### 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. ([#89976](https://github.com/kubernetes/kubernetes/pull/89976), [@liggitt](https://github.com/liggitt)) [SIG API Machinery and Testing]

- Kubernetes is now built with go 1.23.0 ([#127076](https://github.com/kubernetes/kubernetes/pull/127076), [@cpanato](https://github.com/cpanato)) [SIG Release and Testing]
- Kubernetes was built with Go 1.23.1. ([#127611](https://github.com/kubernetes/kubernetes/pull/127611), [@haitch](https://github.com/haitch)) [SIG Release and Testing]

@GwtCompatible
@Beta
public final class PublicSuffixPatterns {
  private PublicSuffixPatterns() {}

  /** If a hostname is contained as a key in this map, it is a public suffix. */
  public static final ImmutableMap<String, PublicSuffixType> EXACT =
      TrieParser.parseTrie(

#     release_cpu_windows:             Toolchain and CUDA options for Windows CPU builds.
# LINT.IfChange
# Default build options. These are applied first and unconditionally.

# These are used to generate the ML wheel version string.
# See the explanation in the file comment of
# @local_xla//third_party/py/python_wheel.bzl.
# The generated version suffix is used in
# third_party/tensorflow/core/public/release_version.h and

- The client label for apiserver_request_count and apiserver_request_total now no-opts and merely records an empty string. ([#87673](https://github.com/kubernetes/kubernetes/pull/87673), [@logicalhan](https://github.com/logicalhan)) [SIG API Machinery, Instrumentation and Scalability]


<!-- NEW RELEASE NOTES ENTRY -->


# v1.15.9

### SIG Scalability

[SIG Scalability][] is responsible for scalability testing, measuring and
improving system performance, and answering questions related to scalability.

For the 1.8 release, SIG Scalability focused on automating large cluster
scalability testing in a continuous integration (CI) environment. The SIG
defined a concrete process for scalability testing, created

- `apidiscovery.k8s.io/v2beta1` API group is disabled by default ([#130347](https://github.com/kubernetes/kubernetes/pull/130347), [@Jefftree](https://github.com/Jefftree)) [SIG API Machinery and Testing]
- `kubectl apply` now coerces `null` values for labels and annotations in manifests to empty string values, 

  //    which lock is held at any point in the code.
  //
  // 3. I think "enterWhen(notEmpty)" reads better than "notEmpty.enter()".
  //
  // TODO(user): Implement ReentrantLock features:
  //    - toString() method
  //    - getOwner() method
  //    - getQueuedThreads() method
  //    - getWaitingThreads(Guard) method
  //    - implement Serializable

      - [Instrumentation](#instrumentation)
      - [Network](#network)
      - [Node](#node)
      - [Scheduling](#scheduling)
      - [Storage](#storage-1)
    - [Testing](#testing)
      - [Windows](#windows)
    - [Dependencies](#dependencies-7)
      - [Changed](#changed-7)
      - [Unchanged](#unchanged)
      - [Removed](#removed-7)

* Protobuf serialization does not distinguish between `[]` and `null`.