`settings/v1alpha1`, and `scheduling/v1alpha1` APIs are disabled by default.

* The `system:node` role is no longer automatically granted to the `system:nodes` group in new clusters. The role gives broad read access to resources, including secrets and configmaps. Use the `Node` authorization mode to authorize the nodes in new clusters. To continue providing the `system:node` role to the members of the `system:nodes` group, create an installation-specific `ClusterRoleBinding` in the installation....

- **Auth**
  - [alpha] Further polishing of the Role-based access control alpha API including a default set of cluster roles. ([docs](http://kubernetes.io/docs/admin/authorization/)) ([kubernetes/features#2](https://github.com/kubernetes/enhancements/issues/2))

		err = sys.store.PolicyMappingNotificationHandler(ctx, user, true, regUser)
	}
	return err
}

// HasRolePolicy - returns if a role policy is configured for IAM.
func (sys *IAMSys) HasRolePolicy() bool {
	return len(sys.rolesMap) > 0
}

// GetRolePolicy - returns policies associated with a role ARN.
func (sys *IAMSys) GetRolePolicy(arnStr string) (arn.ARN, string, error) {
	roleArn, err := arn.Parse(arnStr)
	if err != nil {

- The built-in system:csi-external-provisioner and system:csi-external-attacher cluster roles are removed as of 1.17 release ([#84282](https://github.com/kubernetes/kubernetes/pull/84282), [@tedyu](https://github.com/tedyu))

    it keeps your `HeldCertificate` and its chain. On the client it keeps the root certificates
    that are trusted to sign a server's certificate chain. `HandshakeCertificates` also works with
    mutual TLS where these roles are reversed.

    These classes make it possible to enable HTTPS in MockWebServer in [just a few lines of
    code][https_server_sample].

* Fix SelectorSpreadPriority scheduler to match all selectors when distributing pods. ([#72801](https://github.com/kubernetes/kubernetes/pull/72801), [@Ramyak](https://github.com/Ramyak))
* Add bootstrap service account & cluster roles for node-lifecycle-controller, cloud-node-lifecycle-controller, and cloud-node-controller.   ([#72764](https://github.com/kubernetes/kubernetes/pull/72764), [@andrewsykim](https://github.com/andrewsykim))

* Alpha version of "Role Based Access Control" API. ([#25634](https://github.com/kubernetes/kubernetes/pull/25634), [@ericchiang](https://github.com/ericchiang))

#### AWS

  - The built-in `system:aws-cloud-provider` cluster role is deprecated and will not be auto-created in a future release. Deployments using the AWS...

- Kubeadm: stop applying the `node-role.kubernetes.io/master:NoSchedule` taint to control plane nodes for new clusters. Remove the taint from existing control plane nodes during "kubeadm upgrade apply" ([#110095](https://github.com/kubernetes/kubernetes/pull/110095), [@neolit123](https:...