Monitor CoreDNS over svc

roles/kubernetes-apps/ansible/templates/coredns-svc.yml.j2

@@ -9,14 +9,21 @@ metadata:
     kubernetes.io/cluster-service: "true"
     addonmanager.kubernetes.io/mode: Reconcile
     kubernetes.io/name: "CoreDNS"
+  annotations:
+    prometheus.io/path: /metrics
+    prometheus.io/port: "9153"
+    prometheus.io/scrape: "true"
 spec:
   selector:
     k8s-app: coredns{{ coredns_ordinal_suffix | default('') }}
   clusterIP: {{ clusterIP }}
   ports:
-  - name: dns
-    port: 53
-    protocol: UDP
-  - name: dns-tcp
-    port: 53
-    protocol: TCP
+    - name: dns
+      port: 53
+      protocol: UDP
+    - name: dns-tcp
+      port: 53
+      protocol: TCP
+    - name: metrics
+      port: 9153
+      protocol: TCP