add HelmRelease and HelmRepository for Prometheus

clusters/default/helm/prometheus/prometheus-release.yml

@@ -0,0 +1,28 @@
+---
+apiVersion: helm.toolkit.fluxcd.io/v2
+kind: HelmRelease
+metadata:
+  name: prometheus
+  namespace: monitoring
+spec:
+  interval: 24h
+  chart:
+    spec:
+      chart: prometheus
+      version: "27.40.1"
+      sourceRef:
+        kind: HelmRepository
+        name: prometheus-community
+        namespace: flux-system
+      interval: 24h
+  install:
+    remediation:
+      retries: 3
+  upgrade:
+    remediation:
+      retries: 3
+  values:
+    service:
+      enabled: true
+      type: LoadBalancer
+      servicePort: 9090

clusters/default/helm/prometheus/prometheus-repo.yml

@@ -0,0 +1,9 @@
+---
+apiVersion: source.toolkit.fluxcd.io/v1
+kind: HelmRepository
+metadata:
+  name: prometheus-community
+  namespace: flux-system
+spec:
+  interval: 24h
+  url: https://prometheus-community.github.io/helm-charts