update(new_level, value, threshold_value, threshold.operator.value):
                         state_changes.append((metric_path, old_level, new_level, value))
@@ -903,6 +1111,8 @@ class ThresholdChecker:
         value: Any,
         threshold: ThresholdConfig,
         plugin_data: Optional[Dict[str, Any]] = None,
+        check_name: Optional[str] = None,
+        metric_name: Optional[str] = None,
     ):
         """Trigger a notification for an alert state change.
         
@@ -925,55 +1135,53 @@ class ThresholdChecker:
         # Format operator symbol
         op_symbol = threshold.operator.value
 
+        # Short metric label: strip the plugin-name prefix and _status_code suffix
+        short_path = (metric_path.partition(".")[2] or metric_path).removesuffix("_status_code")
+
         # Use a display-friendly value (inf is the sentinel for "overdue")
         import math
         display_value = "overdue" if isinstance(value, float) and math.isinf(value) else value
 
-        # Format message
-        if new_level == AlertLevel.OK:
-            lvl = "RECOVER"
-            message = f"{metric_path} = {display_value} ({old_level.name} -> OK)"
-        elif new_level == AlertLevel.WARNING:
-            lvl = "WARNING"
-            if threshold_value is not None:
-                threshold_info = self._format_display(
-                    threshold.display,
-                    value=display_value,
-                    threshold_value=threshold_value,
-                    op_symbol=op_symbol,
-                    plugin_data=plugin_data
-                )
-                message = f"{metric_path} = {display_value} {threshold_info}"
-            else:
-                message = f"{metric_path} = {display_value}"
-        elif new_level == AlertLevel.CRITICAL:
-            lvl = "CRITICAL"
-            if threshold_value is not None:
-                threshold_info = self._format_display(
-                    threshold.display,
-                    value=display_value,
-                    threshold_value=threshold_value,
-                    op_symbol=op_symbol,
-                    plugin_data=plugin_data
-                )
-                message = f"{metric_path} = {display_value} {threshold_info}"
-            else:
-                message = f"{metric_path} = {display_value}"
-        else:
-            lvl = "UNKNOWN"
-            message = f"{metric_path} = {display_value}"
+        # Format message — for the nagios operator there is no numeric threshold_value;
+        # render the display template whenever one is available.
+        has_display = threshold_value is not None or threshold.operator == ComparisonOperator.NAGIOS
 
-        # Return the formatted threshold info for storing in AlertState
-        formatted_threshold_msg = None
-        if threshold_value is not None and new_level != AlertLevel.OK:
-            formatted_threshold_msg = self._format_display(
+        def _fmt():
+            return self._format_display(
                 threshold.display,
                 value=display_value,
                 threshold_value=threshold_value,
                 op_symbol=op_symbol,
-                plugin_data=plugin_data
+                plugin_data=plugin_data,
+                check_name=check_name,
+                metric_name=metric_name,
             )
 
+        if new_level == AlertLevel.OK:
+            lvl = "RECOVER"
+            message = f"{short_path} = {display_value} ({old_level.name} -> OK)"
+        elif new_level == AlertLevel.WARNING:
+            lvl = "WARNING"
+            if has_display:
+                message = f"{short_path} = {display_value} {_fmt()}"
+            else:
+                message = f"{short_path} = {display_value}"
+        elif new_level == AlertLevel.CRITICAL:
+            lvl = "CRITICAL"
+            if has_display:
+                message = f"{short_path} = {display_value} {_fmt()}"
+            else:
+                message = f"{short_path} = {display_value}"
+        else:
+            lvl = "UNKNOWN"
+            if has_display:
+                message = f"{short_path} = {display_value} {_fmt()}"
+            else:
+                message = f"{short_path} = {display_value}"
+
+        # Formatted threshold info stored on AlertState for the UI
+        formatted_threshold_msg = _fmt() if has_display and new_level != AlertLevel.OK else None
+
         return lvl, message, formatted_threshold_msg
     
