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

headscale/config/headscale.yaml.example

@@ -7,7 +7,7 @@
 # # Dev server_url
 # server_url: https://hs.dev_internal_domain.internal
 listen_addr: 0.0.0.0:8080
-metrics_listen_addr: 127.0.0.1:9090
+metrics_listen_addr: 0.0.0.0:9090
 grpc_listen_addr: 127.0.0.1:50443
 grpc_allow_insecure: false
 noise:

headscale/k8s/routing/external-service.yaml

@@ -3,6 +3,8 @@ kind: Service
 metadata:
   name: headscale-server-external
   namespace: headscale
+  labels:
+    app: headscale
 spec:
   ports:
     - port: 8080

headscale/k8s/vmservicescrape.yaml

@@ -0,0 +1,18 @@
+apiVersion: operator.victoriametrics.com/v1beta1
+kind: VMServiceScrape
+metadata:
+  name: headscale
+  namespace: headscale
+  labels:
+    release: prometheus-stack
+spec:
+  # The external Service has a manually managed EndpointSlice, not Endpoints.
+  discoveryRole: endpointslice
+  selector:
+    matchLabels:
+      app: headscale
+  endpoints:
+    - port: metrics
+      path: /metrics
+      interval: 30s
+      scrapeTimeout: 10s