- Ephemeral containers graduated to beta and are now available by default. ([#105405](https://github.com/kubernetes/kubernetes/pull/105405), [@verb](https://github.com/verb))

* Adds a metric apiserver_request_error_total to kube-apiserver. This metric tallies the number of request_errors encountered by verb, group, version, resource, subresource, scope, component, and code. ([#84780](https://github.com/kubernetes/kubernetes/pull/84780), [@RainbowMango](https://github.com/RainbowMango))

  If the API server does not support or allow streaming, then `client-go` falls back to fetching the collection using the **list** API verb. ([#127388](https://github.com/kubernetes/kubernetes/pull/127388), [@p0lyn0mial](https://github.com/p0lyn0mial)) [SIG API Machinery and Testing]

### Feature

- Added KMS `v2alpha1` API. ([#110201](https://github.com/kubernetes/kubernetes/pull/110201), [@aramase](https://github.com/aramase))

* Add SIGCHLD handler to pause container ([#36853](https://github.com/kubernetes/kubernetes/pull/36853), [@verb](https://github.com/verb))
* Populate environment variables from a secrets. ([#39446](https://github.com/kubernetes/kubernetes/pull/39446), [@fraenkel](https://github.com/fraenkel))

* Build test targets for all server platforms ([#51873](https://github.com/kubernetes/kubernetes/pull/51873), [@luxas](https://github.com/luxas))

* Build test targets for all server platforms ([#51873](https://github.com/kubernetes/kubernetes/pull/51873), [@luxas](https://github.com/luxas))

  you want to set the equivalent of any of the `--iptables-xxx` options.)
  
  As this code is still very new, it has not been heavily optimized yet;
  while it is expected to _eventually_ have better performance than the
  iptables backend, very little performance testing has been done so far. ([#121046](https://github.com/kubernetes/kubernetes/pull/121046), [@danwinship](https://github.com/danwinship))

* Added all kinds of resource objects' statuses in HPA description. ([#59609](https://github.com/kubernetes/kubernetes/pull/59609), [@zhangxiaoyu-zidif](https://github.com/zhangxiaoyu-zidif))
* Implemented preemption for extender with a verb and new interface ([#58717](https://github.com/kubernetes/kubernetes/pull/58717), [@resouer](https://github.com/resouer))

		buf = xlMetaV2TrimData(buf)

		vers = append(vers, metaCacheEntry{
			name:     "a",
			metadata: buf,
		})
	}

	// Shuffle...
	for i := 0; i < 100; i++ {
		rng := rand.New(rand.NewSource(int64(i)))
		rng.Shuffle(len(vers), func(i, j int) {
			vers[i], vers[j] = vers[j], vers[i]
		})
		var entries []chan metaCacheEntry
		for _, v := range vers {
			v.cached = nil