- Graduated the `LegacyServiceAccountTokenTracking` feature gate to Beta. The usage of auto-generated secret-based service account token now produces warnings by default, and relevant Secrets are labeled with a last-used timestamp (label key `kubernetes.io/legacy-token-last-used`). ([#114523](https://github.com/kubernetes/kubernetes/pull/114523), [@zshihang](https://github.com/zshihang)) [SIG API Machinery and Auth]

 - The default Bootstrap Token created with `kubeadm init` v1.8 expires
 and is deleted after 24 hours by default to limit the exposure of the
 valuable credential. You can create a new Bootstrap Token with
 `kubeadm token create` or make the default token permanently valid by specifying
 `--token-ttl 0` to `kubeadm init`. The default token can later be deleted with
 `kubeadm token delete`.

  is now available as alpha (off by default). When enabled, the `legacy-service-account-token-cleaner`
  controller loop removes service account token secrets that have not been used
  in the time specified by `--legacy-service-account-token-clean-up-period` (defaulting
  to one year), **and are** referenced from the `.secrets` list of a ServiceAccount

ServiceAccount. Use the [TokenRequest](https://kubernetes.io/docs/reference/kubernetes-api/authentication-resources/token-request-v1/) API to acquire service account tokens, or if a non-expiring token is required, create a Secret API object for the token controller to populate with a service account token by following this [guide](https://kubernetes.io/docs/concepts/configuration/secret/#service-account-token-secrets). ([#108309](https://github.com/kubernetes/kubernetes/pull/108309), [@zshihang](https://github.com/zshihang))...

- Fix a data race in authentication between AuthenticatedGroupAdder and cached token authenticator. ([#109969](https://github.com/kubernetes/kubernetes/pull/109969), [@sttts](https://github.com/sttts)) [SIG API Machinery and Auth]

- Added alpha-level support for the SuccessPolicy in Jobs.
   ([#123412](https://github.com/kubernetes/kubernetes/pull/123412), [@tenzen-y](https://github.com/tenzen-y))
- Added the `CEL` library for IP Addresses and CIDRs. This was made available for use starting from version `1.31`.

- `kube-controller-manager`: The `LegacyServiceAccountTokenCleanUp` feature gate is now `beta` and enabled by default. When enabled, legacy auto-generated service account token secrets are auto-labeled with a `kubernetes.io/legacy-token-invalid-since` label if the credentials have not been used in the time...