- **Apps**
  - [stable] When replica sets cannot create pods, they will now report detail via the API about the underlying reason ([kubernetes/features#120](https://github.com/kubernetes/enhancements/issues/120))

or use cri-dockerd if you are relying on Docker Engine as your container runtime.
For more information about ensuring your cluster is ready for this removal, please
see [this guide](https://kubernetes.io/blog/2022/03/31/ready-for-dockershim-removal/).

### Beta APIs Off by Default

- The `gcp` and `azure` auth plugins have been removed from client-go and kubectl. See https://github.com/Azure/kubelogin and https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke for details about the cloud-specific replacements. ([#110013](https://github.com/kubernetes/kubernetes/pull/110013), [@enj](https://github.com/enj)) [SIG API Machinery and Auth]

contact_links:
  - name: Support Request
    url: https://discuss.kubernetes.io

labels: kind/failing-test
body:
  - type: textarea
    id: jobs
    attributes:
      label: Which jobs are failing?
      placeholder: |
        Please only use this template for submitting reports about continuously failing tests or jobs in Kubernetes CI.
    validations:
      required: true

  - type: textarea
    id: tests
    attributes:
      label: Which tests are failing?
    validations:

Kubernetes 1.15 consists of **25 enhancements**: 2 moving to stable, 13 in beta, and 10 in alpha. The main themes of this release are:

#### Continuous Improvement
- Project sustainability is not just about features. Many SIGs have been working on  improving test coverage, ensuring the basics stay reliable, and stability of the core feature set and working on maturing existing features and cleaning up the backlog.

#### Extensibility

* `kubefed init` correctly checks for RBAC API enablement. ([#48077](https://github.com/kubernetes/kubernetes/pull/48077), [@liggitt](https://github.com/liggitt))
* `kubectl api-versions` now always fetches information about enabled API groups and versions instead of using the local cache. ([#48016](https://github.com/kubernetes/kubernetes/pull/48016), [@liggitt](https://github.com/liggitt))

- Remove GA featuregate about ExperimentalHostUserNamespaceDefaultingGate in 1.30 ([#122088](https://github.com/kubernetes/kubernetes/pull/122088), [@bzsuni](https://github.com/bzsuni)) [SIG Node]

## Changelog since v1.4.0-beta.3

### Other notable changes

* Bumped Heapster to v1.2.0. ([#32649](https://github.com/kubernetes/kubernetes/pull/32649), [@piosz](https://github.com/piosz))
    * More details about the release https://github.com/kubernetes/heapster/releases/tag/v1.2.0
* Docker digest validation is too strict ([#32627](https://github.com/kubernetes/kubernetes/pull/32627), [@smarterclayton](https://github.com/smarterclayton))

* kubectl: Fix bug that showed terminated/evicted pods even without `--show-all`. ([#48786](https://github.com/kubernetes/kubernetes/pull/48786), [@janetkuo](https://github.com/janetkuo))
* Add a runtime warning about the kubeadm default token TTL changes. ([#48838](https://github.com/kubernetes/kubernetes/pull/48838), [@mattmoyer](https://github.com/mattmoyer))