- Kubeadm: When adding an etcd peer to an existing cluster, if an error is returned indicating the peer has already been added, this is accepted and a `ListMembers` call is used instead to return the existing cluster. This helps to diminish the exponential backoff when the first AddMember call times out, while still retaining a similar performance when the peer has already been added from a previous call. ([#104134](https://github.com/kubernet...

		v, ok := cache.iamGroupPolicyMap.Load(name)
		return v, ok
	}
	return cache.iamUserPolicyMap.Load(name)
}

// GroupNotificationHandler - updates in-memory cache on notification of
// change (e.g. peer notification for object storage and etcd watch
// notification).
func (store *IAMStoreSys) GroupNotificationHandler(ctx context.Context, group string) error {
	cache := store.lock()
	defer store.unlock()

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrSiteReplicationPeerResp: {
		Code:           "XMinioSiteReplicationPeerResp",
		Description:    "Error received when contacting a peer site",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrSiteReplicationBackendIssue: {
		Code:           "XMinioSiteReplicationBackendIssue",
		Description:    "Error when requesting object layer backend",

	testServer.Server = httptest.NewUnstartedServer(setCriticalErrorHandler(corsHandler(httpHandler)))

	globalObjLayerMutex.Lock()
	globalObjectAPI = objLayer
	globalObjLayerMutex.Unlock()

	// initialize peer rpc
	host, port := mustSplitHostPort(testServer.Server.Listener.Addr().String())
	globalMinioHost = host
	globalMinioPort = port
	globalMinioAddr = getEndpointsLocalAddr(testServer.Disks)

	initAllSubsystems(ctx)

- Support for proxying a request to a peer kube-apiserver if the local apiserver is not able to serve it due to version skew or in the case the requested api is disabled on the local apiserver ([#117740](https://github.com/kubernetes/kubernetes/pull/117740), [@Richabanker](https://github.com/Richabanker))...

*   `conversion-gen` is now usable in a context without a vendored k8s.io/kubernetes. The Kubernetes core API is removed from `default extra-peer-dirs`. ([#54394](https://github.com/kubernetes/kubernetes/pull/54394),[ @sttts](https://github.com/sttts))

a problem where spurious retransmits in a long-running TCP connection to a service
IP could result in the connection being closed with the error "Connection reset by
peer" ([#74840](https://github.com/kubernetes/kubernetes/pull/74840), [@anfernee](https://github.com/anfernee))

- If `kubeadm reset` finds no etcd member ID for the peer it removes during the `remove-etcd-member` phase, it continues immediately to other phases, instead of retrying the phase for up to 3 minutes before continuing. ([#117948](https://github.com/kubernetes/kubernetes/pull/117948), [@dlipovetsky](https...

s/kubernetes/pull/57902), [@kawych](https://github.com/kawych))

* On cluster provision or upgrade, kubeadm now generates certs and secures all connections to the etcd static-pod with mTLS. This includes the etcd serving cert, the etcd peer cert, and the apiserver etcd client cert. Flags and hostMounts are added to the etcd and apiserver static-pods to load these certs. For connections to etcd, https is now used in favor of http. ([#57415](https://github.com/kubernetes/kubernetes/pull/57415),...

- If `kubeadm reset` finds no etcd member ID for the peer it removes during the `remove-etcd-member` phase, it continues immediately to other phases, instead of retrying the phase for up to 3 minutes before continuing. ([#118057](https://github.com/kubernetes/kubernetes/pull/118057), [@dlipovetsky](https...