* Authenticated users are decorated with a 'system:authenticated' group.
    * NOTE: anonymous access is enabled by default. If you rely on authentication alone to authorize access, change to use an authorization mode other than AlwaysAllow, or or set '--anonymous-auth=false'.

## Changes to Major Components
### API Server
* **`--anonymous-auth` is enabled by default, unless the API server is started with the `AlwaysAllow` authorizer. ([#38706](https://github.com/kubernetes/kubernetes/pull/38706), [@deads2k](https://github.com/deads2k))**

- The PodDisruptionBudget `spec.unhealthyPodEvictionPolicy` field has graduated to beta and is enabled by default. On servers with the feature enabled, this field may be set to `AlwaysAllow` to always allow unhealthy pods covered by the PodDisruptionBudget to be evicted. ([#115363](https://github.com/kubernetes/kubernetes/pull/115363), [@ravisantoshgudimetla](https://github.com/ravisantoshgudimetla)) [SIG Apps, Auth and Node]

- The PodDisruptionBudget `spec.unhealthyPodEvictionPolicy` field has graduated to GA. This field may be set to `AlwaysAllow` to always allow unhealthy pods covered by the PodDisruptionBudget to be evicted. ([#123428](https://github.com/kubernetes/kubernetes/pull/123428), [@atiratree](https://github.com/atiratree)) [SIG Apps, Auth, Node and Testing]

- '`PodDisruptionBudget` now adds an alpha `spec.unhealthyPodEvictionPolicy` field.
  When the `PDBUnhealthyPodEvictionPolicy` feature-gate is enabled in `kube-apiserver`,
  setting this field to `"AlwaysAllow"` allows pods to be evicted if they do not
  have a ready condition, regardless of whether the PodDisruptionBudget is currently
  healthy.'

* 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 config from a file. ([#59666](https://github.com/kubernetes/kubernetes/pull/59666), [@mtaufen](https://github.com/mtaufen))