feat(argocd-applicationset): Add resources metrics-service and servicemonitor. (#1041)

* [argocd-applicationset]: Add metrics-service and servicemonitor to applicationset.

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* [argocd-applicationset]: Add ci values for servicemonitor.

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* format indent

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* update helm docs

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* update ci values

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* update ci values

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* chore: Use consistent indents and file ending

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

* Also disable mounts of ArgoCD during metrics test

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

Co-authored-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

charts/argocd-applicationset/templates/servicemonitor.yaml

@@ -0,0 +1,38 @@
+{{- if and .Values.metrics.enabled .Values.metrics.serviceMonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ template "argo-applicationset.fullname" . }}
+  {{- if .Values.metrics.serviceMonitor.namespace }}
+  namespace: {{ .Values.metrics.serviceMonitor.namespace }}
+  {{- end }}
+  labels:
+    {{- include "argo-applicationset.labels" . | nindent 4 }}
+    {{- with .Values.metrics.serviceMonitor.selector }}
+      {{- toYaml . | nindent 4 }}
+    {{- end }}
+    {{- with .Values.metrics.serviceMonitor.additionalLabels }}
+      {{- toYaml . | nindent 4 }}
+    {{- end }}
+spec:
+  endpoints:
+    - port: metrics
+      {{- with .Values.metrics.serviceMonitor.interval }}
+      interval: {{ . }}
+      {{- end }}
+      path: /metrics
+      {{- with .Values.metrics.serviceMonitor.relabelings }}
+      relabelings:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.metrics.serviceMonitor.metricRelabelings }}
+      metricRelabelings:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+  namespaceSelector:
+    matchNames:
+      - {{ .Release.Namespace }}
+  selector:
+    matchLabels:
+      {{- include "argo-applicationset.selectorLabels" . | nindent 6 }}
+{{- end }}