* Fix an issue where filesystems are not unmounted when a backend is not reachable and returns EIO. ([#67097](https://github.com/kubernetes/kubernetes/pull/67097), [@chakri-nelluri](https://github.com/chakri-nelluri))

- Add a event to PV when filesystem on PV does not match actual filesystem on disk ([#86982](https://github.com/kubernetes/kubernetes/pull/86982), [@gnufied](https://github.com/gnufied)) [SIG Storage]

- XFS-filesystems are now force-formatted (option `-f`) in order to avoid problems being formatted due to detection of magic super-blocks. This aligns with the behaviour of formatting of ext3/4 filesystems. ([#104923](https://github.com/kubernetes/kubernetes/pull/104923), [@davidkarlsen](https://github.com/davidkarlsen))

`LocalStorageCapacityIsolationFSQuotaMonitoring=true`. For ext4fs filesystems, create the filesystem with `mkfs.ext4 -O project <block_device>` and run `tune2fs -Q prjquota `block device`; XFS filesystems need no additional preparation. The filesystem must be mounted with option `project` in `/etc/fstab`. If the primary partition is the root filesystem, add `rootflags=pquota` to the GRUB config file. ([#66928](https://github.com/kubernetes/kubernetes/pull/66928), [@RobertKrawitz](https://github.com/RobertKrawitz))...

* kubeadm: Fixed support of node certificates when joining a cluster ([#69328](https://github.com/kubernetes/kubernetes/pull/69328), [@bart0sh](https://github.com/bart0sh))
* Fix an issue where filesystems are not unmounted when a backend is not reachable and returns EIO. ([#67097](https://github.com/kubernetes/kubernetes/pull/67097), [@chakri-nelluri](https://github.com/chakri-nelluri))

- Disabled reading of disk geometry before calling expansion for ext and xfs filesystems. ([#131568](https://github.com/kubernetes/kubernetes/pull/131568), [@gnufied](https://github.com/gnufied))

  - [Changelog since v1.21.4](#changelog-since-v1214)
  - [Important Security Information](#important-security-information)
    - [CVE-2021-25741: Symlink Exchange Can Allow Host Filesystem Access](#cve-2021-25741-symlink-exchange-can-allow-host-filesystem-access)
  - [Changes by Kind](#changes-by-kind-8)
    - [Feature](#feature-6)
    - [Bug or Regression](#bug-or-regression-8)
    - [Other (Cleanup or Flake)](#other-cleanup-or-flake-1)

* Fix potential panic when getting azure load balancer status ([#68609](https://github.com/kubernetes/kubernetes/pull/68609), [@feiskyer](https://github.com/feiskyer))
* Fix an issue where filesystems are not unmounted when a backend is not reachable and returns EIO. ([#67097](https://github.com/kubernetes/kubernetes/pull/67097), [@chakri-nelluri](https://github.com/chakri-nelluri))

- Disable reading of disk geometry before calling expansion for ext and xfs filesystems ([#131636](https://github.com/kubernetes/kubernetes/pull/131636), [@gnufied](https://github.com/gnufied)) [SIG Storage]

- The `KubeletSeparateDiskGC` feature gate is now beta. This split image filesystem feature enables kubelet to perform garbage collection of images (read-only layers) and/or containers (writeable layers) deployed on separate filesystems. gate is now beta. ([#126205](https://github.com/kubernetes/kubernetes/pull/126205), [@kwilczynski](https://github.com/kwilczynski))