- Add flag --lease-reuse-duration-seconds for kube-apiserver to config etcd lease reuse duration. ([#97009](https://github.com/kubernetes/kubernetes/pull/97009), [@lingsamuel](https://github.com/lingsamuel)) [SIG API Machinery and Scalability]

	// Minimum consecutive failures for the probe to be considered failed after having succeeded.
	// +optional
	FailureThreshold int32
	// Optional duration in seconds the pod needs to terminate gracefully upon probe failure.
	// The grace period is the duration in seconds after the processes running in the pod are sent
	// a termination signal and the time when the processes are forcibly halted with a kill signal.

	"terminationGracePeriodSeconds": "Optional duration in seconds the pod needs to terminate gracefully. May be decreased in delete request. Value must be non-negative integer. The value zero indicates stop immediately via the kill signal (no opportunity to shut down). If this value is nil, the default grace period will be used instead. The grace period is the duration in seconds after the processes running in the pod are sent a termination signal and the...

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  optional string restartPolicy = 3;

  // Optional duration in seconds the pod needs to terminate gracefully. May be decreased in delete request.
  // Value must be non-negative integer. The value zero indicates stop immediately via
  // the kill signal (no opportunity to shut down).
  // If this value is nil, the default grace period will be used instead.
  // The grace period is the duration in seconds after the processes running in the pod are sent

  optional string restartPolicy = 3;

  // Optional duration in seconds the pod needs to terminate gracefully. May be decreased in delete request.
  // Value must be non-negative integer. The value zero indicates stop immediately via
  // the kill signal (no opportunity to shut down).
  // If this value is nil, the default grace period will be used instead.
  // The grace period is the duration in seconds after the processes running in the pod are sent

	// Defaults to 3. Minimum value is 1.
	// +optional
	FailureThreshold int32 `json:"failureThreshold,omitempty" protobuf:"varint,6,opt,name=failureThreshold"`
	// Optional duration in seconds the pod needs to terminate gracefully upon probe failure.
	// The grace period is the duration in seconds after the processes running in the pod are sent
	// a termination signal and the time when the processes are forcibly halted with a kill signal.

	// Maximum duration that a sidecar can be connected to a pilot.
	//
	// This setting balances out load across pilot instances, but adds some resource overhead.
	//
	// Examples: 300s, 30m, 1h

#### Application autoscaling
* Make "upscale forbidden window" and "downscale forbidden window"  duration configurable in arguments of kube-controller-manager. ([#42101](https://github.com/kubernetes/kubernetes/pull/42101), [@Dmitry1987](https://github.com/Dmitry1987))

#### Application Deployment

- The kube-controller-manager's deprecated `--experimental-cluster-signing-duration` flag is now removed. Adapt your machinery to use the `--cluster-signing-duration` flag that is available since v1.19. ([#108476](https://github.com/kubernetes/kubernetes/pull/108476), [@ialidzhikov](https://github.com/ialidzhikov))