- `kube-apiserver` added two new metrics `authorization_attempts_total` and `authorization_duration_seconds`
  that allow users to monitor requests to authorization webhooks, split by result. ([#117211](https://github.com/kubernetes/kubernetes/pull/117211), [@HirazawaUi](https://github.com/HirazawaUi))

- Added authorization check support to the CEL expressions of ValidatingAdmissionPolicy via a `authorizer`

- kube-apiserver now reported the following metrics for authorization webhook match conditions: - `apiserver_authorization_match_condition_evaluation_errors_total` counter metric labeled by authorizer type and name - `apiserver_authorization_match_condition_exclusions_total` counter metric labeled by authorizer type and name - `apiserver_authorization_match_condition_evaluation_seconds` histogram metric labeled by authorizer type and name.

- `kube-apiserver`: added `--authorization-config` flag for reading a configuration file containing an `apiserver.config.k8s.io/v1alpha1 AuthorizationConfiguration` object. The `--authorization-config` flag is mutually exclusive with `--authorization-modes` and `--authorization-webhook-*` flags. The `alpha` `StructuredAuthorizationConfiguration` feature flag must be enabled for `--authorization-config` to be specified. ([#120154](https://github.com/kubernetes...

- API Server tracing now includes the latency of authorization, priorityandfairness, impersonation, audit, and authentication filters. ([#113217](https://github.com/kubernetes/kubernetes/pull/113217), [@dashpole](https://github.com/dashpole))