Totally revamp cluster chart configs

charts/prometheus/app-servicemonitor.yaml

@@ -0,0 +1,19 @@
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  labels:
+    app: app-monitor
+    release: prometheus-operator # required by Prometheus CRD
+  name: app-monitor
+  namespace: kube-system
+spec:
+  endpoints:
+  - interval: 30s
+    port: http
+    path: /metrics
+  jobLabel: app.kubernetes.io/instance
+  namespaceSelector:
+    any: true
+  selector:
+    matchLabels:
+      prometheus.io/monitor: http