* Add CLUSTER_SIGNING_DURATION environment variable to cluster ([#52497](https://github.com/kubernetes/kubernetes/pull/52497), [@jcbsmpsn](https://github.com/jcbsmpsn))
    * configuration scripts to allow configuration of signing duration of
    * certificates issued via the Certificate Signing Request API.

- The new feature gate "SidecarContainers" is now available. This feature introduces sidecar containers, a new type of init container that starts before other containers but remains running for the full duration of the pod's lifecycle and will not block pod termination. ([#116429](https://github.com/kubernetes/kubernetes/pull/116429), [@gjkim42](https://github.com/gjkim42)) [SIG API Machinery, Apps, Node, Scheduling and Testing]

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* PodSecurityPolicy admission information has been added to audit logs. ([#58143](https://github.com/kubernetes/kubernetes/pull/58143), [@CaoShuFeng](https://github.com/CaoShuFeng))
* TokenRequests now are required to have an expiration duration between 10 minutes and 2^32 seconds. ([#63999](https://github.com/kubernetes/kubernetes/pull/63999), [@mikedanese](https://github.com/mikedanese))

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- The `WaitFor` and `WaitForWithContext` functions in the wait package have now been marked private. Callers should use the equivalent `Poll*` method with a zero duration interval. ([#115116](https://github.com/kubernetes/kubernetes/pull/115116), [@smarterclayton](https://github.com/smarterclayton))

- Watch requests that are delegated to aggregated API servers no longer reserve concurrency units (seats) in the API Priority and Fairness dispatcher for their entire duration. ([#105511](https://github.com/kubernetes/kubernetes/pull/105511), [@benluddy](https://github.com/benluddy))

- Kubelet: add `kubelet_volume_metric_collection_duration_seconds` metrics for volume disk usage calculation duration ([#107201](https://github.com/kubernetes/kubernetes/pull/107201), [@pacoxu](https://github.com/pacoxu))

pkg net, type Dialer struct, ControlContext func(context.Context, string, string, syscall.RawConn) error #55301
pkg os/exec, type Cmd struct, Cancel func() error #50436
pkg os/exec, type Cmd struct, WaitDelay time.Duration #50436
pkg os/exec, var ErrWaitDelay error #50436
pkg path/filepath, func IsLocal(string) bool #56219
pkg path/filepath, var SkipAll error #47209
pkg reflect, method (Value) Comparable() bool #46746

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