* You must now specify `Node.Spec.ConfigSource.ConfigMap.KubeletConfigKey` when using dynamic Kubelet config to tell the Kubelet which key of the `ConfigMap` identifies its config file. ([#59847](https://github.com/kubernetes/kubernetes/pull/59847), [@mtaufen](https://github.com/mtaufen))

  attempted first, and if it fails with a corrupt resource error then it triggers unsafe delete.
  In addition, when this feature is enabled, the 'details' field of 'Status' from the LIST response
  includes information that identifies the corrupt object(s).
  NOTE: unsafe deletion ignores finalizer constraints, and skips precondition checks.
  WARNING: this may break the workload associated with the resource being unsafe-deleted, if it relies on

#### Cluster Discovery/Bootstrap

* [beta] The authentication and verification mechanism called Bootstrap Tokens is improved. Use Bootstrap Tokens to easily add new node identities to a cluster. ([#130](https://github.com/kubernetes/enhancements/issues/130), [@luxas](https://github.com/luxas), [@jbeda](https://github.com/jbeda)).

#### Multi-platform

- User Assigned MSI (https://docs.microsoft.com/en-us/azure/active-directory/managed-service-identity/overview), which provides for managed identities, is now suppored for Kubernetes clusters on Azure. ([#66180](https://github.com/kubernetes/kubernetes/pull/66180), [@kkmsft](https://github.com/kkmsft))