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Kubernetes Submit Queue 17dffc1ef5 Merge pull request #51448 from kastenhq/pvc_ref_volstats

Automatic merge from submit-queue (batch tested with PRs 51513, 51515, 50570, 51482, 51448)

Add PVCRef to VolumeStats

**What this PR does / why we need it**:
For pod volumes that reference a PVC, add a PVCRef to the corresponding
volume stat. This allows metrics to be indexed/queried by PVC name
which is more user-friendly than Pod reference

**Which issue this PR fixes** : [#363](https://github.com/kubernetes/features/issues/363)

**Special notes for your reviewer**:

**Release note**:
```
`VolumeStats` reported by the kubelet stats summary API 
(http://<node>:10255/stats/summary) now include a PVCRef
field describing the PVC referenced by the volume (if any). 
```

2017-08-31 22:09:20 -07:00