* Introduce a RuntimeClass v1beta1 API. This new beta API renames `runtimeHandler` to `handler`, makes it a required field, and cuts out the spec (handler is a top-level field).
* Transition CSINodeInfo and CSIDriver alpha CRDs to in-tree CSINode and CSIDriver core storage v1beta1 APIs. ([#74283](https://github.com/kubernetes/kubernetes/pull/74283), [@xing-yang](https://github.com/xing-yang))

- Volume Cloning: Duplicate a PersistentVolumeClaim and underlying storage volume using the Kubernetes API via CSI.
- CSIDriver Kubernetes API Object: Simplifies CSI driver discovery and allows CSI Drivers to customize Kubernetes behavior.

SIG Storage is also introducing the following new storage features as alpha in Kubernetes 1.18:

    - [Non-recursive Volume Ownership (FSGroup) graduates to Beta](#non-recursive-volume-ownership-fsgroup-graduates-to-beta)
    - [CSIDriver policy for FSGroup graduates to Beta](#csidriver-policy-for-fsgroup-graduates-to-beta)
    - [Security Improvements for CSI Drivers (Alpha)](#security-improvements-for-csi-drivers-alpha)

- The scheduler implements QueueingHint in VolumeBinding plugin's CSIDriver event, which enhances the throughput of scheduling. ([#125171](https://github.com/kubernetes/kubernetes/pull/125171), [@YamasouA](https://github.com/YamasouA)) [SIG Scheduling and Storage]

- CSIPersistentVolume feature, i.e. PersistentVolumes with CSIPersistentVolumeSource, is GA.  ([#69929](https://github.com/kubernetes/kubernetes/pull/69929), [@jsafrane](https://github.com/jsafrane))
- Fixed CSIDriver API object to allow missing fields. ([#69331](https://github.com/kubernetes/kubernetes/pull/69331), [@jsafrane](https://github.com/jsafrane))

- Users are now allowed to mutate `FSGroupPolicy` and `PodInfoOnMount` in `CSIDriver.Spec`. ([#116209](https://github.com/kubernetes/kubernetes/pull/116209), [@haoruan](https://github.com/haoruan))

- The `CSIDriver.Spec.StorageCapacity` can now be modified. ([#101789](https://github.com/kubernetes/kubernetes/pull/101789), [@pohly](https://github.com/pohly))

* Fixed panic on iSCSI volume tear down. ([#69140](https://github.com/kubernetes/kubernetes/pull/69140), [@jsafrane](https://github.com/jsafrane))
* Fixed CSIDriver API object to allow missing fields. ([#69331](https://github.com/kubernetes/kubernetes/pull/69331), [@jsafrane](https://github.com/jsafrane))

* a CSI driver that supports ephemeral inline volumes must explicitly declare that by providing a CSIDriver object where the new "mode" field is set to "ephemeral" or "persistent+ephemeral" ([#80568](https://github.com/kubernetes/kubernetes/pull/80568), [@pohly](https://github.com/pohly))

- The apiserver/v1alph1 #EgressSelectorConfiguration API is now beta. ([#88502](https://github.com/kubernetes/kubernetes/pull/88502), [@caesarxuchao](https://github.com/caesarxuchao)) [SIG API Machinery]
- The storage.k8s.io/CSIDriver has moved to GA, and is now available for use. ([#84814](https://github.com/kubernetes/kubernetes/pull/84814), [@huffmanca](https://github.com/huffmanca)) [SIG API Machinery, Apps, Auth, Node, Scheduling, Storage and Testing]