### Certificates
* The CertificateSigningRequest API added the `extra` field to persist all information about the requesting user. This mirrors the fields in the SubjectAccessReview API used to check authorization. ([#41755](https://github.com/kubernetes/kubernetes/pull/41755), [@liggitt](https://github.com/liggitt))

    * SSL support for ELB listeners
  * Allow VPC CIDR to be specified (experimental)
  * Fix problems with >2 security groups
* GCP:
  * Enable using gcr.io as a Docker registry mirror.
  * Make bigger master root disks in GCE for large clusters.
  * Change default clusterCIDRs from /16 to /14 allowing 1000 Node clusters by default.
  * Allow Debian Jessie on GCE.

* Fix lint failures on kubernetes-e2e charm ([#45832](https://github.com/kubernetes/kubernetes/pull/45832), [@Cynerva](https://github.com/Cynerva))

- Setting a mirror pod's phase to Succeeded or Failed can prevent the corresponding static pod from restarting due mutation of a Kubelet cache. ([#116482](https://github.com/kubernetes/kubernetes/pull/116482), [@smarterclayton](https://github.com/smarterclayton)) [SIG...