Enable ArgoCD metrics for Prometheus/Grafana monitoring

manifests/argocd/values.yaml

@@ -61,6 +61,12 @@ server:
       - argocd.dvirlabs.com
   service:
     type: ClusterIP
+  metrics:
+    enabled: true
+    serviceMonitor:
+      enabled: true
+      interval: 30s
+      namespace: observability-stack
 
 controller:
   replicas: 2
@@ -70,6 +76,40 @@ controller:
     requests:
       cpu: 200m
       memory: 1Gi
+  metrics:
+    enabled: true
+    serviceMonitor:
+      enabled: true
+      interval: 30s
+      namespace: observability-stack
+    rules:
+      enabled: true
+      namespace: observability-stack
+      spec:
+        - alert: ArgoAppMissing
+          expr: |
+            absent(argocd_app_info) == 1
+          for: 15m
+          labels:
+            severity: critical
+          annotations:
+            summary: "[Argo CD] No reported applications"
+            description: >
+              Argo CD has not reported any applications data for the past 15 minutes which
+              means that it must be down or not functioning properly. This needs to be
+              resolved for this cloud to continue to maintain state.
+        - alert: ArgoAppNotSynced
+          expr: |
+            argocd_app_info{sync_status!="Synced"} == 1
+          for: 12h
+          labels:
+            severity: warning
+          annotations:
+            summary: "[{{$labels.name}}] Application not synchronized"
+            description: >
+              The application [{{$labels.name}}] has not been synchronized for over
+              12 hours which means that the state of this cloud has drifted away from the
+              state inside Git.
 
 repoServer:
   resources:
@@ -78,4 +118,26 @@ repoServer:
     requests:
       cpu: 100m
       memory: 256Mi
+  metrics:
+    enabled: true
+    serviceMonitor:
+      enabled: true
+      interval: 30s
+      namespace: observability-stack
+
+applicationSet:
+  metrics:
+    enabled: true
+    serviceMonitor:
+      enabled: true
+      interval: 30s
+      namespace: observability-stack
+
+notifications:
+  metrics:
+    enabled: true
+    serviceMonitor:
+      enabled: true
+      interval: 30s
+      namespace: observability-stack