Merge pull request #65589 from rajansandeep/scrapeport

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Add prometheus scrape port to CoreDNS service

**What this PR does / why we need it**:
Add prometheus scrape port

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #https://github.com/kubernetes/kubeadm/issues/955

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

cluster/addons/dns/coredns/coredns.yaml.base

@@ -161,6 +161,7 @@ metadata:
   name: kube-dns
   namespace: kube-system
   annotations:
+    prometheus.io/port: "9153"
     prometheus.io/scrape: "true"
   labels:
     k8s-app: kube-dns

cluster/addons/dns/coredns/coredns.yaml.in

@@ -161,6 +161,7 @@ metadata:
   name: kube-dns
   namespace: kube-system
   annotations:
+    prometheus.io/port: "9153"
     prometheus.io/scrape: "true"
   labels:
     k8s-app: kube-dns

cluster/addons/dns/coredns/coredns.yaml.sed

@@ -161,6 +161,7 @@ metadata:
   name: kube-dns
   namespace: kube-system
   annotations:
+    prometheus.io/port: "9153"
     prometheus.io/scrape: "true"
   labels:
     k8s-app: kube-dns

cmd/kubeadm/app/phases/addons/dns/manifests.go

@@ -189,6 +189,7 @@ metadata:
   name: kube-dns
   namespace: kube-system
   annotations:
+    prometheus.io/port: "9153"
     prometheus.io/scrape: "true"
   # Without this resourceVersion value, an update of the Service between versions will yield:
   #   Service "kube-dns" is invalid: metadata.resourceVersion: Invalid value: "": must be specified for an update