[Sig API Machinery]: https://github.com/kubernetes/community/tree/master/sig-api-machinery

### SIG Apps

- For `kubectl`, `--server-side` now migrates ownership of all fields used by client-side-apply to the specified `--fieldmanager`. This prevents fields previously specified using kubectl from being able to live outside of server-side-apply's management and become undeleteable. ([#112905](https://github.com/kubernetes/kubernetes/pull/112905), [@alexzielenski](https://github.com/alexzielenski))...

  - [beta] `kube-apiserver` now publishes a swagger 2.0 spec in addition to a swagger 1.2 spec ([kubernetes/features#53](https://github.com/kubernetes/enhancements/issues/53))
  - [beta] Server-side garbage collection is enabled by default. See [user-guide](http://kubernetes.io/docs/user-guide/garbage-collection/)
- **Apps**

    * handle gracefully problem when kubelet reports duplicated stats for the same container (see [#47853](https://github.com/kubernetes/kubernetes/pull/47853)) on Heapster side
    * fixed bugs and improved performance in Stackdriver Sink

- Fixed an issue that allowed Custom Resources to be created using Server-Side Apply even when their `CustomResourceDefinition` was terminating. ([#132467](https://github.com/kubernetes/kubernetes/pull/132467), [@sdowell](https://github.com/sdowell))

* Update debian-iptables and hyperkube-base images to include CVE fixes. ([#67365](https://github.com/kubernetes/kubernetes/pull/67365), [@ixdy](https://github.com/ixdy))
* Immediately close the other side of the connection when proxying. ([#67288](https://github.com/kubernetes/kubernetes/pull/67288), [@MHBauer](https://github.com/MHBauer))

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- `ComponentSLIs` feature is marked as GA and locked. ([#128317](https://github.com/kubernetes/kubernetes/pull/128317), [@Jefftree](https://github.com/Jefftree)) [SIG Architecture and Instrumentation]
- `kubectl apply --server-side` now supports `--subresource` congruent to `kubectl patch`. ([#127634](https://github.com/kubernetes/kubernetes/pull/127634), [@deads2k](https://github.com/deads2k)) [SIG CLI and Testing]

- The `ClusterTrustBundle` API is moving to `v1beta1`.

## Changelog since v1.15.3

### Other notable changes

* Restores compatibility with kubectl client-side validation when structural schemas are present in a CRD which sets spec.preserveUnknownFields=true ([#82666](https://github.com/kubernetes/kubernetes/pull/82666), [@liggitt](https://github.com/liggitt))