// +optional
  optional LifecycleHandler preStop = 2;
}

// LifecycleHandler defines a specific action that should be taken in a lifecycle
// hook. One and only one of the fields, except TCPSocket must be specified.
message LifecycleHandler {
  // Exec specifies the action to take.
  // +optional
  optional ExecAction exec = 1;

  // HTTPGet specifies the http request to perform.
  // +optional

var p ptr = nil
</pre>

<p>
The functions <code>Alignof</code> and <code>Sizeof</code> take an expression <code>x</code>
of any type and return the alignment or size, respectively, of a hypothetical variable <code>v</code>
as if <code>v</code> was declared via <code>var v = x</code>.
</p>
<p>
The function <code>Offsetof</code> takes a (possibly parenthesized) <a href="#Selectors">selector</a>

- Implemented `event_handling_duration_seconds` metric, which is the time the scheduler takes to handle each kind of events. ([#125929](https://github.com/kubernetes/kubernetes/pull/125929), [@sanposhiho](https://github.com/sanposhiho))
- Implemented `queueing_hint_execution_duration_seconds` metric, which is the time the QueueingHint function takes. ([#126227](https://github.com/kubernetes/kubernetes/pull/126227), [@sanposhiho](https://github.com/sanposhiho))

- Ensures `ExecProbeTimeout=false` kubelet feature gate with dockershim is taken into account, when the exec probe takes longer than `timeoutSeconds` configuration. ([#100200](https://github.com/kubernetes/kubernetes/pull/100200), [@jackfrancis](https://github.com/jackfrancis))

*   Pod preemption has been improved.
    *   Now takes PodDisruptionBudget into account. ([#56178](https://github.com/kubernetes/kubernetes/pull/56178),[ @bsalamat](https://github.com/bsalamat))

job controller back-off logic is now decoupled from workqueue. In case of parallelism > 1, if there are multiple new failures in a reconciliation cycle, all the failures are taken into account to compute the back-off. Previously, the back-off kicked in for all types of failures; with this change, only pod failures are taken into account. If the back-off limits exceeds, the job is marked as failed immediately; before this change, the job is marked as failed in the next back-off. ([#114768](https:...

* Fix a potential bug that scheduler preempts unnecessary pods. ([#70898](https://github.com/kubernetes/kubernetes/pull/70898), [@Huang-Wei](https://github.com/Huang-Wei))
* The kube-apiserver's healthz now takes in an optional query parameter which allows you to disable health checks from causing healthz failures.  ([#70676](https://github.com/kubernetes/kubernetes/pull/70676), [@logicalhan](https://github.com/logicalhan))

- The kube-apiserver's healthz now takes in an optional query parameter which allows you to disable health checks from causing healthz failures.  ([#70676](https://github.com/kubernetes/kubernetes/pull/70676), [@logicalhan](https://github.com/logicalhan))

- Kubeadm now makes sure the etcd manifest is regenerated upon upgrade even when no etcd version change takes place ([#94395](https://github.com/kubernetes/kubernetes/pull/94395), [@rosti](https://github.com/rosti)) [SIG Cluster Lifecycle]

- A new kubelet metric `image_pull_duration_seconds` was added. The metric tracks the duration (in seconds) it takes for an image to be pulled, including the time spent in the waiting queue of image puller. The metric is broken down by bucketed image size. ([#121719](https://github.com/kubernetes/kubernetes/pull/121719), [@ruiwen-zhao](https://github.com/ruiwen-zhao))...