     def _send_notification(
@@ -987,23 +1195,28 @@ class ThresholdChecker:
         value: Any,
     ):
         """Send notification and log to journal/eventlog."""
-        try:
-            notify_mod.send_notification(
-                host_name,
-                notify_mod.Notification(
-                    title=f"[{lvl}] {host_name}",
-                    body=message,
-                    level=lvl,
-                ),
-            )
-            logger.info("Notification sent: %s", message)
-        except Exception as e:
-            logger.error("Failed to send notification: %s", e)
+        from . import hbdclass
+        host = hbdclass.Host.hosts.get(host_name)
+        if host is not None and not host.watched:
+            eventlog(host_name, lvl, message, service="threshold")
+            return
+        short_path = (metric_path.partition(".")[2] or metric_path).removesuffix("_status_code")
+        title = f"[{lvl}] {host_name}  {short_path}"
+        # Strip the "metric = " prefix from message so body is just the value/detail
+        prefix = short_path + " = "
+        body = message[len(prefix):] if message.startswith(prefix) else message
+        asyncio.get_event_loop().create_task(notify_mod.send_notification(
+            host_name,
+            notify_mod.Notification(
+                title=title,
+                body=body,
+                level=lvl,
+            ),
+        ))
         
         # Log to journal
         if self.journal is not None:
             try:
-                import asyncio
                 loop = asyncio.get_event_loop()
                 loop.create_task(self.journal.log_threshold_event(
                     host_name=host_name,
@@ -1021,33 +1234,62 @@ class ThresholdChecker:
         self,
         display_format: str,
         value: Any,
-        threshold_value: float,
+        threshold_value: Optional[float],
         op_symbol: str,
         plugin_data: Optional[Dict[str, Any]] = None,
+        check_name: Optional[str] = None,
+        metric_name: Optional[str] = None,
     ) -> str:
         """Format the display string using available data.
 
-        Args:
-            display_format: Format string from threshold config
-            value: Current metric value
-            threshold_value: Threshold value that was exceeded
-            op_symbol: Comparison operator symbol
-            plugin_data: Optional dictionary of plugin data fields
+        Available template variables:
+            {value}           - current metric value
+            {threshold_value} - threshold that was exceeded
+            {op_symbol}       - comparison operator (>, <, >=, <=, ==, !=)
+            {check_name}      - prefix stripped for generic threshold match
+                                (e.g. "check_disk_root" when metric
+                                "check_disk_root_status_code" matched generic
+                                threshold "status_code")
+            {metric_name}     - field name within the plugin data dict
+            Any key from plugin_data is also available.
 
         Returns:
             Formatted display string
         """
+        if not display_format:
+            display_format = "(threshold: {op_symbol} {threshold_value})" if threshold_value is not None else ""
+
         # Build format context with standard variables
         format_context = {
             'value': value,
-            'threshold_value': threshold_value,
             'op_symbol': op_symbol,
         }
+        if threshold_value is not None:
+            format_context['threshold_value'] = threshold_value
+
+        # Add generic-match context variables when available
+        if check_name is not None:
+            format_context['check_name'] = check_name
+        if metric_name is not None:
+            format_context['metric_name'] = metric_name
 
         # Add all plugin data fields if available
         if plugin_data:
             format_context.update(plugin_data)
 
+        # For nagios_runner generic matches, expose the matched check's output
+        # and status as short aliases {output} and {status} so display templates
+        # don't need to use the full {check_disk_root_output} form.
+        if check_name and plugin_data:
+            if 'output' not in format_context:
+                output = plugin_data.get(f"{check_name}_output")
+                if output is not None:
+                    format_context['output'] = output
+            if 'status' not in format_context:
+                status = plugin_data.get(f"{check_name}_status")
+                if status is not None:
+                    format_context['status'] = status
+        
         try:
             # Format the display string
             return display_format.format(**format_context)
@@ -1077,17 +1319,22 @@ class ThresholdChecker:
         value: Any,
         threshold: ThresholdConfig,
         plugin_data: Optional[Dict[str, Any]],
+        check_name: Optional[str] = None,
+        metric_name: Optional[str] = None,
     ) -> None:
         """Handle a state-change transition with grace-period logic.
 
-        Transitioning INTO alert: defers the notification for grace_seconds.
+        Transitioning INTO alert (worsening): defers the notification for grace_seconds.
+        De-escalation within alert states (e.g. CRITICAL→WARNING): no new notification;
+          the metric is still alerting so no RECOVER was sent.
         Transitioning TO OK:
           - Still in grace window (pending_since set): suppresses both the alert
             and the recovery — the spike never warranted a page.
           - Past grace: fires the RECOVER notification normally.
         """
         lvl, message, formatted_msg = self._trigger_notification(
-            host_name, metric_path, old_level, new_level, value, threshold, plugin_data
+            host_name, metric_path, old_level, new_level, value, threshold, plugin_data,
+            check_name=check_name, metric_name=metric_name,
         )
         alert_state.formatted_message = formatted_msg
 
