fix: clear all mypy errors

Annotate untyped containers and Optional attributes, type the stdlib-shaped
metric dicts in the client plugins, and add types-PyYAML/types-psutil to the
dev extras plus a mypy override for nio/mattermostdriver (no stubs).

Behaviour fixes found on the way: enable_kernel_timestamps() now returns False
when SO_TIMESTAMP is unknown instead of raising TypeError, send_shutdown is
defined at module level so cleanup() cannot hit a NameError, and a failed
subprocess returncode falls back to UNKNOWN.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

hbd/server/config.py

@@ -7,7 +7,7 @@ import os
 try:
     import yaml
 except Exception:
-    yaml = None
+    yaml = None  # type: ignore[assignment]
 
 SERVER_DEFAULTS = {
     # Network settings

hbd/server/data.py

@@ -1,4 +1,4 @@
-msgs = []  # in-memory list of recent messages for new websocket clients; also logged to file via notify.eventlog
+msgs: list = []  # in-memory list of recent messages for new websocket clients; also logged to file via notify.eventlog
 
 
 class Data:

hbd/server/dns.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 from subprocess import Popen, PIPE, STDOUT
-from typing import Optional
+from typing import Any, Callable, Optional
 import asyncio
 import logging
 
@@ -79,8 +79,8 @@ async def dns_update_worker(
     hbdclass,
     cfg: dict,
     async_queue=None,
-    log: Optional[callable] = None,
-    pushmsg: Optional[callable] = None,
+    log: Optional[Callable[..., Any]] = None,
+    pushmsg: Optional[Callable[..., Any]] = None,
     loop: Optional[asyncio.AbstractEventLoop] = None,
 ):
     """Pure async DNS worker that processes updates from asyncio.Queue.
@@ -164,7 +164,7 @@ async def dns_update_worker(
 def start_dns_worker(
     hbdclass,
     cfg: dict,
-    log: Optional[callable] = None,
+    log: Optional[Callable[..., Any]] = None,
     loop: Optional[asyncio.AbstractEventLoop] = None,
 ):
     """Start the async DNS worker and return the Task.
@@ -176,7 +176,7 @@ def start_dns_worker(
         loop = asyncio.get_event_loop()
 
     # Create asyncio.Queue and wrap in a bridge for thread-safe puts
-    async_q = asyncio.Queue()
+    async_q: asyncio.Queue[Any] = asyncio.Queue()
 
     class _QueueBridge:
         """Thread-safe wrapper around asyncio.Queue for synchronous callers."""

hbd/server/hbdclass.py

@@ -8,6 +8,7 @@ import time
 import json
 import copy
 import queue
+from typing import Any, Dict
 
 num = 0
 
@@ -24,7 +25,7 @@ def log(host, m):
 class Connection:
     # map of addrs to names
 
-    htab = {}
+    htab: Dict[str, Any] = {}
     UNKNOWN = "unknown"
     UP = "up"
     DOWN = "down"
@@ -278,8 +279,8 @@ class Connection:
 #
 class Host:
     # Table of Hosts
-    hosts = {}
-    dnsQ = queue.Queue()
+    hosts: Dict[str, "Host"] = {}
+    dnsQ: "queue.Queue[Any]" = queue.Queue()
 
     def __init__(self, name):
         global num

hbd/server/journal.py

@@ -11,7 +11,7 @@ import os
 import asyncio
 from datetime import datetime
 from pathlib import Path
-from typing import Dict, Any, Optional, Callable, Iterable, List, Tuple, Union
+from typing import Dict, Any, Optional, Callable, Iterable, List, TextIO, Tuple, Union
 
 logger = logging.getLogger(__name__)
 
@@ -52,7 +52,7 @@ class MessageJournal:
         self.enabled = self.config.get('journal_enabled', True)
 
         # Runtime state
-        self._file_handle = None
+        self._file_handle: Optional[TextIO] = None
         self._current_size = 0
         self._lock = asyncio.Lock()
         self._initialized = False

hbd/server/oauth.py

@@ -128,7 +128,7 @@ def get_providers(config: dict) -> list[ResolvedProvider]:
     Entries with missing required fields or unknown types are skipped with
     a warning log.  Order follows config declaration order.
     """
-    result = []
+    result: list = []
     oauth_cfg = config.get("oauth", {})
     if not isinstance(oauth_cfg, dict):
         return result

hbd/server/threshold.py

@@ -53,16 +53,16 @@ class AlertState:
         self.metric_path = metric_path
         self.level = AlertLevel.OK
         self.since = time.time()
-        self.last_value = None
+        self.last_value: Any = None
         self.last_check = time.time()
         self.notification_count = 0
-        self.last_notification = None
-        self.threshold_value = None  # The threshold value that triggered alert
-        self.operator = None  # The comparison operator (>, <, >=, etc.)
+        self.last_notification: Optional[float] = None
+        self.threshold_value: Optional[float] = None  # The threshold value that triggered alert
+        self.operator: Optional[str] = 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.formatted_message: Optional[str] = None  # Formatted display message for UI
         self.acknowledged = False  # Whether alert has been acknowledged
-        self.acknowledged_at = None  # Timestamp when acknowledged
+        self.acknowledged_at: Optional[float] = None  # Timestamp when acknowledged
         self.consecutive_count = 0  # Consecutive exceedances while still OK (for count gating)
         self.pending_since: Optional[float] = None  # non-None while waiting out grace period before notifying
 
@@ -362,13 +362,13 @@ class ThresholdChecker:
             journal: Optional MessageJournal instance for logging threshold events
         """
         # Named threshold configurations (pre-merged: defaults + overrides): {config_name: {metric_path: ThresholdConfig}}
-        self.threshold_configs = {}
+        self.threshold_configs: Dict[str, Dict[str, ThresholdConfig]] = {}
 
         # 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 = {}
+        self.thresholds: Dict[str, ThresholdConfig] = {}
 
         # Host to ordered list of config names: {host_name: [config_name, ...]}
         self.host_config_mapping: Dict[str, List[str]] = {}
@@ -1276,7 +1276,7 @@ class ThresholdChecker:
 
     def _format_display(
         self,
-        display_format: str,
+        display_format: Optional[str],
         value: Any,
         threshold_value: Optional[float],
         op_symbol: str,

hbd/server/udp.py

@@ -5,6 +5,7 @@ import socket
 import struct
 import time
 import zlib
+from typing import Optional
 import logging
 
 from platform import system as platform_system
@@ -25,6 +26,7 @@ _STALE_INTERVAL_MULTIPLIER = 3
 # Supported on Linux, FreeBSD, and macOS.  The constant is not exposed by
 # Python's socket module on all platforms
 platform = platform_system()
+_SO_TIMESTAMP: Optional[int]
 if platform == "Darwin":
     _SO_TIMESTAMP = 1024  # SO_TIMESTAMP on macOS (not in Python's socket module)
 elif platform == "Linux":
@@ -45,6 +47,8 @@ def enable_kernel_timestamps(sock) -> bool:
     Returns True if the kernel will supply receive timestamps, False otherwise
     (unsupported platform, older kernel, or insufficient permissions).
     """
+    if _SO_TIMESTAMP is None:
+        return False
     try:
         sock.setsockopt(socket.SOL_SOCKET, _SO_TIMESTAMP, 1)
         return True
@@ -430,7 +434,7 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         return
 
     cfg = ctx.get("config", {})
-    hbdcls = ctx.get("hbdclass")
+    hbdcls = ctx["hbdclass"]
     msg_to_websockets = ctx.get("msg_to_websockets")
     DEBUG = ctx.get("DEBUG", 0)
 
@@ -459,10 +463,8 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         newh = False
 
     cid = msg.get("id", 0)
-    try:
-        rtt = float(msg.get("rtt"))
-    except TypeError:
-        rtt = None
+    rtt_raw = msg.get("rtt")
+    rtt = float(rtt_raw) if rtt_raw is not None else None
 
     if msg.get("ID") == "HTB":
         host.doesack = msg.get("acks", -1)