- Change `pod_preemption_victims` metric from Gauge to Histogram. ([#83603](https://github.com/kubernetes/kubernetes/pull/83603), [@Tabrizian](https://github.com/Tabrizian))
- Following metrics from kubelet are now marked as with the ALPHA stability level:

variable.\n//\n// We highly encourage you to not customize the default value, but instead use\n// this to tweak colors on an as-needed basis. This aesthetic change is based on\n// WebKit's default styles, but applicable to a wider range of browsers. Its\n// usability and accessibility should be taken into account with any change.\n//\n// Example usage: change the default blue border and shadow to white for better\n// contrast against a dark gray background.\n@mixin form-control-focus($ignore-warning: false) {\n...

tolerate the NoSchedule taint if the taint is added to a Node.  There is an open PR ([#48189](https://github.com/kubernetes/kubernetes/pull/48189)) to resolve this issue, but as this issue also exists in 1.6, and as we do not wish to risk release stability by merging it directly prior to a release without sufficient testing, we have decided to defer merging the PR until the next point release for each minor version ([#48190](https://github.com/kubernetes/kubernetes/pull/48190)).

* Protobuf...

// the DaemonSet and StatefulSet controllers for update and rollback, this object is beta. However,
// it may be subject to name and representation changes in future releases, and clients should not
// depend on its stability. It is primarily for internal use by controllers.
message ControllerRevision {
  // Standard object's metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata

// the DaemonSet and StatefulSet controllers for update and rollback, this object is beta. However,
// it may be subject to name and representation changes in future releases, and clients should not
// depend on its stability. It is primarily for internal use by controllers.
message ControllerRevision {
  // Standard object's metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata

  // +patchMergeKey=type
  // +patchStrategy=merge
  // +listType=map
  // +listMapKey=type
  repeated k8s.io.apimachinery.pkg.apis.meta.v1.Condition conditions = 7;
}

// PodSecurityPolicy governs the ability to make requests that affect the Security Context
// that will be applied to a pod and container.
// Deprecated in 1.21.
message PodSecurityPolicy {
  // Standard object's metadata.

    assertEquals(localCacheOne.removalListener, localCacheTwo.removalListener);
    assertEquals(localCacheOne.ticker, localCacheTwo.ticker);

    // serialize the reconstituted version to be sure we haven't lost the ability to reserialize
    LocalLoadingCache<Object, Object> three = SerializableTester.reserialize(two);
    LocalCache<Object, Object> localCacheThree = three.localCache;

    assertEquals(localCacheOne.removalListener, localCacheTwo.removalListener);
    assertEquals(localCacheOne.ticker, localCacheTwo.ticker);

    // serialize the reconstituted version to be sure we haven't lost the ability to reserialize
    LocalLoadingCache<Object, Object> three = SerializableTester.reserialize(two);
    LocalCache<Object, Object> localCacheThree = three.localCache;

- Kube-apiserver: Fixed a `1.27`+ regression in watch stability by serving watch requests without a `resourceVersion` from the watch cache by default, as in <`1.27` (disabling the change in PR 115096 by default). This mitigates the impact of an etcd watch bug (https://github.com/etcd-io/etcd/pull/17555). If the 1.27 change in PR 115096 to serve these requests from underlying storage is still desired despite the impact on watch stability, it can be re-enabled with a `WatchFromStorageWithoutResourceVersion`...

For the 1.8 release, SIG API Machinery focused on stability and on ecosystem enablement. Features include the ability to break large LIST calls into smaller chunks, improved support for API server customization with either custom API servers or Custom Resource Definitions, and client side event spam filtering.