refactor: reorganize kustomizations

cluster/core/flux-system/monitoring/source-controller/kustomization.yaml

@@ -0,0 +1,4 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- podmonitor.yaml

cluster/core/flux-system/monitoring/source-controller/podmonitor.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: monitoring.coreos.com/v1
+kind: PodMonitor
+metadata:
+  name: source-controller
+  namespace: flux-system
+  labels:
+    app.kubernetes.io/instance: flux-system
+    app.kubernetes.io/version: latest
+spec:
+  namespaceSelector:
+    matchNames:
+    - flux-system
+  selector:
+    matchLabels:
+      app: source-controller
+  podMetricsEndpoints:
+  - port: http-prom