* kubectl: fixed an issue with "too old resource version" errors continuously appearing when calling `kubectl delete` ([#72825](https://github.com/kubernetes/kubernetes/pull/72825), [@liggitt](https://github.com/liggitt))
* Fixes issue where subpath volume content was deleted during orphaned pod cleanup for Local volumes that are directories (and not mount points) on the root filesystem. ([#72291](https://github.com/kubernetes/kubernetes/pull/72291), [@msau42](https://github.com/msau42))

## Changelog since v1.10.3

### Other notable changes

* Fixes issue for readOnly subpath mounts for SELinux systems and when the volume mountPath already existed in the container image. ([#64351](https://github.com/kubernetes/kubernetes/pull/64351), [@msau42](https://github.com/msau42))

    * Implements subPathExpr field for expanding environment variables into a subPath
    * The fields subPathExpr and subPath are mutually exclusive
    * Note: This is a breaking change from the previous version of this alpha feature

  // Expanded path within the volume from which the container's volume should be mounted.
  // Behaves similarly to SubPath but environment variable references $(VAR_NAME) are expanded using the container's environment.
  // Defaults to "" (volume's root).
  // SubPathExpr and SubPath are mutually exclusive.
  // +optional
  optional string subPathExpr = 6;
}

* change azure disk host cache to ReadOnly by default ([#72229](https://github.com/kubernetes/kubernetes/pull/72229), [@andyzhangx](https://github.com/andyzhangx))
* Fixes issue with cleaning up stale NFS subpath mounts ([#71804](https://github.com/kubernetes/kubernetes/pull/71804), [@msau42](https://github.com/msau42))

* Fix pods failing to start if they specify a file as a volume subPath to mount. ([#46046](https://github.com/kubernetes/kubernetes/pull/46046), [@enisoc](https://github.com/enisoc))



# v1.6.3

[Documentation](https://docs.k8s.io) & [Examples](https://releases.k8s.io/release-1.6/examples)

## Known Issues for v1.6.3

## Changelog since v1.7.15

### Action Required

* ACTION REQUIRED: In-place node upgrades to this release from versions 1.7.14, 1.8.9, and 1.9.4 are not supported if using subpath volumes with PVCs.  Such pods should be drained from the node first. ([#61373](https://github.com/kubernetes/kubernetes/pull/61373), [@msau42](https://github.com/msau42))

### Other notable changes

* Bump version of prometheus-to-sd to 0.2.6 to decrease log noise and include latest security patches. ([#64963](https://github.com/kubernetes/kubernetes/pull/64963), [@loburm](https://github.com/loburm))
* Fixes issue for readOnly subpath mounts for SELinux systems and when the volume mountPath already existed in the container image. ([#64351](https://github.com/kubernetes/kubernetes/pull/64351), [@msau42](https://github.com/msau42))

- Make sure auto-mounted subpath mount source is already mounted ([#112499](https://github.com/kubernetes/kubernetes/pull/112499), [@andyzhangx](https://github.com/andyzhangx)) [SIG Storage]

## Dependencies

### Added
_Nothing has changed._

* Fix kube-controller-manager panic while provisioning Azure security group rules ([#64739](https://github.com/kubernetes/kubernetes/pull/64739), [@feiskyer](https://github.com/feiskyer))
* Fixes issue for readOnly subpath mounts for SELinux systems and when the volume mountPath already existed in the container image. ([#64351](https://github.com/kubernetes/kubernetes/pull/64351), [@msau42](https://github.com/msau42))