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open prometheus metrics port of kube-dns #2679
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What this PR does / why we need it:
This PR opens the prometheus metrics collection port for kube-dns.
Which issue this PR fixes (optional, in
fixes #<issue number>(, fixes #<issue_number>, ...)format, will close that issue when PR gets merged): fixes #Recently in our cluster, due to some unknown issue, the kube-dns was crashing continuously. We already had prometheus-alertmanager-grafana in place, but because of closed metrics port for kube-dns we could not monitor and set alerts on it. It took a while for us to figure out that kube-dns was crashing. This PR enables monitoring of kube-dns using prometheus.
Special notes for your reviewer:
If applicable:
Release note: