- ProcMount has been added to SecurityContext and AllowedProcMounts has been added to PodSecurityPolicy to allow paths in the container's /proc to not be masked. ([#64283](https://github.com/kubernetes/kubernetes/pull/64283), [@jessfraz](https://github.com/jessfraz)) Courtesy of SIG API Machinery, SIG Apps, SIG Architecture, and SIG Node

## Before Upgrading

Consider the following changes, limitations, and guidelines before you upgrade:

* The kubelet now fails if swap is enabled on a node. To override the default and run with /proc/swaps on, set `--fail-swap-on=false`. The experimental flag `--experimental-fail-swap-on` is deprecated in this release, and will be removed in a future release.

- Fixed applying of SELinux labels to CSI volumes on very busy systems (with "error checking for SELinux support: could not get consistent content of /proc/self/mountinfo after 3 attempts") ([#105934](https://github.com/kubernetes/kubernetes/pull/105934), [@jsafrane](https://github.com/jsafrane)) [SIG Storage]

- Faster mount detection for linux kernel 5.10+ using openat2 speeding up pod churn rates. On Kernel versions less 5.10, it will fallback to using the original way of detecting mount points i.e by parsing /proc/mounts. ([#109217](https://github.com/kubernetes/kubernetes/pull/109217), [@manugupt1](https://github.com/manugupt1))

- Kubectl: print error if users place flags before plugin name ([#92343](https://github.com/kubernetes/kubernetes/pull/92343), [@knight42](https://github.com/knight42)) [SIG CLI]
- Kubelet: assume that swap is disabled when `/proc/swaps` does not exist ([#93931](https://github.com/kubernetes/kubernetes/pull/93931), [@SataQiu](https://github.com/SataQiu)) [SIG Node]

* add support for projected volume in describe function  ([#70158](https://github.com/kubernetes/kubernetes/pull/70158), [@WanLinghao](https://github.com/WanLinghao))
* Speedup process lookup in /proc ([#66367](https://github.com/kubernetes/kubernetes/pull/66367), [@cpuguy83](https://github.com/cpuguy83))

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