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CHANGELOG: Update directory for v1.21.0-alpha.2 release

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<!-- BEGIN MUNGE: GENERATED_TOC -->
- [v1.21.0-alpha.1](#v1210-alpha1)
- [Downloads for v1.21.0-alpha.1](#downloads-for-v1210-alpha1)
- [v1.21.0-alpha.2](#v1210-alpha2)
- [Downloads for v1.21.0-alpha.2](#downloads-for-v1210-alpha2)
- [Source Code](#source-code)
- [Client binaries](#client-binaries)
- [Server binaries](#server-binaries)
- [Node binaries](#node-binaries)
- [Changelog since v1.20.0](#changelog-since-v1200)
- [Changelog since v1.21.0-alpha.1](#changelog-since-v1210-alpha1)
- [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)
- [Deprecation](#deprecation)
- [API Change](#api-change)
- [Feature](#feature)
- [Documentation](#documentation)
- [Bug or Regression](#bug-or-regression)
- [Other (Cleanup or Flake)](#other-cleanup-or-flake)
- [Dependencies](#dependencies)
- [Added](#added)
- [Changed](#changed)
- [Removed](#removed)
- [v1.21.0-alpha.1](#v1210-alpha1)
- [Downloads for v1.21.0-alpha.1](#downloads-for-v1210-alpha1)
- [Source Code](#source-code-1)
- [Client binaries](#client-binaries-1)
- [Server binaries](#server-binaries-1)
- [Node binaries](#node-binaries-1)
- [Changelog since v1.20.0](#changelog-since-v1200)
- [Urgent Upgrade Notes](#urgent-upgrade-notes-1)
- [(No, really, you MUST read this before you upgrade)](#no-really-you-must-read-this-before-you-upgrade-1)
- [Changes by Kind](#changes-by-kind-1)
- [Deprecation](#deprecation-1)
- [API Change](#api-change-1)
- [Feature](#feature)
- [Bug or Regression](#bug-or-regression-1)
- [Other (Cleanup or Flake)](#other-cleanup-or-flake-1)
- [Uncategorized](#uncategorized)
- [Dependencies](#dependencies-1)
- [Added](#added-1)
- [Changed](#changed-1)
- [Removed](#removed-1)
<!-- END MUNGE: GENERATED_TOC -->
# v1.21.0-alpha.2
## Downloads for v1.21.0-alpha.2
### Source Code
filename | sha512 hash
-------- | -----------
[kubernetes.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes.tar.gz) | 6836f6c8514253fe0831fd171fc4ed92eb6d9a773491c8dc82b90d171a1b10076bd6bfaea56ec1e199c5f46c273265bdb9f174f0b2d99c5af1de4c99b862329e
[kubernetes-src.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-src.tar.gz) | d137694804741a05ab09e5f9a418448b66aba0146c028eafce61bcd9d7c276521e345ce9223ffbc703e8172041d58dfc56a3242a4df3686f24905a4541fcd306
### Client binaries
filename | sha512 hash
-------- | -----------
[kubernetes-client-darwin-amd64.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-client-darwin-amd64.tar.gz) | 9478b047a97717953f365c13a098feb7e3cb30a3df22e1b82aa945f2208dcc5cb90afc441ba059a3ae7aafb4ee000ec3a52dc65a8c043a5ac7255a391c875330
[kubernetes-client-linux-386.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-client-linux-386.tar.gz) | 44c8dd4b1ddfc256d35786c8abf45b0eb5f0794f5e310d2efc865748adddc50e8bf38aa71295ae8a82884cb65f2e0b9b0737b000f96fd8f2d5c19971d7c4d8e8
[kubernetes-client-linux-amd64.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-client-linux-amd64.tar.gz) | e1291989892769de6b978c17b8612b94da6f3b735a4d895100af622ca9ebb968c75548afea7ab00445869625dd0da3afec979e333afbb445805f5d31c1c13cc7
[kubernetes-client-linux-arm.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-client-linux-arm.tar.gz) | 3c4bcb8cbe73822d68a2f62553a364e20bec56b638c71d0f58679b4f4b277d809142346f18506914e694f6122a3e0f767eab20b7b1c4dbb79e4c5089981ae0f1
[kubernetes-client-linux-arm64.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-client-linux-arm64.tar.gz) | 9389974a790268522e187f5ba5237f3ee4684118c7db76bc3d4164de71d8208702747ec333b204c7a78073ab42553cbbce13a1883fab4fec617e093b05fab332
[kubernetes-client-linux-ppc64le.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-client-linux-ppc64le.tar.gz) | 63399e53a083b5af3816c28ff162c9de6b64c75da4647f0d6bbaf97afdf896823cb1e556f2abac75c6516072293026d3ff9f30676fd75143ac6ca3f4d21f4327
