// +optional
  optional string path = 2;

  // user is Optional: User is the rados user name, default is admin
  // More info: https://examples.k8s.io/volumes/cephfs/README.md#how-to-use-it
  // +optional
  optional string user = 3;

  // secretFile is Optional: SecretFile is the path to key ring for User, default is /etc/ceph/user.secret
  // More info: https://examples.k8s.io/volumes/cephfs/README.md#how-to-use-it

- the following deprecated APIs can no longer be served:
  - All resources under `apps/v1beta1` and `apps/v1beta2` - use `apps/v1` instead
  - `daemonsets`, `deployments`, `replicasets` resources under `extensions/v1beta1` - use `apps/v1` instead
  - `networkpolicies` resources under `extensions/v1beta1` - use `networking.k8s.io/v1` instead

- Adds feature gate `KubeletInUserNamespace` which enables support for running kubelet in a user namespace.
  
  The user namespace has to be created before running kubelet.
  All the node components such as CRI need to be running in the same user namespace.
  

### SIG Cluster Lifecycle

[SIG Cluster Lifecycle][] is responsible for the user experience of deploying,
upgrading, and deleting clusters.

For the 1.8 release, SIG Cluster Lifecycle continued to focus on expanding the
capabilities of kubeadm, which is both a user-facing tool to manage clusters
and a building block for higher-level provisioning systems. Starting

- Kubeadm: graduate the command `kubeadm alpha kubeconfig user` to `kubeadm kubeconfig user`. The `kubeadm alpha kubeconfig user` command is deprecated now. ([#97583](https://github.com/kubernetes/kubernetes/pull/97583), [@knight42](https://github.com/knight42)) [SIG Cluster Lifecycle]

* To create or update an RBAC RoleBinding or ClusterRoleBinding object, a user must: ([#39383](https://github.com/kubernetes/kubernetes/pull/39383), [@liggitt](https://github.com/liggitt))

    String USER_CODE_REQUEST_PARAMETER = "user.code.request.parameter";

    /** The key of the configuration. e.g. 20 */
    String USER_CODE_MIN_LENGTH = "user.code.min.length";

    /** The key of the configuration. e.g. 100 */
    String USER_CODE_MAX_LENGTH = "user.code.max.length";

    /** The key of the configuration. e.g. [a-zA-Z0-9_]+ */
    String USER_CODE_PATTERN = "user.code.pattern";

- If the user specifies an invalid timeout in the request URL, the request will be aborted with an HTTP 400.

- kube-dns add-on:
  - All containers are now being executed under more restrictive privileges.
  - Most of the containers now run as non-root user and has the root filesystem set as read-only.
  - The remaining container running as root only has the minimum Linux capabilities it requires to run.

* Add MAX_PODS_PER_NODE env so that GCE/GKE user can use it to specify the default max pods per node for the cluster. IP_ALIAS_SIZE will be changed accordingly. Must have ip alias enabled. ([#63451](https://github.com/kubernetes/kubernetes/pull/63451), [@grayluck](https://github.com/grayluck))