feat: add typed qBittorrent scheduled polling

backend/src/media_library_viewer_api/observability.py

@@ -77,6 +77,28 @@ MAIL_QUEUE_SIZE = Counter(
     ["status"],
 )
 
+SCHEDULED_ACTIONS_TOTAL = Counter(
+    "manage_scheduled_actions_total",
+    "Total typed scheduled action attempts",
+    ["service_id", "action", "status"],
+)
+SCHEDULED_ACTION_DURATION = Histogram(
+    "manage_scheduled_action_duration_seconds",
+    "Typed scheduled action duration",
+    ["action"],
+    buckets=(0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, 30.0, 60.0),
+)
+SCHEDULED_ACTION_LAST_SUCCESS = Gauge(
+    "manage_scheduled_action_last_success_timestamp",
+    "Unix timestamp of the last successful typed scheduled action",
+    ["service_id", "action"],
+)
+SCHEDULED_ACTION_FAILURES = Gauge(
+    "manage_scheduled_action_consecutive_failures",
+    "Current consecutive failure count for a typed scheduled action",
+    ["service_id", "action"],
+)
+
 
 def set_current_request_id(request_id: str | None) -> None:
     """Set the context-local request id."""
@@ -147,6 +169,25 @@ def record_mail_queue(status: str) -> None:
     MAIL_QUEUE_SIZE.labels(status=status).inc()
 
 
+def record_scheduled_action(
+    service_id: str,
+    action: str,
+    status: str,
+    duration_seconds: float | None = None,
+    success: bool = False,
+    consecutive_failures: int = 0,
+) -> None:
+    """Record secret-safe metrics for a typed scheduled action."""
+    safe_service = service_id or "unknown"
+    safe_action = action or "unknown"
+    SCHEDULED_ACTIONS_TOTAL.labels(service_id=safe_service, action=safe_action, status=status).inc()
+    SCHEDULED_ACTION_FAILURES.labels(service_id=safe_service, action=safe_action).set(consecutive_failures)
+    if duration_seconds is not None:
+        SCHEDULED_ACTION_DURATION.labels(action=safe_action).observe(duration_seconds)
+    if success:
+        SCHEDULED_ACTION_LAST_SUCCESS.labels(service_id=safe_service, action=safe_action).set_to_current_time()
+
+
 def log_extra(request: Request | None = None, **kwargs: Any) -> dict[str, Any]:
     """Build a standard extra dict for structured logging."""
     extra: dict[str, Any] = {"request_id": get_request_id(request)}