Use kube-prometheus-stack for monitoring

Signed-off-by: Somtochi Onyekwere <somtochionyekwere@gmail.com>

manifests/monitoring/monitoring-config/kustomization.yaml

@@ -0,0 +1,13 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: flux-system
+resources:
+  - podmonitor.yaml
+configMapGenerator:
+  - name: flux-grafana-dashboards
+    files:
+      - ../grafana/dashboards/control-plane.json
+      - ../grafana/dashboards/cluster.json
+    options:
+      labels:
+        grafana_dashboard: flux-system

manifests/monitoring/monitoring-config/podmonitor.yaml

@@ -0,0 +1,24 @@
+apiVersion: monitoring.coreos.com/v1
+kind: PodMonitor
+metadata:
+  name: flux-system
+  namespace: flux-system
+  labels:
+    app.kubernetes.io/part-of: flux
+spec:
+  namespaceSelector:
+    matchNames:
+      - flux-system
+  selector:
+    matchExpressions:
+      - key: app
+        operator: In
+        values:
+          - helm-controller
+          - source-controller
+          - kustomize-controller
+          - notification-controller
+          - image-automation-controller
+          - image-reflector-controller
+  podMetricsEndpoints:
+    - targetPort: http-prom