@@ -1100,12 +1347,20 @@ class ThresholdChecker:
                 alert_state.pending_since = None
             else:
                 self._send_notification(host_name, lvl, message, metric_path, old_level, new_level, value)
-        else:
+        elif new_level.value > old_level.value:
+            # Worsening (OK→WARNING, OK→CRITICAL, WARNING→CRITICAL): schedule notification.
             alert_state.pending_since = time.time()
             logger.debug(
                 "Alert deferred (%.0fs grace): %s on %s = %s",
                 self.grace_seconds, metric_path, host_name, value,
             )
+        else:
+            # De-escalation within alert states (e.g. CRITICAL→WARNING): metric is still
+            # alerting but did not recover, so no new notification.
+            logger.debug(
+                "De-escalation %s→%s for %s on %s, no notification",
+                old_level.name, new_level.name, metric_path, host_name,
+            )
 
     def _check_pending_or_renotify(
         self,
@@ -1115,6 +1370,8 @@ class ThresholdChecker:
         value: Any,
         threshold: ThresholdConfig,
         plugin_data: Optional[Dict[str, Any]],
+        check_name: Optional[str] = None,
+        metric_name: Optional[str] = None,
     ) -> None:
         """Called when alert level is unchanged and non-OK.
 
@@ -1124,7 +1381,8 @@ class ThresholdChecker:
         if alert_state.pending_since is not None:
             if time.time() - alert_state.pending_since >= self.grace_seconds:
                 lvl, message, formatted_msg = self._trigger_notification(
-                    host_name, metric_path, AlertLevel.OK, alert_state.level, value, threshold, plugin_data
+                    host_name, metric_path, AlertLevel.OK, alert_state.level, value, threshold, plugin_data,
+                    check_name=check_name, metric_name=metric_name,
                 )
                 alert_state.formatted_message = formatted_msg
                 self._send_notification(
@@ -1133,7 +1391,7 @@ class ThresholdChecker:
                 alert_state.pending_since = None
             # else: still within grace window, do nothing
         else:
-            self._check_renotify(host_name, alert_state, metric_path, value, threshold, plugin_data)
+            self._check_renotify(host_name, alert_state, metric_path, value, threshold, plugin_data, check_name=check_name, metric_name=metric_name)
 
     def _check_renotify(
         self,
@@ -1143,6 +1401,8 @@ class ThresholdChecker:
         value: Any,
         threshold: ThresholdConfig,
         plugin_data: Optional[Dict[str, Any]] = None,
+        check_name: Optional[str] = None,
+        metric_name: Optional[str] = None,
     ):
         """Check if we should send a repeat notification.
         
@@ -1180,6 +1440,7 @@ class ThresholdChecker:
             
             # Format operator symbol
             op_symbol = threshold.operator.value
+            short_path = (metric_path.partition(".")[2] or metric_path).removesuffix("_status_code")
 
             # Time to re-notify
             if threshold_value is not None:
@@ -1189,26 +1450,49 @@ class ThresholdChecker:
                     value=value,
                     threshold_value=threshold_value,
                     op_symbol=op_symbol,
-                    plugin_data=plugin_data
+                    plugin_data=plugin_data,
+                    check_name=check_name,
+                    metric_name=metric_name,
                 )
-                message = f"REMINDER ({alert_state.level.name}): {host_name} - {metric_path} = {value} {threshold_info}, ongoing for {int(now - alert_state.since)}s"
+                body = f"{value} {threshold_info}, ongoing for {int(now - alert_state.since)}s"
             else:
-                message = f"REMINDER ({alert_state.level.name}): {host_name} - {metric_path} = {value} (ongoing for {int(now - alert_state.since)}s)"
+                body = f"{value} (ongoing for {int(now - alert_state.since)}s)"
+            message = f"REMINDER ({alert_state.level.name}): {host_name} - {short_path} = {body}"
 
