- Promote NodeLease feature to GA.

- kubelet: Users can now enable the alpha NodeLease feature gate to have the Kubelet create and periodically renew a Lease in the kube-node-lease namespace. The lease duration defaults to 40s, and can be configured via the kubelet.config.k8s.io/v1beta1.KubeletConfiguration's NodeLeaseDurationSeconds...

### Node

- Remove PIDs cgroup controller requirement when related feature gates are disabled
  ([#79073](https://github.com/kubernetes/kubernetes/pull/79073), [@rafatio](https://github.com/rafatio))
- Fix kubelet NodeLease potential performance issues. Kubelet now will try to update lease using cached one instead of get from API Server every time. ([#81174](https://github.com/kubernetes/kubernetes/pull/81174), [@answer1991](https://github.com/answer1991))

- Remove `NodeLease` feature gate that was graduated and locked to stable in 1.17 release. ([#105222](https://github.com/kubernetes/kubernetes/pull/105222), [@cyclinder](https://github.com/cyclinder))

- Added alpha support for ephemeral CSI inline volumes that are embedded in pod specs. ([#74086](https://github.com/kubernetes/kubernetes/pull/74086), [@vladimirvivien](https://github.com/vladimirvivien))
- The NodeLease feature gate has been promoted to Beta, and is enabled by default ([#72096](https://github.com/kubernetes/kubernetes/pull/72096), [@wojtek-t](https://github.com/wojtek-t))

## API Changes

### SIG Node