#### Node

- The deprecated kubelet security controls `AllowPrivileged`, `HostNetworkSources`, `HostPIDSources`, and `HostIPCSources` have been removed. Enforcement of these restrictions should be done through admission control (such as `PodSecurityPolicy`) instead. ([#77820](https://github.com/kubernetes/kubernetes/pull/77820), [@dims](https://github.com/dims))

  
  The API does include a few breaking changes:
  - The "extraArgs" component construct is now a list of "name"/"value" pairs instead of a string/string map. This has been done to support duplicate args where needed.
  - The "JoinConfiguration.discovery.timeout" field has been replaced by "JoinConfiguration.timeouts.discovery".

* Authors of aggregated API servers must not rely on authorization being done by the kube-apiserver, and must do delegated authorization in addition. ([#61349](https://github.com/kubernetes/kubernetes/pull/61349), [@sttts](https://github.com/sttts))

* [Breaking change, client-go]: The WaitFor function returns, probably an ErrWaitTimeout, when the done channel is closed, even if the `WaitFunc` doesn't handle the done channel. ([#72364](https://github.com/kubernetes/kubernetes/pull/72364), [@kdada](https://github.com/kdada))

That means that, for example, to apply authentication to all the *path operations* in a router it would end up being done in a different file, instead of keeping related logic together.

          assertThat(bytes.read()).isEqualTo('b'.code)
          assertThat(bytes.read()).isEqualTo('c'.code)

          // This request will share a connection with 'A' cause it's all done.
          client.newCall(Request.Builder().url(server.url("/b")).build()).enqueue(callback)
        }
      },
    )
    callback.await(server.url("/b")).assertCode(200).assertBody("def")
    // New connection.

ains","a","b","bup","compareDocumentPosition","rcssescape","fcssescape","ch","asCodePoint","charCodeAt","escapeSelector","sel","preferredDoc","pushNative","Expr","outermostContext","sortInput","hasDuplicate","documentIsHTML","rbuggyQSA","dirruns","done","classCache","createCache","tokenCache","compilerCache","nonnativeSelectorCache","sortOrder","booleans","identifier","attributes","pseudos","rwhitespace","rcomma","rleadingCombinator","rdescend","rpseudo","ridentifier","matchExpr","ID","CLASS","T...

  | o add specification element to a field, this would be more a technical description of
  |   what is allowed in the field.
  |
  | o validators: there could be several levels of validation. Simple type validation could
  |   be done with a regex, but we need inter-field validation and rules which could be
  |   dealt with by something like drools.
  |
  | o i18n: would be good to be able to have names/descriptions/specifications

- ValidatingAdmissionPolicy type checking now correctly handles `authorizer` variable. ([#118540](https://github.com/kubernetes/kubernetes/pull/118540), [@jiahuif](https://github.com/jiahuif)) [SIG API Machinery]
- When a pod is done or not going to run, then `ResourceClaims` for it can be reused by other pods or deleted. ([#118817](https://github.com/kubernetes/kubernetes/pull/118817), [@pohly](https://github.com/pohly))

  
  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))