UPSTREAM: PVC metrics in kubelet summary api + prometheus

[wongma7]

https://github.com/kubernetes/kubernetes/pull/51448/files
https://github.com/kubernetes/kubernetes/pull/51553/files

[childsb]

/assign @bparees

[childsb]

/retest

[bparees]

@childsb ?
/unassign

[wongma7]

/retest

[wongma7]

working:

# HELP kubelet_volume_stats_available_bytes Number of available bytes in the volume
# TYPE kubelet_volume_stats_available_bytes gauge
kubelet_volume_stats_available_bytes{namespace="default",persistentvolumeclaim="mysql"} 8.47814656e+08
# HELP kubelet_volume_stats_capacity_bytes Capacity in bytes of the volume
# TYPE kubelet_volume_stats_capacity_bytes gauge
kubelet_volume_stats_capacity_bytes{namespace="default",persistentvolumeclaim="mysql"} 1.02330368e+09
# HELP kubelet_volume_stats_inodes Maximum number of inodes in the volume
# TYPE kubelet_volume_stats_inodes gauge
kubelet_volume_stats_inodes{namespace="default",persistentvolumeclaim="mysql"} 65536
# HELP kubelet_volume_stats_inodes_free Number of free inodes in the volume
# TYPE kubelet_volume_stats_inodes_free gauge
kubelet_volume_stats_inodes_free{namespace="default",persistentvolumeclaim="mysql"} 65524
# HELP kubelet_volume_stats_inodes_used Number of used inodes in the volume
# TYPE kubelet_volume_stats_inodes_used gauge
kubelet_volume_stats_inodes_used{namespace="default",persistentvolumeclaim="mysql"} 12
# HELP kubelet_volume_stats_used_bytes Number of used bytes in the volume
# TYPE kubelet_volume_stats_used_bytes gauge
kubelet_volume_stats_used_bytes{namespace="default",persistentvolumeclaim="mysql"} 1.05025536e+08

/dev/xvdbm      976M  101M  809M  12% /root/openshift.local.volumes/plugins/kubernetes.io/aws-ebs/mounts/aws/us-east-1d/vol-05c6166b7bf6451ba

8.47814656e+08 bytes = 809 mebibytes

[soltysh]

/unassign
/assign @childsb

[childsb]

/lgtm

[wongma7]

/assign @eparis

Please approve, thank you :)

[eparis]

/approve
api approved because it matches the upstream api change

[openshift-merge-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: childsb, eparis, wongma7

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these OWNERS Files:

• vendor/k8s.io/kubernetes/pkg/kubelet/OWNERS [eparis]

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[openshift-merge-robot]

Automatic merge from submit-queue (batch tested with PRs 16205, 16423)