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/client/plugins/cpu_monitor.py

@@ -28,7 +28,7 @@ class CPUMonitorPlugin(MonitorPlugin):
 
     def __init__(self, config: Optional[Dict[str, Any]] = None):
         super().__init__(config)
-        self.psutil = None
+        self.psutil: Any = None
         self.per_core = config.get("per_core", False) if config else False
         self.interval = config.get("interval", 300) if config else 300
 

hbd/client/plugins/disk_monitor.py

@@ -10,7 +10,7 @@ from typing import Dict, Any, Optional
 try:
     import psutil
 except ImportError:
-    psutil = None
+    psutil = None  # type: ignore[assignment]
 
 from hbd.client.plugin import MonitorPlugin
 
@@ -58,7 +58,7 @@ class DiskMonitorPlugin(MonitorPlugin):
             raise ImportError("psutil library is required for disk_monitor plugin")
 
         # Store previous I/O counters for delta calculation
-        self._prev_io = {}
+        self._prev_io: Dict[str, Any] = {}
 
     async def initialize(self):
         """Initialize the plugin (check psutil availability)."""
@@ -114,7 +114,7 @@ class DiskMonitorPlugin(MonitorPlugin):
 
     async def _collect_metrics(self) -> Dict[str, Any]:
         """Collect disk metrics from psutil."""
-        metrics = {}
+        metrics: Dict[str, Any] = {}
 
         # Collect partition usage
         partitions_data = {}

hbd/client/plugins/filesystem_info.py

@@ -10,7 +10,7 @@ from typing import Dict, Any, Optional
 try:
     import psutil
 except ImportError:
-    psutil = None
+    psutil = None  # type: ignore[assignment]
 
 from hbd.client.plugin import InfoPlugin
 
@@ -98,8 +98,8 @@ class FilesystemInfoPlugin(InfoPlugin):
 
     async def _collect_info(self) -> Dict[str, Any]:
         """Collect filesystem information from psutil."""
-        info = {}
-        filesystems = []
+        info: Dict[str, Any] = {}
+        filesystems: list = []
         filesystem_types = set()
 
         # Get mounted disk partitions
@@ -112,7 +112,7 @@ class FilesystemInfoPlugin(InfoPlugin):
             if partition.fstype in self.exclude_types:
                 continue
 
-            fs_info = {
+            fs_info: Dict[str, Any] = {
                 'device': partition.device,
                 'mountpoint': partition.mountpoint,
                 'fstype': partition.fstype,

hbd/client/plugins/memory_monitor.py

@@ -10,7 +10,7 @@ from typing import Dict, Any, Optional
 try:
     import psutil
 except ImportError:
-    psutil = None
+    psutil = None  # type: ignore[assignment]
 
 from hbd.client.plugin import MonitorPlugin
 
@@ -116,7 +116,7 @@ class MemoryMonitorPlugin(MonitorPlugin):
 
     async def _collect_metrics(self) -> Dict[str, Any]:
         """Collect memory metrics from psutil."""
-        metrics = {}
+        metrics: Dict[str, Any] = {}
 
         # Virtual (physical) memory statistics
         vmem = psutil.virtual_memory()

hbd/client/plugins/nagios_runner.py

@@ -124,7 +124,7 @@ class NagiosRunnerPlugin(MonitorPlugin):
         Returns:
             Dictionary with results from all plugins
         """
-        results = {}
+        results: Dict[str, Any] = {}
 
         for cmd_config in self.commands:
             name = cmd_config.get("name")
@@ -181,7 +181,8 @@ class NagiosRunnerPlugin(MonitorPlugin):
                 self.logger.error(f"Command timed out: {command}")
                 return NAGIOS_UNKNOWN, f"Command timed out after {self.timeout}s", {}
 
-            status_code = proc.returncode
+            # communicate() has finished, so the process has exited and returncode is set
+            status_code = proc.returncode if proc.returncode is not None else NAGIOS_UNKNOWN
 
             if status_code < 0:
                 return NAGIOS_UNKNOWN, f"Process killed by signal {-status_code}", {}
@@ -225,7 +226,7 @@ class NagiosRunnerPlugin(MonitorPlugin):
         Returns:
             Dictionary of metric_name: value
         """
-        perfdata = {}
+        perfdata: Dict[str, Any] = {}
 
         # Performance data comes after the pipe character
         if '|' not in output:

hbd/client/plugins/network_monitor.py

@@ -10,7 +10,7 @@ from typing import Dict, Any, Optional
 try:
     import psutil
 except ImportError:
-    psutil = None
+    psutil = None  # type: ignore[assignment]
 
 from hbd.client.plugin import MonitorPlugin
 from hbd.client.connectivity import get_shared
@@ -63,7 +63,7 @@ class NetworkMonitorPlugin(MonitorPlugin):
             raise ImportError("psutil library is required for network_monitor plugin")
 
         # Store previous I/O counters for delta calculation
-        self._prev_io = {}
+        self._prev_io: Dict[str, Any] = {}
 
     async def initialize(self):
         """Initialize the plugin (check psutil availability)."""
@@ -124,7 +124,7 @@ class NetworkMonitorPlugin(MonitorPlugin):
 
     async def _collect_metrics(self) -> Dict[str, Any]:
         """Collect network metrics from psutil."""
-        metrics = {}
+        metrics: Dict[str, Any] = {}
 
         # Collect per-interface I/O counters
         try:
@@ -169,7 +169,7 @@ class NetworkMonitorPlugin(MonitorPlugin):
         if self.include_connections:
             try:
                 connections = psutil.net_connections(kind='inet')
-                conn_stats = {}
+                conn_stats: Dict[str, int] = {}
 
                 # Count connections by state
                 for conn in connections:

hbd/client/plugins/ping_monitor.py

@@ -67,6 +67,7 @@ class PingMonitorPlugin(MonitorPlugin):
         self.timeout = int(cfg.get("timeout", 5))
         # hosts: dict of {hostname: {warning: x, critical: y}} or list of hostnames
         raw_hosts = cfg.get("hosts", {})
+        self.hosts: Dict[str, Any]
         if isinstance(raw_hosts, list):
             self.hosts = {h: {} for h in raw_hosts}
         else: