### Other notable changes

* Remove cpu limits for dns pod to avoid CPU starvation ([#33227](https://github.com/kubernetes/kubernetes/pull/33227), [@vishh](https://github.com/vishh))
* Resolves x509 verification issue with masters dialing nodes when started with --kubelet-certificate-authority ([#33141](https://github.com/kubernetes/kubernetes/pull/33141), [@liggitt](https://github.com/liggitt))

 * your HTTP calls. This is because each client holds its own connection pool and thread pools.
 * Reusing connections and threads reduces latency and saves memory. Conversely, creating a client
 * for each request wastes resources on idle pools.
 *
 * Use `new OkHttpClient()` to create a shared instance with the default settings:
 *
 * ```java
 * // The singleton HTTP client.
 * public final OkHttpClient client = new OkHttpClient();

   * having a hash table of size eight. Providing a large enough estimate at construction time
   * avoids the need for expensive resizing operations later, but setting this value unnecessarily
   * high wastes memory.
   *
   * @return this {@code CacheBuilder} instance (for chaining)
   * @throws IllegalArgumentException if {@code initialCapacity} is negative

* The `--authorization-rbac-super-user` flag (alpha in 1.5) is deprecated; the `system:masters` group has privileged access ([#38121](https://github.com/kubernetes/kubernetes/pull/38121), [@deads2k](https://github.com/deads2k))

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- **Cluster Ops**
  - [alpha] Added ability to create/remove clusters w/highly available (replicated) masters on GCE using kube-up/kube-down scripts. ([docs](http://kubernetes.io/docs/admin/ha-master-gce/)) ([kubernetes/features#48](https://github.com/kubernetes/enhancements/issues/48))
- **Federation**

*   Upgraded to go1.9. ([#51375](https://github.com/kubernetes/kubernetes/pull/51375),[ @cblecker](https://github.com/cblecker))
*   Add-on manager now supports HA masters. ([#55466](https://github.com/kubernetes/kubernetes/pull/55466),[ #55782](https://github.com/x13n),[ @x13n](https://github.com/x13n))

* Fix scheduler cache panic when updating pod conditions. ([#56733](https://github.com/kubernetes/kubernetes/pull/56733), [@bsalamat](https://github.com/bsalamat))
* Set route_localnet on nodes & masters in GCE ([#55004](https://github.com/kubernetes/kubernetes/pull/55004), [@ihmccreery](https://github.com/ihmccreery))

- The default delegating authorization options now allow unauthenticated access to healthz, readyz, and livez.  A system:masters user connecting to an authz delegator will not perform an authz check. ([#98325](https://github.com/kubernetes/kubernetes/pull/98325), [@deads2k](https://github.com/deads2k)) [SIG API Machinery, Auth, Cloud Provider and Scheduling]