Exposing controller metrics on port 8080 on all IPs, a la CAPV. (#22)

* Exposing controller metrics on port 8080 on all IPs, a la CAPV.

* Reverting change to default metrics-addr: localhost only by default.  If desired to make port accessible outside the pod run manager with --metrics-addr=:8080.

Author: jweite-amazon

config/default/kustomization.yaml

@@ -29,6 +29,7 @@ patchesStrategicMerge:
 - manager_image_patch_edited.yaml
 - manager_webhook_patch.yaml
 - webhookcainjection_patch.yaml
+- manager_prometheus_metrics_patch.yaml
 
 # Protect the /metrics endpoint by putting it behind auth.
 # If you want your controller-manager to expose the /metrics

config/default/manager_prometheus_metrics_patch.yaml

@@ -0,0 +1,19 @@
+# This patch enables Prometheus scraping for the manager pod.
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: controller-manager
+  namespace: system
+spec:
+  template:
+    metadata:
+      annotations:
+        prometheus.io/scrape: 'true'
+    spec:
+      containers:
+      # Expose the prometheus metrics on default port
+      - name: manager
+        ports:
+        - containerPort: 8080
+          name: metrics
+          protocol: TCP