- [**Security**](#security)
      - [Admission Control](#admission-control)
      - [TLS Bootstrapping](#tls-bootstrapping)
      - [Audit Logging](#audit-logging)
      - [Encryption at Rest](#encryption-at-rest)
      - [Node Authorization](#node-authorization)
    - [**Application Autoscaling**](#application-autoscaling)
      - [Horizontal Pod Autoscaler](#horizontal-pod-autoscaler)

- Added a new alpha API: ClusterTrustBundle (`certificates.k8s.io/v1alpha1`).
  A ClusterTrustBundle may be used to distribute [X.509](https://www.itu.int/rec/T-REC-X.509) trust anchors to workloads within the cluster. ([#113218](https://github.com/kubernetes/kubernetes/pull/113218), [@ahmedtd](https://github.com/ahmedtd)) [SIG API Machinery, Auth and Testing]

      <match value="var Prototype={" type="string" offset="0"/>
      <match value="function $w(t){" type="string" offset="0"/>
      <!-- React -->
      <match value="/** @license React" type="string" offset="0"/>
      <match value="/**" type="string" offset="0">
         <match value="* React " offset="4:8"/>
      </match>
    </magic>
  </mime-type>

  <mime-type type="application/json">

- 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))...

- the IP allocator in v1.17.0 can return errors such as `the cluster IP <ip> for service <service-name> is not within the service CIDR <cidr>; please recreate`...

   - In version 1.8, enable this behavior by setting the
     `--horizontal-pod-autoscaler-use-rest-clients` flag to `true`.

   - In version 1.9, this behavior will be enabled by default, and must be explicitly
     disabled by setting the `--horizontal-pod-autoscaler-use-rest-clients` flag to `false`.

### Cluster Lifecycle

### Taints and Tolerations
* Add a manager to NodeController that is responsible for removing Pods from Nodes tainted with NoExecute Taints. This feature is beta (as the rest of taints) and enabled by default. It's gated by controller-manager enable-taint-manager flag. ([#40355](https://github.com/kubernetes/kubernetes/pull/40355), [@gmarek](https://github.com/gmarek))

* calico-node addon tolerates all NoExecute and NoSchedule taints by default. ([#57122](https://github.com/kubernetes/kubernetes/pull/57122), [@caseydavenport](https://github.com/caseydavenport))
* Allow kubernetes components to react to SIGTERM signal and shutdown gracefully. ([#57756](https://github.com/kubernetes/kubernetes/pull/57756), [@mborsz](https://github.com/mborsz))

* apiserver: fixes handling and logging of panics in REST handlers to prevent crashes ([#71076](https://github.com/kubernetes/kubernetes/pull/71076), [@liggitt](https://github.com/liggitt))

* Fixes spurious 0-length API responses. ([#72856](https://github.com/kubernetes/kubernetes/pull/72856), [@liggitt](https://github.com/liggitt))