- client-go: The `rest.AnonymousClientConfig(*rest.Config) *rest.Config` helper method no longer copies custom `Transport` and `WrapTransport` fields, because those can be used to inject user credentials. ([#75771](https://github.com/kubernetes/kubernetes/pull/75771), [@liggitt](https://github.com/liggitt))...

    - [Node Binaries](#node-binaries-7)
  - [Changelog since v1.21.6](#changelog-since-v1216)
  - [Changes by Kind](#changes-by-kind-6)
    - [Feature](#feature-4)
    - [Failing Test](#failing-test)
    - [Bug or Regression](#bug-or-regression-6)
  - [Dependencies](#dependencies-7)
    - [Added](#added-7)
    - [Changed](#changed-7)
    - [Removed](#removed-7)
- [v1.21.6](#v1216)

  - [Changelog since v1.26.4](#changelog-since-v1264)
  - [Changes by Kind](#changes-by-kind-10)
    - [API Change](#api-change-4)
    - [Feature](#feature-10)
    - [Failing Test](#failing-test)
    - [Bug or Regression](#bug-or-regression-10)
    - [Other (Cleanup or Flake)](#other-cleanup-or-flake-3)
  - [Dependencies](#dependencies-10)
    - [Added](#added-10)
    - [Changed](#changed-10)

- The deprecated mondo `kubernetes-test` tarball is no longer built. Users running Kubernetes e2e tests should use the `kubernetes-test-portable` and `kubernetes-test-{OS}-{ARCH}` tarballs instead. ([#83093](https://github.com/kubernetes/kubernetes/pull/83093), [@ixdy](https://github.com/ixdy))

### Scheduling

- Client-go metrics: change bucket distribution for `rest_client_request_duration_seconds` and `rest_client_rate_limiter_duration_seconds` from [0.001, 0.002, 0.004, 0.008, 0.016, 0.032, 0.064, 0.128, 0.256, 0.512] to [0.005, 0.025, 0.1, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, 15.0, 30.0, 60.0}] ([#106911](https://github.com/kubernete...

    - [Container Images](#container-images-6)
  - [Changelog since v1.27.6](#changelog-since-v1276)
  - [Changes by Kind](#changes-by-kind-6)
    - [Feature](#feature-6)
    - [Failing Test](#failing-test)
    - [Bug or Regression](#bug-or-regression-6)
    - [Other (Cleanup or Flake)](#other-cleanup-or-flake-3)
  - [Dependencies](#dependencies-6)
    - [Added](#added-6)
    - [Changed](#changed-6)

    - [Container Images](#container-images-6)
  - [Changelog since v1.28.2](#changelog-since-v1282)
  - [Changes by Kind](#changes-by-kind-6)
    - [Feature](#feature-6)
    - [Failing Test](#failing-test)
    - [Bug or Regression](#bug-or-regression-6)
    - [Other (Cleanup or Flake)](#other-cleanup-or-flake-3)
  - [Dependencies](#dependencies-6)
    - [Added](#added-6)
    - [Changed](#changed-6)

// with a given Reason reflecting a consistent underlying trigger, or the
// continued existence of events with that Reason.  Events should be
// treated as informative, best-effort, supplemental data.
message Event {
  // Standard object's metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata

    *   Update CRI to kubernetes v1.9.
    *   Bug fixes in validation test suites.
*   [beta] [cri-containerd](https://github.com/kubernetes-incubator/cri-containerd): CRI implementation for containerd is now v1.0.0-beta.0, [[@Random-Liu](https://github.com/Random-Liu)]
    *   This release supports Kubernetes 1.9+ and containerd v1.0.0+.
    *   Pass all Kubernetes 1.9 e2e test, node e2e test and CRI validation tests.

- When using the conformance test image, a new environment variable `E2E_USE_GO_RUNNER` will cause the tests to be run with the new golang-based test runner rather than the current bash wrapper. ([#79284](https://github.com/kubernetes/kubernetes/pull/79284), [@johnSchnake](https://github.com/johnSchnake))