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- Raw block volume support is promoted to beta, and enabled by default. This is accessible via the `volumeDevices` container field in pod specs, and the `volumeMode` field in persistent volume and persistent volume claims definitions. ([#71167](https://github.com/kub...

    * When a pod is deleted, the controller waits for the volume to be safely unmounted by kubelet. It does this by waiting for the volume to no longer be present in the nodes Node.Status.VolumesInUse list. If the volume is not safely unmounted by kubelet within a pre-configured duration (3 minutes in Kubernetes v1.3),...

### Other notable changes

* Fix issue in reconstruct volume data when kubelet restarts ([#36616](https://github.com/kubernetes/kubernetes/pull/36616), [@jingxu97](https://github.com/jingxu97))
* Add sync state loop in master's volume reconciler ([#34859](https://github.com/kubernetes/kubernetes/pull/34859), [@jingxu97](https://github.com/jingxu97))

  * Don't try to attach volume to new node if it is already attached to another node and the volume does not support multi-attach. ([#45346](https://github.com/kubernetes/kubernetes/pull/45346), [@codablock](https://github.com/codablock))

      - [Bug fixes](#bug-fixes-1)
    - [kube-controller-manager](#kube-controller-manager)
    - [kube-dns](#kube-dns)
    - [kube-proxy](#kube-proxy)
    - [Scheduler](#scheduler)
    - [Volume Plugins](#volume-plugins)
      - [Azure Disk](#azure-disk)
      - [GlusterFS](#glusterfs)
      - [Photon](#photon)
      - [rbd](#rbd)
      - [vSphere](#vsphere-1)

New alpha features include:
* Online volume resizing will increase the filesystem size of a resized volume without requiring a Pod restart.

    - [IPv4/IPv6 run](#ipv4ipv6-run)
    - [go1.15.5](#go1155)
    - [CSI Volume Snapshot graduates to General Availability](#csi-volume-snapshot-graduates-to-general-availability)
    - [Non-recursive Volume Ownership (FSGroup) graduates to Beta](#non-recursive-volume-ownership-fsgroup-graduates-to-beta)
    - [CSIDriver policy for FSGroup graduates to Beta](#csidriver-policy-for-fsgroup-graduates-to-beta)

- Kubelet: Fix the volume manager didn't check the device mount state in the actual state of the world before marking the volume as detached. It may cause a pod to be stuck in the Terminating state due to the above issue when it was deleted. ([#129063](https://github.com/kubernetes/kubernetes/pull/129063), [@carlory](https...