- The RuntimeClass scheduler can now simplify steering Linux or Windows pods to appropriate nodes
- All Windows nodes now get the new label `node.kubernetes.io/windows-build` that reflects the Windows major, minor, and build number that are needed to match compatibility between Windows containers and Windows worker nodes.


## Deprecations and Removals

* fixes configuration error when upgrading kubeadm from 1.9 to 1.10+ ([#62568](https://github.com/kubernetes/kubernetes/pull/62568), [@liztio](https://github.com/liztio))
    * enforces  kubeadm  upgrading kubernetes from the same major and minor versions as the kubeadm binary.
* Bugfix allowing use of IP-aliases with custom-mode network in GCE setup scripts. ([#62172](https://github.com/kubernetes/kubernetes/pull/62172), [@shyamjvs](https://github.com/shyamjvs))

pkg syscall (freebsd-386-cgo), type BpfVersion struct
pkg syscall (freebsd-386-cgo), type BpfVersion struct, Major uint16
pkg syscall (freebsd-386-cgo), type BpfVersion struct, Minor uint16
pkg syscall (freebsd-386-cgo), type BpfZbuf struct
pkg syscall (freebsd-386-cgo), type BpfZbuf struct, Bufa *uint8
pkg syscall (freebsd-386-cgo), type BpfZbuf struct, Bufb *uint8

- Kubectl version changed to write a warning message to stderr if the client and server version difference exceeds the supported version skew of +/-1 minor version. ([#98250](https://github.com/kubernetes/kubernetes/pull/98250), [@brianpursley](https://github.com/brianpursley)) [SIG CLI]

a.prod.fastly.net
a.se
a.ssl.fastly.net
a2hosted.com
aa.no
aaa
aaa.pro
aaa.vodka
aarborte.no
aarp
ab.ca
abashiri.hokkaido.jp
abb
abbott
abbvie
abc
abc.br
abeno.osaka.jp
abiko.chiba.jp
abira.hokkaido.jp
abkhazia.su
able
abo.pa
abogado
abr.it
abruzzo.it
abu.yamaguchi.jp
abudhabi
ac
ac.ae
ac.at
ac.be
ac.ci
ac.cn
ac.cr
ac.cy
ac.fj

* etcd3: make gets for previous value in watch serialize-able ([#34089](https://github.com/kubernetes/kubernetes/pull/34089), [@wojtek-t](https://github.com/wojtek-t))
* etcd3: minor cleanups ([#34234](https://github.com/kubernetes/kubernetes/pull/34234), [@wojtek-t](https://github.com/wojtek-t))

* Protobuf serialization does not distinguish between `[]` and `null`.

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* Add automatic etcd 3.2->3.1 and 3.1->3.0 minor version rollback support to gcr.io/google_container/etcd images. For HA clusters, all members must be stopped before performing a rollback. ([#59298](https://github.com/kubernetes/kubernetes/pull/59298), [@jpbetz](https://github.com/jpbetz))

 - Performance improvements for collections of metrics and summary

### Increase the Kubernetes support window to one year

As of Kubernetes 1.19, bugfix support via patch releases for a Kubernetes minor release has increased from 9 months to 1 year.