Commit e7fb878ba284

@@ -437,5 +437,59 @@
         # Placeholder for tarsnap, restic, rsync backup monitoring
       ];
     }
+
+    {
+      name = "systemd_alerts";
+      interval = "30s";
+      rules = [
+        # Critical systemd service failures
+        {
+          alert = "SystemdServiceFailed";
+          expr = ''
+            node_systemd_unit_state{name=~"(prosody|jellyfin|audiobookshelf|navidrome|lidarr|sonarr|radarr|prowlarr|bazarr|traefik|grafana|prometheus|alertmanager|n8n|paperless|postgresql).service",state="failed"} == 1
+          '';
+          for = "1m";
+          labels = {
+            severity = "critical";
+          };
+          annotations = {
+            summary = "Systemd service failed on {{ $labels.instance }}";
+            description = "Service {{ $labels.name }} on {{ $labels.instance }} is in failed state - check logs with: journalctl -u {{ $labels.name }}";
+          };
+        }
+
+        # Service unexpectedly inactive (should be running but isn't)
+        {
+          alert = "SystemdServiceInactive";
+          expr = ''
+            node_systemd_unit_state{name=~"(prosody|jellyfin|audiobookshelf|navidrome|lidarr|sonarr|radarr|prowlarr|bazarr|traefik|grafana|prometheus|alertmanager|n8n|paperless|postgresql).service",state="inactive"} == 1
+          '';
+          for = "5m";
+          labels = {
+            severity = "warning";
+          };
+          annotations = {
+            summary = "Systemd service inactive on {{ $labels.instance }}";
+            description = "Service {{ $labels.name }} on {{ $labels.instance }} has been inactive for 5 minutes - may need restart";
+          };
+        }
+
+        # Service restarting frequently (potential crash loop)
+        {
+          alert = "SystemdServiceRestartingFrequently";
+          expr = ''
+            rate(node_systemd_unit_state{name=~"(prosody|jellyfin|audiobookshelf|navidrome|lidarr|sonarr|radarr|prowlarr|bazarr|traefik|grafana|prometheus|alertmanager|n8n|paperless|postgresql).service",state="activating"}[5m]) > 0.1
+          '';
+          for = "3m";
+          labels = {
+            severity = "warning";
+          };
+          annotations = {
+            summary = "Systemd service restarting frequently on {{ $labels.instance }}";
+            description = "Service {{ $labels.name }} on {{ $labels.instance }} is restarting frequently - possible crash loop";
+          };
+        }
+      ];
+    }
   ];
 }