* Introduce API for watch bookmark events. ([#74074](https://github.com/kubernetes/kubernetes/pull/74074), [@wojtek-t](https://github.com/wojtek-t))

- 'Priority and Fairness has introduced a new feature called _borrowing_ that allows an API priority level
  to borrow a number of seats from other priority level(s). As a cluster operator, you can enable borrowing
  for a certain priority level configuration object via the two newly introduced fields `lendablePercent`, and

* Bug fixes

### SIG Storage

Sig Storage graduated two features that had been introduced in previous versions and introduced three new features in an alpha state.

  which is not allowed. ([#121667](https://github.com/kubernetes/kubernetes/pull/121667), [@kerthcet](https://github.com/kerthcet)) [SIG Scheduling]
- Fixes a kube-apiserver log volume regression bug in default 1.27 configurations (introduced in 1.26, activated by the AggregatedDiscoveryEndpoint feature enablement in 1.27) ([#122096](https://github.com/kubernetes/kubernetes/pull/122096), [@ritazh](https://github.com/ritazh)) [SIG API Machinery]

- Introduced a feature gate mechanism to `client-go`. Depending on the actual implementation, users can control features via environmental variables or command line options. ([#122555](https://github.com/kubernetes/kubernetes/pull/122555), [@p0lyn0mial](https://github.com/p0lyn0mial))

- Introduced dynamic volume provisioning shim for CSI migration ([#73653](https://github.com/kubernetes/kubernetes/pull/73653), [@ddebroy](https://github.com/ddebroy))

The Kubernetes Volume Snapshot feature is now beta in Kubernetes v1.17. It was introduced as alpha in Kubernetes v1.12, with a second alpha with breaking changes in Kubernetes v1.13.

### CSI Migration Beta

The Kubernetes in-tree storage plugin to Container Storage Interface (CSI) migration infrastructure is now beta in Kubernetes v1.17. CSI migration was introduced as alpha in Kubernetes v1.14.

## Known Issues

- Check for newer resize fields when deciding recovery feature's status in kubelet ([#131439](https://github.com/kubernetes/kubernetes/pull/131439), [@gnufied](https://github.com/gnufied)) [SIG Storage]

where Portworx volume driver wasn't passing namespace and annotations to the Portworx Create API. ([#59607](https://github.com/kubernetes/kubernetes/pull/59607), [@harsh-px](https://github.com/harsh-px))

* Addressed breaking changes introduced by new 0.2.0 release of CSI spec. Specifically, csi.Version was removed from all API calls and CcontrollerProbe and NodeProbe were consolidated into a single Probe API call. ([#59209](https://github.com/kubernetes/kubernetes/pull/59209), [@sbez...