### Bug or Regression

- Added jitter factor to lease controller that better smears load on kube-apiserver over time. ([#101652](https://github.com/kubernetes/kubernetes/pull/101652), [@marseel](https://github.com/marseel)) [SIG API Machinery and Scalability]

- A new `kubelet_preemptions` metric is reported from Kubelets to track the number of preemptions occurring over time, and which resource is triggering those preemptions. ([#84120](https://github.com/kubernetes/kubernetes/pull/84120), [@smarterclayton](https://github.com/smarterclayton))

- Fixed a bug that a pod's .status.nominatedNodeName is not cleared properly, and thus over-occupied system resources. ([#107109](https://github.com/kubernetes/kubernetes/pull/107109), [@Huang-Wei](https://github.com/Huang-Wei)) [SIG Scheduling and Testing]

variables. oidc: enabled: false configUrl: "https://identity-provider-url/.well-known/openid-configuration" clientId: "minio" clientSecret: "" # Provide existing client secret from the Kubernetes Secret resource, existing secret will have priority over `clientSecret` existingClientSecret: "" existingClientSecret: "" claimName: "policy" scopes: "openid,profile,email" redirectUri: "https://console-endpoint-url/oauth_callback" # Can leave empty claimPrefix: "" comment: "" networkPolicy: enabled: false...

variables. oidc: enabled: false configUrl: "https://identity-provider-url/.well-known/openid-configuration" clientId: "minio" clientSecret: "" # Provide existing client secret from the Kubernetes Secret resource, existing secret will have priority over `clientSecret` existingClientSecret: "" existingClientSecret: "" claimName: "policy" scopes: "openid,profile,email" redirectUri: "https://console-endpoint-url/oauth_callback" # Can leave empty claimPrefix: "" comment: "" networkPolicy: enabled: false...

### **Cluster Federation**
#### Placement Policy
* [alpha] The federation-apiserver now supports a SchedulingPolicy admission controller that enables policy-based control over placement of federated resources. For more information, see [Set up placement policies in Federation](https://kubernetes.io/docs/tasks/federation/set-up-placement-policies-federation/).

#### Cluster Selection

variables. oidc: enabled: false configUrl: "https://identity-provider-url/.well-known/openid-configuration" clientId: "minio" clientSecret: "" # Provide existing client secret from the Kubernetes Secret resource, existing secret will have priority over `clientId` and/or `clientSecret`` existingClientSecret: "" existingClientIdKey: "" existingClientSecret: "" claimName: "policy" scopes: "openid,profile,email" redirectUri: "https://console-endpoint-url/oauth_callback" # Can leave empty claimPrefix:...

forwarded to kubelet static pods to control pull policy for etcd and control plane images. This option allows for precise image pull policy specification for master nodes and thus for more tight control over images. It is useful in CI environments and in environments, where the user has total control over master VM templates (thus, the master VM templates can be preloaded with the required Docker images for the control plane services). ([#58960](https://github.com/kubernetes/kubernetes/pull/58960), [...

variables. oidc: enabled: false configUrl: "https://identity-provider-url/.well-known/openid-configuration" clientId: "minio" clientSecret: "" # Provide existing client secret from the Kubernetes Secret resource, existing secret will have priority over `clientId` and/or `clientSecret`` existingClientSecret: "" existingClientIdKey: "" existingClientSecret: "" claimName: "policy" scopes: "openid,profile,email" redirectUri: "https://console-endpoint-url/oauth_callback" # Can leave empty claimPrefix:...

	w.buf = append(w.buf, b...)
	w.readFromBytes += len(b)
	return int64(len(b)), err
}

// Test that calling (*Writer).ReadFrom with a partially-filled buffer
// fills the buffer before switching over to ReadFrom.
func TestWriterReadFromWithBufferedData(t *testing.T) {
	const bufsize = 16

	input := createTestInput(64)
	rfw := &readFromWriter{}
	w := NewWriterSize(rfw, bufsize)