[kubernetes-client-linux-s390x.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-client-linux-s390x.tar.gz) | 50898f197a9d923971ff9046c9f02779b57f7b3cea7da02f3ea9bab8c08d65a9c4a7531a2470fa14783460f52111a52b96ebf916c0a1d8215b4070e4e861c1b0
[kubernetes-client-windows-386.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-client-windows-386.tar.gz) | a7743e839e1aa19f5ee20b6ee5000ac8ef9e624ac5be63bb574fad6992e4b9167193ed07e03c9bc524e88bfeed66c95341a38a03bff1b10bc9910345f33019f0
[kubernetes-client-windows-amd64.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-client-windows-amd64.tar.gz) | 5f1d19c230bd3542866d16051808d184e9dd3e2f8c001ed4cee7b5df91f872380c2bf56a3add8c9413ead9d8c369efce2bcab4412174df9b823d3592677bf74e
### Server binaries
filename | sha512 hash
-------- | -----------
[kubernetes-server-linux-amd64.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-server-linux-amd64.tar.gz) | ef2cac10febde231aeb6f131e589450c560eeaab8046b49504127a091cddc17bc518c2ad56894a6a033033ab6fc6e121b1cc23691683bc36f45fe6b1dd8e0510
[kubernetes-server-linux-arm.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-server-linux-arm.tar.gz) | d11c9730307f08e80b2b8a7c64c3e9a9e43c622002e377dfe3a386f4541e24adc79a199a6f280f40298bb36793194fd44ed45defe8a3ee54a9cb1386bc26e905
[kubernetes-server-linux-arm64.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-server-linux-arm64.tar.gz) | 28f8c32bf98ee1add7edf5d341c3bac1afc0085f90dcbbfb8b27a92087f13e2b53c327c8935ee29bf1dc3160655b32bbe3e29d5741a8124a3848a777e7d42933
[kubernetes-server-linux-ppc64le.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-server-linux-ppc64le.tar.gz) | 99ae8d44b0de3518c27fa8bbddd2ecf053dfb789fb9d65f8a4ecf4c8331cf63d2f09a41c2bcd5573247d5f66a1b2e51944379df1715017d920d521b98589508a
[kubernetes-server-linux-s390x.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-server-linux-s390x.tar.gz) | f8c0e954a2dfc6845614488dadeed069cc7f3f08e33c351d7a77c6ef97867af590932e8576d12998a820a0e4d35d2eee797c764e2810f09ab1e90a5acaeaad33
### Node binaries
filename | sha512 hash
-------- | -----------
[kubernetes-node-linux-amd64.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-node-linux-amd64.tar.gz) | c5456d50bfbe0d75fb150b3662ed7468a0abd3970792c447824f326894382c47bbd3a2cc5a290f691c8c09585ff6fe505ab86b4aff2b7e5ccee11b5e6354ae6c
[kubernetes-node-linux-arm.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-node-linux-arm.tar.gz) | 335b5cd8672e053302fd94d932fb2fa2e48eeeb1799650b3f93acdfa635e03a8453637569ab710c46885c8317759f4c60aaaf24dca9817d9fa47500fe4a3ca53
[kubernetes-node-linux-arm64.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-node-linux-arm64.tar.gz) | 3ee87dbeed8ace9351ac89bdaf7274dd10b4faec3ceba0825f690ec7a2bb7eb7c634274a1065a0939eec8ff3e43f72385f058f4ec141841550109e775bc5eff9
[kubernetes-node-linux-ppc64le.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-node-linux-ppc64le.tar.gz) | 6956f965b8d719b164214ec9195fdb2c776b907fe6d2c524082f00c27872a73475927fd7d2a994045ce78f6ad2aa5aeaf1eb5514df1810d2cfe342fd4e5ce4a1
[kubernetes-node-linux-s390x.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-node-linux-s390x.tar.gz) | 3b643aa905c709c57083c28dd9e8ffd88cb64466cda1499da7fc54176b775003e08b9c7a07b0964064df67c8142f6f1e6c13bfc261bd65fb064049920bfa57d0
[kubernetes-node-windows-amd64.tar.gz](https://dl.k8s.io/v1.21.0-alpha.2/kubernetes-node-windows-amd64.tar.gz) | b2e6d6fb0091f2541f9925018c2bdbb0138a95bab06b4c6b38abf4b7144b2575422263b78fb3c6fd09e76d90a25a8d35a6d4720dc169794d42c95aa22ecc6d5f
## Changelog since v1.21.0-alpha.1
## Urgent Upgrade Notes
### (No, really, you MUST read this before you upgrade)
- Remove storage metrics `storage_operation_errors_total`, since we already have `storage_operation_status_count`.And add new field `status` for `storage_operation_duration_seconds`, so that we can know about all status storage operation latency. ([#98332](https://github.com/kubernetes/kubernetes/pull/98332), [@JornShen](https://github.com/JornShen)) [SIG Instrumentation and Storage]
