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

* 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.

- kubeadm: Allow users to skip the kube-proxy init addon phase during init and still be able to join a cluster and perform some other minor operations (but not upgrade). ([#82248](https://github.com/kubernetes/kubernetes/pull/82248), [@rosti](https://github.com/rosti))

pkg syscall (netbsd-arm64-cgo), type BpfVersion struct
pkg syscall (netbsd-arm64-cgo), type BpfVersion struct, Major uint16
pkg syscall (netbsd-arm64-cgo), type BpfVersion struct, Minor uint16
pkg syscall (netbsd-arm64-cgo), type Cmsghdr struct
pkg syscall (netbsd-arm64-cgo), type Cmsghdr struct, Len uint32
pkg syscall (netbsd-arm64-cgo), type Cmsghdr struct, Level int32

### SIG Network

For 1.13, the areas of focus were in IPv6, DNS improvements and some smaller items:

pkg syscall (freebsd-arm64), type BpfVersion struct
pkg syscall (freebsd-arm64), type BpfVersion struct, Major uint16
pkg syscall (freebsd-arm64), type BpfVersion struct, Minor uint16
pkg syscall (freebsd-arm64), type BpfZbuf struct
pkg syscall (freebsd-arm64), type BpfZbuf struct, Bufa *uint8
pkg syscall (freebsd-arm64), type BpfZbuf struct, Bufb *uint8

pkg syscall (darwin-arm64), type BpfStat struct, Recv uint32
pkg syscall (darwin-arm64), type BpfVersion struct
pkg syscall (darwin-arm64), type BpfVersion struct, Major uint16
pkg syscall (darwin-arm64), type BpfVersion struct, Minor uint16
pkg syscall (darwin-arm64), type Cmsghdr struct
pkg syscall (darwin-arm64), type Cmsghdr struct, Len uint32
pkg syscall (darwin-arm64), type Cmsghdr struct, Level int32

* Bump cluster autoscaler to v0.5.4, which fixes scale down issues with pods ignoring SIGTERM. ([#45483](https://github.com/kubernetes/kubernetes/pull/45483), [@mwielgus](https://github.com/mwielgus))
* Fixes and minor cleanups to pod (anti)affinity predicate ([#45098](https://github.com/kubernetes/kubernetes/pull/45098), [@wojtek-t](https://github.com/wojtek-t))

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