feat(observability): add prometheus operator servicemonitor to the helm charts

.github/workflows/helm-test.yml

@@ -55,3 +55,10 @@ jobs:
         run: |
           helm template ${{ matrix.chart }} deploy/helm/${{ matrix.chart }} --set image.tag=test \
             | kubeconform -strict -summary -kubernetes-version "$KUBERNETES_VERSION"
+
+      - name: Validate the ServiceMonitor renders (operator CRD skipped)
+        run: |
+          rendered=$(helm template ${{ matrix.chart }} deploy/helm/${{ matrix.chart }} \
+            --set image.tag=test --set serviceMonitor.enabled=true)
+          echo "$rendered" | grep -q 'kind: ServiceMonitor'
+          echo "$rendered" | kubeconform -strict -summary -skip ServiceMonitor -kubernetes-version "$KUBERNETES_VERSION"

deploy/helm/ledger/templates/servicemonitor.yaml

@@ -0,0 +1,16 @@
+{{- if .Values.serviceMonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ include "ledger.fullname" . }}
+  labels:
+    {{- include "ledger.labels" . | nindent 4 }}
+spec:
+  selector:
+    matchLabels:
+      {{- include "ledger.selectorLabels" . | nindent 6 }}
+  endpoints:
+    - port: http
+      path: {{ .Values.serviceMonitor.path }}
+      interval: {{ .Values.serviceMonitor.interval }}
+{{- end }}

deploy/helm/ledger/values.yaml

@@ -19,6 +19,12 @@ service:
   type: ClusterIP
   port: 8080
 
+# Prometheus Operator ServiceMonitor. Off by default; enable on a cluster running the operator.
+serviceMonitor:
+  enabled: false
+  interval: 30s
+  path: /actuator/prometheus
+
 resources:
   requests:
     cpu: 250m

deploy/helm/payments/templates/servicemonitor.yaml

@@ -0,0 +1,16 @@
+{{- if .Values.serviceMonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ include "payments.fullname" . }}
+  labels:
+    {{- include "payments.labels" . | nindent 4 }}
+spec:
+  selector:
+    matchLabels:
+      {{- include "payments.selectorLabels" . | nindent 6 }}
+  endpoints:
+    - port: http
+      path: {{ .Values.serviceMonitor.path }}
+      interval: {{ .Values.serviceMonitor.interval }}
+{{- end }}

deploy/helm/payments/values.yaml

@@ -19,6 +19,12 @@ service:
   type: ClusterIP
   port: 8080
 
+# Prometheus Operator ServiceMonitor. Off by default; enable on a cluster running the operator.
+serviceMonitor:
+  enabled: false
+  interval: 30s
+  path: /actuator/prometheus
+
 resources:
   requests:
     cpu: 250m