-            try:
-                notify_mod.send_notification(
+            from . import hbdclass
+            host = hbdclass.Host.hosts.get(host_name)
+            if host is None or host.watched:
+                asyncio.get_event_loop().create_task(notify_mod.send_notification(
                     host_name,
                     notify_mod.Notification(
-                        title=f"[REMINDER/{alert_state.level.name}] {host_name}",
-                        body=message,
+                        title=f"[REMINDER/{alert_state.level.name}] {host_name}  {short_path}",
+                        body=body,
                         level=alert_state.level.name,
                     ),
-                )
-                alert_state.last_notification = now
-                alert_state.notification_count += 1
+                ))
                 logger.info("Re-notification sent: %s", message)
-            except Exception as e:
-                logger.error("Failed to send re-notification: %s", e)
+            alert_state.last_notification = now
+            alert_state.notification_count += 1
+    
+    def purge_stale_alerts(self, hbdclass) -> None:
+        """Remove alert states that have no matching threshold configuration.
+
+        Called after startup (pickle restore) and after each config reload so
+        that alerts orphaned by configuration changes do not linger forever.
+        Alerts whose metric_path is not present in the current threshold config
+        for that host are silently dropped.
+        """
+        for hostname, host in hbdclass.Host.hosts.items():
+            if not host.alert_states:
+                continue
+            configured = self.get_thresholds_for_host(hostname)
+            stale = [mp for mp in host.alert_states if self._find_threshold(configured, mp)[0] is None]
+            for mp in stale:
+                logger.info(
+                    "Purging stale alert state for %s / %s (no threshold configured)",
+                    hostname, mp,
+                )
+                del host.alert_states[mp]
 
     def get_active_alerts(self, alert_states: Dict[str, AlertState]) -> list:
         """

hbd/server/udp.py

@@ -211,10 +211,11 @@ def _make_timer_callbacks(uname, host, ctx):
         connection.newstate(connection.__class__.OVERDUE, now, cfg.get("grace", 2))
         msg = f"{connection.afam} overdue"
         eventlog(uname, "CRITICAL", msg)
-        notify_mod.send_notification(
-            uname,
-            notify_mod.Notification(title=f"[CRITICAL] {uname}", body=msg, level="CRITICAL"),
-        )
+        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:
@@ -315,7 +316,6 @@ 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)
@@ -336,8 +336,7 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         # Apply user-access settings from config
         access = config_mod.get_host_access(cfg, uname)
         host.apply_access(access["owner"], access["managers"], access["monitors"])
-        if verbose:
-            print(("XX: New host, num now %s" % (len(hbdcls.Host.hosts))))
+        logger.info("New host signed on: %s (dyn=%s, access=%s)", uname, host.dyn, access)
         newh = True
     else:
         host = hbdcls.Host.hosts[uname]
@@ -351,8 +350,10 @@ 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": time.time()}
+        if not host.plugin_data:
+            rmsg["request_update"] = 1
         opkt = dicttos("ACK", rmsg)
         try:
             transport.sendto(opkt, addr)
@@ -369,6 +370,14 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
                            if k not in ("ID", "plugin", "id", "name")}
             # Store plugin data with timestamp
             host.add_plugin_data(plugin_name, plugin_data, timestamp=now)
+
+            # 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 = plugin_data.get("owner", config_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}")
             
@@ -408,10 +417,11 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
 
     if res:
         eventlog(uname, "WARNING", res)
-        notify_mod.send_notification(
-            uname,
-            notify_mod.Notification(title=f"[WARNING] {uname}", body=res, level="WARNING"),
-        )
+        if host.watched:
+            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)
@@ -421,10 +431,11 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
 
     if boot:
         eventlog(uname, "INFO", "booted")
-        notify_mod.send_notification(
-            uname,
-            notify_mod.Notification(title=f"[INFO] {uname}", body=f"{host.name} booted", level="INFO"),
-        )
+        if host.watched:
+            asyncio.create_task(notify_mod.send_notification(
+                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)
 
@@ -438,13 +449,18 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         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))
-            eventlog(uname, "RECOVER", m)
-            notify_mod.send_notification(
-                uname,
-                notify_mod.Notification(title=f"[RECOVER] {uname}", body=m, level="RECOVER"),
-            )
+            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
@@ -454,10 +470,11 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
     if shutdown:
         m = "%s shutdown" % conn.afam
         eventlog(uname, "INFO", m)
-        notify_mod.send_notification(
-            uname,
-            notify_mod.Notification(title=f"[INFO] {uname}", body=m, level="INFO"),
-        )
+        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")
 
