Annotate nginx-ingress addon for Prometheus auto-discovery

* Add Google Cloud firewall rule to allow worker to worker access
to health and metrics

addons/nginx-ingress/aws/service.yaml

@@ -3,6 +3,9 @@ kind: Service
 metadata:
   name: nginx-ingress-controller
   namespace: ingress
+  annotations:
+    prometheus.io/scrape: 'true'
+    prometheus.io/port: '10254'
 spec:
   type: ClusterIP
   selector:

addons/nginx-ingress/digital-ocean/service.yaml

@@ -3,6 +3,9 @@ kind: Service
 metadata:
   name: nginx-ingress-controller
   namespace: ingress
+  annotations:
+    prometheus.io/scrape: 'true'
+    prometheus.io/port: '10254'
 spec:
   type: ClusterIP
   selector:

addons/nginx-ingress/google-cloud/service.yaml

@@ -3,6 +3,9 @@ kind: Service
 metadata:
   name: nginx-ingress-controller
   namespace: ingress
+  annotations:
+    prometheus.io/scrape: 'true'
+    prometheus.io/port: '10254'
 spec:
   type: ClusterIP
   selector: