* version bump for gci to milestone 53 ([#27210](https://github.com/kubernetes/kubernetes/pull/27210), [@adityakali](https://github.com/adityakali))
* kubectl apply: retry applying a patch if a version conflict error is encountered ([#26557](https://github.com/kubernetes/kubernetes/pull/26557), [@AdoHe](https://github.com/AdoHe))

				objInfo.TargetReplicationStatus(tgt.ARN) == replication.Failed ||
				ri.OpType == replication.ExistingObjectReplicationType {
				// if metadata is not updated for some reason after replication, such as
				// 503 encountered while updating metadata - make sure to set ReplicationStatus
				// as Completed.
				//
				// Note: Replication Stats would have been updated despite metadata update failure.
				rinfo.ReplicationAction = rAction

* fixes spurious "meaningful conflict" error encountered by nodes attempting to update status, which could cause them to be considered unready ([#66171](https://github.com/kubernetes/kubernetes/pull/66171), [@liggitt](https://github.com/liggitt))

        *  Don't break metric storage when duplicate pod metrics encountered causing hpa to fail
* kube-apiserver: Fixed a regression accepting patch requests > 1MB ([#84963](https://github.com/kubernetes/kubernetes/pull/84963), [@liggitt](https://github.com/liggitt))

## Changelog since v1.15.11

## Changes by Kind

### Bug or Regression

- Client-go: resolves an issue with informers falling back to full list requests when timeouts are encountered, rather than re-establishing a watch. ([#89978](https://github.com/kubernetes/kubernetes/pull/89978), [@liggitt](https://github.com/liggitt)) [SIG API Machinery and Testing]

* kube-apiserver: fixed a bug that could cause a goroutine leak if the apiserver encountered an encoding error serving a watch to a websocket watcher ([#84693](https://github.com/kubernetes/kubernetes/pull/84693), [@tedyu](https://github.com/tedyu))

- Resolves non-deterministic behavior of the garbage collection controller when ownerReferences with incorrect data are encountered. Events with a reason of `OwnerRefInvalidNamespace` are recorded when namespace mismatches between child and owner objects are detected. The [kubectl-check-ownerreferences](https://github.com/kubernetes-sigs/kubectl-check-ownerreferences) tool can...

- Fixes an issue where default RBAC policy could fail to reconcile on API server startup if an error was encountered ([#101954](https://github.com/kubernetes/kubernetes/pull/101954), [@voutcn](https://github.com/voutcn)) [SIG Auth]

- Fixed a regression with the `ServiceAccountNodeAudienceRestriction` feature where `azureFile` volumes encountered 'failed to get service account token attributes' errors. ([#129993](https://github.com/kubernetes/kubernetes/pull/129993), [@aramase](https://github.com/aramase)) [SIG Auth and Testing]

import org.lastaflute.web.Execute;
import org.lastaflute.web.response.HtmlResponse;

/**
 * Action class for handling HTTP 500 Internal Server Error pages.
 * This action displays error pages when the server encounters
 * an unexpected condition that prevents it from fulfilling the request.
 */
public class ErrorSystemerrorAction extends FessSearchAction {

    /**
     * Default constructor for ErrorSystemerrorAction.
     */