- Support [service.beta.kubernetes.io/azure-pip-ip-tags] annotations to allow customers to specify ip-tags to influence public-ip creation in Azure [Tag1=Value1, Tag2=Value2, etc.] ([#94114](https://github.com/kubernetes/kubernetes/pull/94114), [@MarcPow](https://github.com/MarcPow)) [SIG Cloud Provider]

- Fixed the documentation for the default value of the `procMount` entry in `securityContext` within a Pod.
  The documentation was previously using the name of the internal variable `DefaultProcMount`, rather than the actual value, "Default". ([#125782](https://github.com/kubernetes/kubernetes/pull/125782), [@aborrero](https://github.com/aborrero)) [SIG Apps and Node]

can now store only `null` when created using the protobuf content-type or stored in etcd using protobuf serialization (the default in 1.6).
JSON API clients should tolerate `null` values for such fields, and treat `null` and `[]` as equivalent in meaning unless specifically documented otherwise for a particular field. ([#44593](https://github.com/kubernetes/kubernetes/pull/44593))

* fix azure pv crash due to volumeSource.ReadOnly value nil ([#54607](https://github.com/kubernetes/kubernetes/pull/54607), [@andyzhangx](https://github.com/andyzhangx))
* kubeadm init: fix a bug that prevented the --token-ttl flag and tokenTTL configuration value from working as expected for infinite (0) values. ([#54640](https://github.com/kubernetes/kubernetes/pull/54640), [@mattmoyer](https://github.com/mattmoyer))

*   If multiple PodSecurityPolicy objects allow a submitted pod, priority is given to policies that do not require default values for any fields in the pod spec. If default values are required, the first policy ordered by name that allows the pod is used. ([#52849](https://github.com/kubernetes/kubernetes/pull/52849),[ @liggitt](https://github.com/liggitt))

installation processes must be updated with the new path. ([#58171](https://github.com/kubernetes/kubernetes/pull/58171), [@verult](https://github.com/verult))

* Default values differ between the Kubelet's componentconfig (config file) API and the Kubelet's command line. Be sure to review the default values when migrating to using a config file. For example, the authz mode is set to "AlwaysAllow" if you rely on the command line, but defaults to the more secure "Webhook" mode if you load...

- New "dry_run" metric label (indicating the value of the dryRun query parameter) has been added into the metrics:
  * apiserver_request_total
  * apiserver_request_duration_seconds  

## Changelog since v1.21.5

## Changes by Kind

### API Change

- Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums (#104989, @liggitt) [SIG API Machinery, Apps and Network]

### Feature

- Kubernetes is now built with Golang 1.16.9 (#105672, @cpanato) [SIG Cloud Provider, Instrumentation, Release and Testing]

authentication now supports requiring specific claims with `--oidc-required-claim=<claim>=<value>` Previously, there was no mechanism for a user to specify claims in the OIDC authentication process that were requid to be present in the ID Token with an expected value. This version now makes it possible to require claims support for the OIDC authentication. It allows users to pass in a `--oidc-required-claims` flag, and `key=value` pairs in the API config, which will ensure that the specified required claims...

* `kubectl wait` now supports condition value checks other than true using `--for condition=available=false` ([#69295](https://git...