Migrate deployment of monitoring stack to flux

clusters/prow-build/kustomization.yaml

@@ -5,3 +5,4 @@ resources:
 - flux-system
 - ../base
 - coredns-kustomization.yaml
+- monitoring-build-kustomization.yaml

clusters/prow-build/monitoring-build-kustomization.yaml

@@ -0,0 +1,15 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: monitoring-build
+  namespace: flux-system
+spec:
+  interval: 30m
+  path: deploy/monitoring/build
+  prune: true
+  retryInterval: 2m
+  sourceRef:
+    kind: GitRepository
+    name: ci-infra
+  timeout: 10m
+  wait: true

clusters/prow-trusted/kustomization.yaml

@@ -7,3 +7,4 @@ resources:
 - prow-kustomization.yaml
 - oauth2-proxy-kustomization.yaml
 - renovate-kustomization.yaml
+- monitoring-trusted-kustomization.yaml

clusters/prow-trusted/monitoring-trusted-kustomization.yaml

@@ -0,0 +1,15 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: monitoring-trusted
+  namespace: flux-system
+spec:
+  interval: 30m
+  path: deploy/monitoring/trusted
+  prune: true
+  retryInterval: 2m
+  sourceRef:
+    kind: GitRepository
+    name: ci-infra
+  timeout: 10m
+  wait: true

deploy/monitoring/base/alertmanager-vpa.yaml

@@ -0,0 +1,18 @@
+apiVersion: autoscaling.k8s.io/v1
+kind: VerticalPodAutoscaler
+metadata:
+  labels:
+    app.kubernetes.io/name: alertmanager
+  name: alertmanager-prometheus
+  namespace: monitoring
+spec:
+  resourcePolicy:
+    containerPolicies:
+    - containerName: '*'
+      controlledValues: RequestsOnly
+  targetRef:
+    apiVersion: monitoring.coreos.com/v1
+    kind: Alertmanager
+    name: prometheus
+  updatePolicy:
+    updateMode: Auto

deploy/monitoring/base/grafana-vpa.yaml

@@ -0,0 +1,18 @@
+apiVersion: autoscaling.k8s.io/v1
+kind: VerticalPodAutoscaler
+metadata:
+  labels:
+    app.kubernetes.io/name: grafana
+  name: grafana
+  namespace: monitoring
+spec:
+  resourcePolicy:
+    containerPolicies:
+    - containerName: '*'
+      controlledValues: RequestsOnly
+  targetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: grafana
+  updatePolicy:
+    updateMode: Auto