### Other notable changes

* CustomResourceDefinitions: OpenAPI v3 validation schemas containing `$ref`references are no longer permitted (valid references could not be constructed previously because property ids were not permitted either). Before upgrading, ensure CRD definitions do not include those `$ref` fields. ([#58438](https://github.com/kubernetes/kubernetes/pull/58438), [@carlory](https://github.com/carlory))

  <mime-type type="message/http"/>
  <mime-type type="message/imdn+xml"/>

  <mime-type type="message/news">
    <magic priority="60">
      <match value="Path:" type="string" offset="0" />
      <match value="Xref:" type="string" offset="0" />
    </magic>
    <magic priority="50">
      <match value="Article" type="string" offset="0" />
    </magic>
    <sub-class-of type="text/x-tika-text-based-message"/>

- This code change fixes the bug that UDP services would trigger unnecessary LoadBalancer updates. The root cause is that a field not working for non-TCP protocols is considered.
  ref: https://github.com/kubernetes-sigs/cloud-provider-azure/pull/1090 ([#107981](https://github.com/kubernetes/kubernetes/pull/107981), [@lzhecheng](https://github.com/lzhecheng))

* PodDisruptionBudget now uses [ControllerRef](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/api-machinery/controller-ref.md) to make the right decisions about Pod eviction even if the built in application controllers have overlapping selectors.

### **Security**
#### Admission Control

- Kube-scheduler: support for configuration file version `v1beta1` is removed. Update configuration files to v1beta2(xref: https://github.com/kubernetes/enhancements/issues/2901) or v1beta3 before upgrading to 1.23. ([#104782](https://github.com/kubernetes/kubernetes/pull/104782), [@kerthcet](https://github.com/kerthcet))

pkg net, type Listener interface, Addr() Addr
pkg net, type Listener interface, Close() error
pkg net, type MX struct
pkg net, type MX struct, Host string
pkg net, type MX struct, Pref uint16
pkg net, type OpError struct
pkg net, type OpError struct, Addr Addr
pkg net, type OpError struct, Err error
pkg net, type OpError struct, Net string
pkg net, type OpError struct, Op string