/** Configuration key for directories to exclude from SPNEGO authentication. */
    protected static final String SPNEGO_EXCLUDE_DIRS = "spnego.exclude.dirs";

    /** Configuration key for enabling delegation in SPNEGO authentication. */
    protected static final String SPNEGO_ALLOW_DELEGATION = "spnego.allow.delegation";

    /** Configuration key for allowing localhost authentication bypass. */

- Added support to the kube-apiserver for an alpha feature enabling external signing of service account tokens and fetching of public verifying keys, by enabling the Alpha `ExternalServiceAccountTokenSigner` feature gate and specifying `--service-account-signing-endpoint`. The flag value can either be the location of a Unix domain socket on a filesystem, or be...

- Introduced the `LegacySidecarContainers` feature gate enabling the legacy code path that predates the `SidecarContainers` feature. This temporary feature gate is disabled by default, only available in v1.33, and will be removed in v1.34. ([#130058](https://github.com/kubernetes/kubernetes/pull/130058), [@gj...

- Job: Fix a bug that the SuccessCriteriaMet could be added to the Job with successPolicy regardless of the featureGate enabling ([#125455](https://github.com/kubernetes/kubernetes/pull/125455), [@tenzen-y](https://github.com/tenzen-y)) [SIG Apps]

- Kube-apiserver: Promoted the `ExternalServiceAccountTokenSigner` feature to beta, which enabled external signing of service account tokens and fetching of public verifying keys. This was accomplished by enabling the beta `ExternalServiceAccountTokenSigner` feature gate and specifying the `--service-account-signing-endpoint` flag. The flag value could either be the path to a Unix domain socket on the filesystem, or be prefixed with @ to indicate a Unix domain...

- Added `UserNamespacesPodSecurityStandards` feature gate to enable user namespace support for Pod Security Standards.
  Enabling this feature will modify all Pod Security Standard rules to allow setting: `spec[.*].securityContext.[runAsNonRoot,runAsUser]`.

- Marked the feature gate `ExperimentalHostUserNamespaceDefaulting` as deprecated.

- Job: Fix a bug that the SuccessCriteriaMet could be added to the Job with successPolicy regardless of the featureGate enabling ([#125429](https://github.com/kubernetes/kubernetes/pull/125429), [@tenzen-y](https://github.com/tenzen-y)) [SIG Apps]