Revert "remove grafana"

This reverts commit 1c6ac6014a.

bootstrap/helmrepositories/helmrepository-prometheus-community.yaml

@@ -0,0 +1,8 @@
+apiVersion: source.toolkit.fluxcd.io/v1beta2
+kind: HelmRepository
+metadata:
+  name: prometheus-community
+  namespace: flux-system
+spec:
+  interval: 15m
+  url: https://prometheus-community.github.io/helm-charts

bootstrap/kustomizations/kustomization-monitoring.yaml

@@ -0,0 +1,18 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: monitoring
+  namespace: flux-system
+spec:
+  interval: 15m
+  path: ./monitoring
+  prune: true # remove any elements later removed from the above path
+  timeout: 2m # if not set, this defaults to interval duration, which is 1h
+  sourceRef:
+    kind: GitRepository
+    name: flux-system
+  healthChecks:
+    - apiVersion: helm.toolkit.fluxcd.io/v2beta1
+      kind: HelmRelease
+      name: monitoring
+      namespace: monitoring

bootstrap/namespaces/namespace-monitoring.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: monitoring