`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`.

 - `kubeadm join` now delegates TLS Bootstrapping to the kubelet itself, instead
 of reimplementing the process. `kubeadm join` writes the bootstrap kubeconfig
 file to `/etc/kubernetes/bootstrap-kubelet.conf`.

#### Defaults

- Adds metrics for the delegated authenticator used by extension APIs that delegate authentication logic to the Kube API server. ([#99364](https://github.com/kubernetes/kubernetes/pull/99364), [@p0lyn0mial](https://github.com/p0lyn0mial))

- Secure serving on port 10258 to cloud-controller-manager (configurable via `--secure-port`) is now enabled. Delegated authentication and authorization are to be configured using the same flags as for aggregated API servers. Without configuration, the secure port will only allow access to `/healthz`. ([#67069](https://github.com/kubernetes/kubernetes/pull/67069),...

- Apiservers based on k8s.io/apiserver with delegated authn based on cluster authentication will automatically update to new authentication information when the authoritative configmap is updated. ([#85004](https://github.com/kubernetes/kubernetes/pull/85004), [@deads2k](https://github.com/deads2k))...

- Fix the overestimated cost of delegated API requests in kube-apiserver API priority&fairness ([#109216](https://github.com/kubernetes/kubernetes/pull/109216), [@wojtek-t](https://github.com/wojtek-t)) [SIG API Machinery]

- `system:kube-controller-manager` and `system:kube-scheduler` users are now permitted to perform delegated authentication/authorization checks by default RBAC policy ([#72491](https://github.com/kubernetes/kubernetes/pull/72491), [@liggitt](https://github.com/liggitt))

* Add support for finalizers in federated configmaps (deletes configmaps from underlying clusters). ([#40464](https://github.com/kubernetes/kubernetes/pull/40464), [@csbell](https://github.com/csbell))

* Authors of aggregated API servers must not rely on authorization being done by the kube-apiserver, and must do delegated authorization in addition. ([#61349](https://github.com/kubernetes/kubernetes/pull/61349), [@sttts](https://github.com/sttts))

- New addon in addon manager that automatically installs CSI CRDs if CSIDriverRegistry or CSINodeInfo feature gates are true. ([#70193](https://github.com/kubernetes/kubernetes/pull/70193), [@saad-ali](https://github.com/saad-ali))
- Delegated authorization can now allow unrestricted access for `system:masters` like the main kube-apiserver ([#70671](https://github.com/kubernetes/kubernetes/pull/70671), [@deads2k](https://github.com/deads2k))

### API Change

- Added (alpha) support for the `managedBy` field on Jobs. Jobs with a custom value of this field - any value other than `kubernetes.io/job-controller` - were skipped by the job controller, and their reconciliation was delegated to an external controller, indicated by the value of the field. Jobs that didn't have this field at all, or where the field value was the reserved string `kubernetes.io/job-controller`, were reconciled by the built-in job controller.