- Listed the pods using `<PVC>` as an ephemeral storage volume in "Used by:" part of the output of `kubectl describe pvc <PVC>` command. ([#120427](https://github.com/kubernetes/kubernetes/pull/120427), [@MaGaroo](https://github.com/MaGaroo))

## Changelog since v1.17.13

## Changes by Kind

### Bug or Regression

kube-controller-manager will be aware of the `volumeAttributesClassName` field of PVC and PV objects. The `volumeAttributesClassName` field is a reference to a VolumeAttributesClass object, which contains a set of key-value pairs that present mutable attributes of the volume. It's forbidden to change the `volumeAttributesClassName` field of a PVC object until the PVC is bound to a PV object. During the binding process, if a PVC has a `volumeAttributesClassName` field set, the controller will only consider...

28), [@divyenpatel](https://github.com/divyenpatel))

* Emit number of bound and unbound persistent volumes as Metrics. This PR adds four kinds of Volume Metrics for kube-controller-manager: bound PVC numbers, unbound PVC numbers, bound PV numbers and unbound PV numbers. The PVC metrics use namespace as dimension and the PV metrics use StorageClassName as its dimension. With these metrics we can better monitor the use of volumes in the cluster. ([#57872](https://github.com/kubernetes...

## Changelog since v1.18.10

## Changes by Kind

### Bug or Regression

- Kubelet: fix a bug where the unexpected NodeResizeError condition was in PVC status when the csi driver does not support node volume expansion and the pvc has the ReadWriteMany access mode. ([#131524](https://github.com/kubernetes/kubernetes/pull/131524), [@carlory](https://github.com/carlory)) [SIG Storage]

* allow restricting subresource access ([#30001](https://github.com/kubernetes/kubernetes/pull/30001), [@deads2k](https://github.com/deads2k))
* Fix PVC.Status.Capacity and AccessModes after binding ([#29982](https://github.com/kubernetes/kubernetes/pull/29982), [@jsafrane](https://github.com/jsafrane))

  the newer `apiVersion`. ([#116299](https://github.com/kubernetes/kubernetes/pull/116299), [@pohly](https://github.com/pohly))
- `volumes`: `resource.claims` is now cleared for PVC specs during create or update of a pod spec with inline PVC template or of a PVC because it has no effect. ([#115928](https://github.com/kubernetes/kubernetes/pull/115928), [@pohly](https://github.com/pohly))

### Feature

    * [event-exporter addon] Bump event-exporter to 0.2.3 to pick up security fixes.
* PVC may not be synced to controller local cache in time if PV is bound by external PV binder (e.g. kube-scheduler), double check if PVC is not found to prevent reclaiming PV wrongly. ([#67062](https://github.com/kubernetes/kubernetes/pull/67062), [@cofyc](https://github.com/cofyc))

- Kubelet: Fixed a bug that caused an unexpected `NodeResizeError` condition to appear in the PVC status when the CSI driver did not support node volume expansion and the PVC had the `ReadWriteMany` access mode. ([#131495](https://github.com/kubernetes/kubernetes/pull/131495), [@carlory](https://github.com/carlory))