feat(metrics): collect Headscale, NetBird, Gitea and Immich metrics

gitea/k8s/config.yaml

@@ -20,6 +20,8 @@ data:
 
   GITEA__mailer__ENABLED: "false"
 
+  GITEA__metrics__ENABLED: "true"
+
   # No code/issue search needed: bleve reindexes the whole issue index on
   # every pod restart (cron.rebuild_issue_indexer RUN_AT_START) and hammers
   # the rotational disk for an hour. "db" serves issue search from postgres.

gitea/k8s/gitea.yaml

@@ -3,6 +3,8 @@ kind: Service
 metadata:
   name: gitea-service
   namespace: gitea
+  labels:
+    app: gitea
 spec:
   selector:
     app: gitea

gitea/k8s/ingress.yaml

@@ -7,7 +7,8 @@ spec:
   entryPoints:
     - websecure
   routes:
-    - match: Host(`gitea.forust.xyz`) || Host(`git.forust.xyz`)
+    # Metrics are scraped directly through the cluster Service.
+    - match: (Host(`gitea.forust.xyz`) || Host(`git.forust.xyz`)) && !PathPrefix(`/metrics`)
       kind: Rule
       services:
         - name: gitea-service

gitea/k8s/servicemonitor.yaml

@@ -0,0 +1,16 @@
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: gitea
+  namespace: gitea
+  labels:
+    release: prometheus-stack
+spec:
+  selector:
+    matchLabels:
+      app: gitea
+  endpoints:
+    - port: http
+      path: /metrics
+      interval: 30s
+      scrapeTimeout: 10s