@@ -491,12 +508,10 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         op, rmsg = host.cmds[0]
         if op == "CMD":
             del host.cmds[0]
-            if log:
-                log(uname, "command sent")
+            eventlog(uname, "INFO", "command sent")
         elif op == "UPD":
             del host.cmds[0]
-            if log:
-                log(uname, "update initiated")
+            eventlog(uname, "INFO", "update initiated")
         opkt = dicttos(op, rmsg)
         try:
             transport.sendto(opkt, addr)

hbd/server/users.py

@@ -146,9 +146,14 @@ def load_users(config: dict) -> dict:
     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 = {}
@@ -166,6 +171,10 @@ def load_users(config: dict) -> dict:
         )
 
     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
 
@@ -187,6 +196,26 @@ def authenticate(username: str, password: str) -> "User | None":
     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
 # ---------------------------------------------------------------------------

hbd/server/ws.py

@@ -13,7 +13,8 @@ from . import data
 
 logger = logging.getLogger(__name__)
 
-_connections: set = 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
 _verbose: bool = False
@@ -34,31 +35,63 @@ def setup(
     _verbose = verbose
 
 
+def _user_can_see_host(user, host_name: str) -> bool:
+    """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)
+
+
+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)
 
-    _connections.add(ws)
+    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 to the new client
+        # Send current host state, filtered to hosts this user may see
         if _get_hosts:
             try:
                 for h in list(_get_hosts()):
-                    await ws.send_str(json.dumps({"type": "host", "data": h}))
+                    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
+        # Send recent messages, filtered to hosts this user may see
         if data.msgs:
             try:
                 for m in data.msgs:
-                    await ws.send_str(json.dumps({"type": "message", "data": m}))
+                    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}))
             except Exception as e:
                 logger.error("Error sending initial messages: %s", e)
 
@@ -74,7 +107,7 @@ async def handler(request):
     except Exception as e:
         logger.exception("WebSocket handler error from %s: %s", remote, e)
     finally:
-        _connections.discard(ws)
+        _connections.pop(ws, None)
         logger.info("WebSocket disconnected from %s", remote)
 
     return ws
@@ -83,25 +116,39 @@ async def handler(request):
 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
+
+    # Determine the host name for access-filtered message types
+    host_name: Optional[str] = None
+    if typ in ("host", "plugin"):
+        host_name = payload.get("raw_name") or payload.get("host") or payload.get("name")
+    elif typ == "message" and isinstance(payload, dict):
+        host_name = payload.get("host")
+
     jmsg = json.dumps({"type": typ, "data": payload})
 
     async def _send_all():
         dead = set()
-        for ws in list(_connections):
+        for ws, user in list(_connections.items()):
             try:
-                if not ws.closed:
-                    await ws.send_str(jmsg)
-                else:
+                if ws.closed:
                     dead.add(ws)
+                    continue
+                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.discard(ws)
+            _connections.pop(ws, None)
 
     asyncio.run_coroutine_threadsafe(_send_all(), _loop)
     return True

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "hbd"
-version = "5.1.2"
+version = "5.2.5"
 description = "Heartbeat monitoring system — client (hbc) and server (hbd)"
 readme = "README.md"
 requires-python = ">=3.11"
@@ -34,6 +34,9 @@ server = [
   "matrix-nio>=0.24",
 ]
 
+# Minimal client — hbc_mini only, no external dependencies
+mini = []
+
 # Install both client and server
 all = [
   "hbd[client,server]",
@@ -54,6 +57,9 @@ 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*"]

scripts/bumpminor.sh

@@ -4,12 +4,14 @@ 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
 
 # commit pyproject.toml
-git commit -m "version $VER" pyproject.toml hbd/__init__.py
+git commit -m "version $VER" pyproject.toml hbd/__init__.py scripts/hbc_mini.py
 git push 
 # tag version
 git tag -a v$VER -m "Version $VER"
 git push --tags
 