## Changes by Kind
### Deprecation
- Remove the TokenRequest and TokenRequestProjection feature gates ([#97148](https://github.com/kubernetes/kubernetes/pull/97148), [@wawa0210](https://github.com/wawa0210)) [SIG Node]
- Removing experimental windows container hyper-v support with Docker ([#97141](https://github.com/kubernetes/kubernetes/pull/97141), [@wawa0210](https://github.com/wawa0210)) [SIG Node and Windows]
- The `export` query parameter (inconsistently supported by API resources and deprecated in v1.14) is fully removed. Requests setting this query parameter will now receive a 400 status response. ([#98312](https://github.com/kubernetes/kubernetes/pull/98312), [@deads2k](https://github.com/deads2k)) [SIG API Machinery, Auth and Testing]
### API Change
- Enable SPDY pings to keep connections alive, so that `kubectl exec` and `kubectl portforward` won't be interrupted. ([#97083](https://github.com/kubernetes/kubernetes/pull/97083), [@knight42](https://github.com/knight42)) [SIG API Machinery and CLI]
### Documentation
- Official support to build kubernetes with docker-machine / remote docker is removed. This change does not affect building kubernetes with docker locally. ([#97935](https://github.com/kubernetes/kubernetes/pull/97935), [@adeniyistephen](https://github.com/adeniyistephen)) [SIG Release and Testing]
- Set kubelet option `--volume-stats-agg-period` to negative value to disable volume calculations. ([#96675](https://github.com/kubernetes/kubernetes/pull/96675), [@pacoxu](https://github.com/pacoxu)) [SIG Node]
### Bug or Regression
- Clean ReplicaSet by revision instead of creation timestamp in deployment controller ([#97407](https://github.com/kubernetes/kubernetes/pull/97407), [@waynepeking348](https://github.com/waynepeking348)) [SIG Apps]
- Ensure that client-go's EventBroadcaster is safe (non-racy) during shutdown. ([#95664](https://github.com/kubernetes/kubernetes/pull/95664), [@DirectXMan12](https://github.com/DirectXMan12)) [SIG API Machinery]
- Fix azure file migration issue ([#97877](https://github.com/kubernetes/kubernetes/pull/97877), [@andyzhangx](https://github.com/andyzhangx)) [SIG Auth, Cloud Provider and Storage]
- Fix kubelet from panic after getting the wrong signal ([#98200](https://github.com/kubernetes/kubernetes/pull/98200), [@wzshiming](https://github.com/wzshiming)) [SIG Node]
- Fix repeatedly aquire the inhibit lock ([#98088](https://github.com/kubernetes/kubernetes/pull/98088), [@wzshiming](https://github.com/wzshiming)) [SIG Node]
- Fixed a bug that the kubelet cannot start on BtrfS. ([#98042](https://github.com/kubernetes/kubernetes/pull/98042), [@gjkim42](https://github.com/gjkim42)) [SIG Node]
- Fixed an issue with garbage collection failing to clean up namespaced children of an object also referenced incorrectly by cluster-scoped children ([#98068](https://github.com/kubernetes/kubernetes/pull/98068), [@liggitt](https://github.com/liggitt)) [SIG API Machinery and Apps]
- Fixed no effect namespace when exposing deployment with --dry-run=client. ([#97492](https://github.com/kubernetes/kubernetes/pull/97492), [@masap](https://github.com/masap)) [SIG CLI]
- Fixing a bug where a failed node may not have the NoExecute taint set correctly ([#96876](https://github.com/kubernetes/kubernetes/pull/96876), [@howieyuen](https://github.com/howieyuen)) [SIG Apps and Node]
- Indentation of `Resource Quota` block in kubectl describe namespaces output gets correct. ([#97946](https://github.com/kubernetes/kubernetes/pull/97946), [@dty1er](https://github.com/dty1er)) [SIG CLI]
- KUBECTL_EXTERNAL_DIFF now accepts equal sign for additional parameters. ([#98158](https://github.com/kubernetes/kubernetes/pull/98158), [@dougsland](https://github.com/dougsland)) [SIG CLI]
