* Used inline func to ensure unlock is executed ([#61644](https://github.com/kubernetes/kubernetes/pull/61644), [@resouer](https://github.com/resouer))
* kubernetes-master charm now properly clears the client-ca-file setting on the apiserver snap ([#61479](https://github.com/kubernetes/kubernetes/pull/61479), [@hyperbolic2346](https://github.com/hyperbolic2346))

## 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.

- Added full cgroup v2 swap support for both `Limited` and `Unlimited` swap.
  
  When `LimitedSwap` is enabled the swap limit would be automatically calculated for
  Burstable QoS pods. For Best-Effort/Guaranteed QoS pods, swap would be disabled.
  
  Containers with memory requests equal to their memory limits also won't have
  swap access, and it is a way to opt-out of swap for a single container.
  

- `kubeadm`: updated warning message when swap space is detected. When swap is
  active on Linux, `kubeadm` explains that swap is supported for cgroup v2 only and
  is beta but disabled by default. ([#120198](https://github.com/kubernetes/kubernetes/pull/120198), [@pacoxu](https://github.com/pacoxu))

- Added a `--show-swap` option to `kubectl top` subcommands ([#129458](https://github.com/kubernetes/kubernetes/pull/129458), [@iholder101](https://github.com/iholder101)) [SIG CLI]

### Kubernetes Node system swap support

Every system administrator or Kubernetes user has been in the same boat regarding setting up and using Kubernetes: disable swap space. With the release of Kubernetes 1.22, *alpha* support is available to run nodes with swap memory. This change lets administrators opt in to configuring swap on Linux nodes, treating a portion of block storage as additional virtual memory.

- Changed Linux swap handling to restrict access to swap for containers in high priority Pods.
  New Pods that have a node- or cluster-critical priority are prohibited from accessing swap on Linux,

- Removed general available feature-gate `PDBUnhealthyPodEvictionPolicy`. ([#129500](https://github.com/kubernetes/kubernetes/pull/129500), [@carlory](https://github.com/carlory)) [SIG API Machinery, Apps and Auth]
- Start reporting swap capacity as part of `node.status.nodeSystemInfo`. ([#129954](https://github.com/kubernetes/kubernetes/pull/129954), [@iholder101](https://github.com/iholder101)) [SIG API Machinery, Apps and Node]

// https://www.iana.org/domains/root/db/sandvikcoromant.html
sandvikcoromant

// sanofi : Sanofi
// https://www.iana.org/domains/root/db/sanofi.html
sanofi

// sap : SAP AG
// https://www.iana.org/domains/root/db/sap.html
sap

// sarl : Binky Moon, LLC
// https://www.iana.org/domains/root/db/sarl.html
sarl

// sas : Research IP LLC
// https://www.iana.org/domains/root/db/sas.html
sas

  - The deprecated `--show-all` flag to `kubectl get` has been removed  ([#69255](https://github.com/kubernetes/kubernetes/pull/69255), [@Pingan2017](https://github.com/Pingan2017))

- kubelet
  - The deprecated `--experimental-fail-swap-on` flag has been removed ([#69552](https://github.com/kubernetes/kubernetes/pull/69552), [@Pingan2017](https://github.com/Pingan2017))