Qualify external-attacher 2.1.1 in RC staging; enable Prometheus metrics in external-provisioner

Author: verult

deploy/kubernetes/overlays/prow-gke-release-staging-rc/kustomization.yaml

@@ -11,10 +11,18 @@ images:
   newTag: "v1.5.0-gke.0"
 - name: gke.gcr.io/csi-attacher
   newName: gcr.io/gke-release-staging/csi-attacher
-  newTag: "v2.1.0-gke.0"
+  newTag: "v2.1.1-gke.0"
 - name: gke.gcr.io/csi-node-driver-registrar
   newName: gcr.io/gke-release-staging/csi-node-driver-registrar
   newTag: "v1.2.0-gke.0"
 - name: gke.gcr.io/csi-resizer
   newName: gke.gcr.io/gke-release-staging/csi-resizer
   newTag: "v0.4.0-gke.0"
+
+patchesJson6902:
+- target:
+    group: apps
+    version: v1
+    kind: StatefulSet
+    name: csi-gce-pd-controller
+  path: provisioner_metric_args.yaml

deploy/kubernetes/overlays/prow-gke-release-staging-rc/provisioner_metric_args.yaml

@@ -0,0 +1,3 @@
+- op: add
+  path: /spec/template/spec/containers/0/args/-
+  value: "--metrics-address=:8080"