- Kubeadm: fix a bug where "kubeadm join" would not properly handle missing names for existing etcd members. ([#97372](https://github.com/kubernetes/kubernetes/pull/97372), [@ihgann](https://github.com/ihgann)) [SIG Cluster Lifecycle]
- Kubelet should ignore cgroup driver check on Windows node. ([#97764](https://github.com/kubernetes/kubernetes/pull/97764), [@pacoxu](https://github.com/pacoxu)) [SIG Node and Windows]
- Make podTopologyHints protected by lock ([#95111](https://github.com/kubernetes/kubernetes/pull/95111), [@choury](https://github.com/choury)) [SIG Node]
- Readjust kubelet_containers_per_pod_count bucket ([#98169](https://github.com/kubernetes/kubernetes/pull/98169), [@wawa0210](https://github.com/wawa0210)) [SIG Instrumentation and Node]
- Scores from InterPodAffinity have stronger differentiation. ([#98096](https://github.com/kubernetes/kubernetes/pull/98096), [@leileiwan](https://github.com/leileiwan)) [SIG Scheduling]
- Specifying the KUBE_TEST_REPO environment variable when e2e tests are executed will instruct the test infrastructure to load that image from a location within the specified repo, using a predefined pattern. ([#93510](https://github.com/kubernetes/kubernetes/pull/93510), [@smarterclayton](https://github.com/smarterclayton)) [SIG Testing]
- Static pods will be deleted gracefully. ([#98103](https://github.com/kubernetes/kubernetes/pull/98103), [@gjkim42](https://github.com/gjkim42)) [SIG Node]
- Use network.Interface.VirtualMachine.ID to get the binded VM
Skip standalone VM when reconciling LoadBalancer ([#97635](https://github.com/kubernetes/kubernetes/pull/97635), [@nilo19](https://github.com/nilo19)) [SIG Cloud Provider]
### Other (Cleanup or Flake)
- Kubeadm: change the default image repository for CI images from 'gcr.io/kubernetes-ci-images' to 'gcr.io/k8s-staging-ci-images' ([#97087](https://github.com/kubernetes/kubernetes/pull/97087), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]
- Migrate generic_scheduler.go and types.go to structured logging. ([#98134](https://github.com/kubernetes/kubernetes/pull/98134), [@tanjing2020](https://github.com/tanjing2020)) [SIG Scheduling]
- Migrate proxy/winuserspace/proxier.go logs to structured logging ([#97941](https://github.com/kubernetes/kubernetes/pull/97941), [@JornShen](https://github.com/JornShen)) [SIG Network]
- Migrate staging/src/k8s.io/apiserver/pkg/audit/policy/reader.go logs to structured logging. ([#98252](https://github.com/kubernetes/kubernetes/pull/98252), [@lala123912](https://github.com/lala123912)) [SIG API Machinery and Auth]
- Migrate staging\src\k8s.io\apiserver\pkg\endpoints logs to structured logging ([#98093](https://github.com/kubernetes/kubernetes/pull/98093), [@lala123912](https://github.com/lala123912)) [SIG API Machinery]
- Node ([#96552](https://github.com/kubernetes/kubernetes/pull/96552), [@pandaamanda](https://github.com/pandaamanda)) [SIG Apps, Cloud Provider, Node and Scheduling]
- The kubectl alpha debug command was scheduled to be removed in v1.21. ([#98111](https://github.com/kubernetes/kubernetes/pull/98111), [@pandaamanda](https://github.com/pandaamanda)) [SIG CLI]
- Update cri-tools to [v1.20.0](https://github.com/kubernetes-sigs/cri-tools/releases/tag/v1.20.0) ([#97967](https://github.com/kubernetes/kubernetes/pull/97967), [@rajibmitra](https://github.com/rajibmitra)) [SIG Cloud Provider]
- Windows nodes on GCE will take longer to start due to dependencies installed at node creation time. ([#98284](https://github.com/kubernetes/kubernetes/pull/98284), [@pjh](https://github.com/pjh)) [SIG Cloud Provider]
## Dependencies
### Added
_Nothing has changed._
### Changed
- github.com/google/cadvisor: [v0.38.6 → v0.38.7](https://github.com/google/cadvisor/compare/v0.38.6...v0.38.7)
- k8s.io/gengo: 83324d8 → b6c5ce2
### Removed
_Nothing has changed._
# v1.21.0-alpha.1