feat: Add support for metrics in chart

charts/mercure/templates/deployment.yaml

@@ -101,6 +101,11 @@ spec:
             - name: http
               containerPort: {{ .Values.service.targetPort }}
               protocol: TCP
+            {{- if .Values.metrics.enabled }}
+            - name: metrics
+              containerPort: {{ .Values.metrics.port }}
+              protocol: TCP
+            {{- end }}
           livenessProbe:
             httpGet:
               path: /healthz

charts/mercure/templates/service.yaml

@@ -18,3 +18,27 @@ spec:
       name: http
   selector:
     {{- include "mercure.selectorLabels" . | nindent 4 }}
+---
+{{- if .Values.metrics.enabled }}
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "mercure.fullname" . }}-metrics
+  labels:
+    {{- include "mercure.labels" . | nindent 4 }}
+    prometheus-operated: true
+  {{- with .Values.service.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+
+spec:
+  type: ClusterIP
+  ports:
+    - port: {{ .Values.metrics.port }}
+      targetPort: metrics
+      protocol: TCP
+      name: metrics
+  selector:
+    {{- include "mercure.selectorLabels" . | nindent 4 }}
+{{- end }}

charts/mercure/templates/serviceMonitor.yaml

@@ -0,0 +1,15 @@
+{{- if and .Values.metrics.enabled .Values.metrics.serviceMonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ include "mercure.fullname" . }}-metrics
+  labels:
+    app.kubernetes.io/name: {{ include "mercure.name" . }}
+spec:
+  selector:
+    matchLabels:
+      prometheus-operated: "true"
+  endpoints:
+    - port: metrics
+      interval: {{ .Values.metrics.interval }}
+{{- end }}

charts/mercure/values.yaml

@@ -28,6 +28,22 @@ subscriberJwtAlg: HS256
 # -- The license key for [the High Availability version](https://mercure.rocks/docs/hub/cluster) (not necessary is you use the FOSS version).
 license: ""
 
+metrics:
+  # -- Enable the metrics. You must also add the [metrics](https://caddyserver.com/docs/caddyfile/directives/metrics) in the `globalOptions` for Caddy server.
+  # servers {
+  #     metrics
+  # }
+  # admin :9181
+  enabled: false
+  # -- The port to use for exposing the metrics.
+  port: 9181
+
+  serviceMonitor:
+    # -- Whether to create a ServiceMonitor for Prometheus Operator.
+    enabled: false
+    # -- The interval to use for the ServiceMonitor to scrape the metrics.
+    interval: 15s
+
 # -- The number of replicas (pods) to launch, must be 1 unless you are using [the High Availability version](https://mercure.rocks/docs/hub/cluster).
 replicaCount: 1