 rm hbd/__init__.py.bak
+rm scripts/hbc_mini.py.bak

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/install.sh

@@ -1,88 +0,0 @@
-#!/bin/sh
-
-# install the heartbeat client, hbc. The server is installed when the arg 'server' is passed 
-# 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.
-
-
-# hbd/hbc from wheel and create symlinks for hbd and hbc in ~/bin
-
-set -e
-what=$1
-on_ha=0
-[ -z "$what" ] && what="client"
-
-if [ -d /homeassistant ]; then
-    echo "cannot install in HA, run \"docker exec -it homeassistant $0 $@\""
-    exit 1
-fi
-if [ -d /config ]; then
-    echo "Installing on HA"
-    where="/config/bin"
-    venv="/config/venvs"
-    on_ha=1
-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 $HOME/bin to your PATH"
-        exit 1
-    fi
-    venv="$HOME/venvs"
-fi
-
-echo "Installing heartbeat $what"
-
-if [ ! -d  $venv/hbd ]; then
-    python3 -m pip --version > /dev/null 2>&1 
-    if [ $? -ne 0 ]; then
-        # truenas does 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" &> /dev/null && echo "Installed" || echo "Not Installed")
-    if [ "$have_venv" = "Not Installed" ]; then
-        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
-
-. $venv/hbd/bin/activate
-python3 -mpip install --upgrade --index-url https://git.wrede.ca/api/packages/andreas/pypi/simple/ --extra-index-url https://pypi.org/simple hbd[$what]
-
-if [ "$what" = "server" ]; then
-    rm -f $where/hbd
-    ln -sf $(which hbd) $where/hbd
-    echo "hbd installed, you can run it with \"$where/hbd\" or \"hbd\" if $where is in your PATH"
-else
-    rm -f $where/hbc
-    ln -sf $(which hbc) $where/hbc
-    if [ $on_ha -eq 1 ]; then
-        echo "restarting hbc "
-        job=$(grep run_hbc configuration.yaml | sed 's/run_hbc://')
-        $job
-    else
-        echo "hbc installed, you can run it with \"$where/hbc\" or \"hbc\" if $where is in your PATH"
-    fi  
-fi

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"   Plugins Executed: {data.get('plugin_count')}")
+    print(f"   Data points collected: {len(data)}")
     
     # Show individual plugin results
     print(f"\n5. Individual Plugin Results:")

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_oauth.py

@@ -0,0 +1,324 @@
+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_is_enabled_when_all_keys_present():
+    assert oauth.is_enabled(CFG_ON) is True
+
+
+def test_is_enabled_false_when_no_oauth_key():
+    assert oauth.is_enabled(CFG_OFF) is False
+
+
+def test_is_enabled_false_when_partial_config():
+    assert oauth.is_enabled(CFG_PARTIAL) is False
+
+
+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
+
+
+def test_authorization_url_shape():
+    state = "teststate"
+    redirect_uri = "https://hbd.example.com/login/oauth/gitea/callback"
+    url = oauth.authorization_url(CFG_ON, state, redirect_uri)
+    parsed = urlparse(url)
+    qs = parse_qs(parsed.query)
+    assert parsed.scheme == "https"
+    assert parsed.netloc == "git.example.com"
+    assert parsed.path == "/login/oauth/authorize"
+    assert qs["client_id"] == ["cid"]
+    assert qs["state"] == ["teststate"]
+    assert qs["redirect_uri"] == [redirect_uri]
+    assert qs["scope"] == ["user:email"]
+    assert qs["response_type"] == ["code"]
+
+
+@pytest.mark.asyncio
+async def test_exchange_code_returns_token():
+    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(CFG_ON, "mycode", redirect_uri)
+    assert token == "tok123"
+
+
+@pytest.mark.asyncio
+async def test_exchange_code_raises_on_error_status():
+    redirect_uri = "https://hbd.example.com/login/oauth/gitea/callback"
+    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(CFG_ON, "badcode", redirect_uri)
+
+
+@pytest.mark.asyncio
+async def test_fetch_user_returns_profile():
+    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(CFG_ON, "tok123")
+    assert profile == {
+        "login": "alice",
+        "full_name": "Alice Smith",
+        "avatar_url": "https://git.example.com/avatars/alice.png",
+    }
+
+
+@pytest.mark.asyncio
+async def test_exchange_code_raises_when_no_access_token():
+    redirect_uri = "https://hbd.example.com/login/oauth/gitea/callback"
+    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(CFG_ON, "mycode", redirect_uri)
+
+
+@pytest.mark.asyncio
+async def test_fetch_user_raises_on_error_status():
+    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(CFG_ON, "tok123")
+
+
+# ---------------------------------------------------------------------------
+# 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."""
+    redirect_uri = "https://hbd.example.com/login/oauth/gitea/callback"
+
+    # Step 1: create a state token
+    state = oauth.make_state()
+    assert oauth.validate_state(state) is True  # consumed; replay would return False
+
+    # Step 2: exchange code → token (mocked)
+    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(CFG_ON, "authcode", redirect_uri)
+        profile = await oauth.fetch_user(CFG_ON, token)
+
+    assert token == "flow_token"
+    assert profile["login"] == "flowuser"
+
+    # Step 3: provision user
+    _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

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)