- Kubeadm now warns (instead of error out) on missing "ca.key" files for root CA, front-proxy CA and etcd CA, during "kubeadm join --control-plane" if the user has provided all certificates, keys and kubeconfig files which require signing with the given CA keys. ([#94988](https://github.com/kubernetes/kubernetes/pull/94988), [@neolit123](https://github.com/neolit123))

- Fallback from OpenAPI V3 to V2 when the OpenAPI V3 document is invalid or incomplete. ([#117980](https://github.com/kubernetes/kubernetes/pull/117980), [@seans3](https://github.com/seans3)) [SIG CLI]
- Fix bug where `listOfStrings.join()` in CEL expressions resulted in an unexpected internal error. ([#117596](https://github.com/kubernetes/kubernetes/pull/117596), [@jpbetz](https://github.com/jpbetz)) [SIG API Machinery]

assignment of regular parameters.
</p>

<pre>
func Split(s string, pos int) (string, string) {
	return s[0:pos], s[pos:]
}

func Join(s, t string) string {
	return s + t
}

if Join(Split(value, len(value)/2)) != value {
	log.Panic("test fails")
}
</pre>

<p>
A method call <code>x.m()</code> is valid if the <a href="#Method_sets">method set</a>

- Fixed bug where `listOfStrings.join()` in CEL expressions resulted in an unexpected internal error. ([#117593](https://github.com/kubernetes/kubernetes/pull/117593), [@jpbetz](https://github.com/jpbetz)) [SIG API Machinery]

	// Allocate starting block
	s.f.Entry = s.f.NewBlock(ssa.BlockPlain)
	s.f.Entry.Pos = fn.Pos()
	s.f.IsPgoHot = isPgoHot

	if printssa {
		ssaDF := ssaDumpFile
		if ssaDir != "" {
			ssaDF = filepath.Join(ssaDir, base.Ctxt.Pkgpath+"."+s.f.NameABI()+".html")
			ssaD := filepath.Dir(ssaDF)
			os.MkdirAll(ssaD, 0755)
		}
		s.f.HTMLWriter = ssa.NewHTMLWriter(ssaDF, s.f, ssaDumpCFG)

* The Certificates API has graduated from alpha to beta. This is a backwards-incompatible change since the alpha support is dropped, and therefore kubeadm v1.5 and v1.6 don't work together (for example kubeadm v1.5 can't join a kubeadm v1.6 cluster).
* Supporting only etcd3, with 3.0.14 as the minimum version.