- Kube-apiserver: resolved a regression that treated `304 Not Modified` responses from aggregated API servers as internal errors ([#112530](https://github.com/kubernetes/kubernetes/pull/112530), [@liggitt](https://github.com/liggitt)) [SIG API Machinery]

- Kube-apiserver: The `rbac.authorization.k8s.io/v1alpha1` API version is removed; use the `rbac.authorization.k8s.io/v1` API, available since v1.8. The `scheduling.k8s.io/v1alpha1` API version is removed; use the `scheduling.k8s.io/v1` API, available since v1.14. ([#104248](https://github.com/kubernetes/kubernetes/pull/104248), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, Auth, Network and Testing]

  - [Known Issues](#known-issues)
    - [Summary API in kubelet doesn't have accelerator metrics](#summary-api-in-kubelet-doesnt-have-accelerator-metrics)
  - [Urgent Upgrade Notes](#urgent-upgrade-notes)
    - [(No, really, you MUST read this before you upgrade)](#no-really-you-must-read-this-before-you-upgrade)
  - [Changes by Kind](#changes-by-kind-14)
    - [Deprecation](#deprecation)
    - [API Change](#api-change-4)
    - [Feature](#feature-6)

      - [add-ons:](#add-ons)
      - [kube-scheduler:](#kube-scheduler)
      - [Other deprecations:](#other-deprecations)
    - [API Change](#api-change-6)
      - [New API types/versions:](#new-api-typesversions)
      - [New API fields:](#new-api-fields)
      - [Other API changes:](#other-api-changes)
      - [Configuration file changes:](#configuration-file-changes)
      - [kube-apiserver:](#kube-apiserver-2)

### API Change

- Add ServedVersions field to StorageVersion API ([#118386](https://github.com/kubernetes/kubernetes/pull/118386), [@Richabanker](https://github.com/Richabanker)) [SIG API Machinery and Testing]

  - pod eviction API calls returned spurious precondition errors and required a second evict API call to succeed
  - dry-run eviction API calls persisted a DisruptionTarget condition into the pod being evicted ([#116554](https://github.com/kubernetes/kubernetes/pull/116554), [@atiratree](https://github.com/atiratree)) [SIG API Machinery and Testing]

- Fix API comment for the Job Ready field in status ([#121765](https://github.com/kubernetes/kubernetes/pull/121765), [@mimowo](https://github.com/mimowo)) [SIG API Machinery and Apps]
- Fix API comments for the FailIndex Job pod failure policy action. ([#121764](https://github.com/kubernetes/kubernetes/pull/121764), [@mimowo](https://github.com/mimowo)) [SIG API Machinery and Apps]

### Feature

- The `StorageVersionMigration` API, which was previously available as a Custom Resource Definition (CRD), is now a built-in API in Kubernetes. ([#123344](https://github.com/kubernetes/kubernetes/pull/123344), [@nilekhc](https://github.com/nilekhc)) [SIG API Machinery, Apps, Auth, CLI and Testing]

### API Change

- Add auth API to get self subject attributes (new selfsubjectreviews API is added). 
  The corresponding command for kubctl is provided - `kubectl auth whoami`. ([#111333](https://github.com/kubernetes/kubernetes/pull/111333), [@nabokihms](https://github.com/nabokihms)) [SIG API Machinery, Auth, CLI and Testing]

  - [Notable Features](#notable-features)
    - [Stable](#stable)
    - [Beta](#beta)
    - [CLI Improvements](#cli-improvements)
  - [API Changes](#api-changes)
  - [Other notable changes](#other-notable-changes-1)
    - [API Machinery](#api-machinery)
    - [Apps](#apps)
    - [Auth](#auth)
    - [CLI](#cli)
    - [Cloud Provider](#cloud-provider)
    - [Cluster Lifecycle](#cluster-lifecycle-1)