- Client-ca bundles for the all generic-apiserver based servers will dynamically reload from disk on content changes ([#83579](https://github.com/kubernetes/kubernetes/pull/83579), [@deads2k](https://github.com/deads2k))

* Allows extension API server to dynamically discover the requestheader CA certificate when the core API server doesn't use certificate based authentication for it's clients ([#66394](https://github.com/kubernetes/kubernetes/pull/66394), [@rtripat](https://github.com/rtripat))

* Bug fix: Clusters with GCE feature 'DiskAlphaAPI' enabled were unable to dynamically provision GCE PD volumes. ([#59447](https://github.com/kubernetes/kubernetes/pull/59447), [@verult](https://github.com/verult))



# v1.8.9

- Updated the feature MultiCIDRServiceAllocator to beta (disabled by default). Users need to enable the feature gate and the networking v1beta1 group to be able to use this new feature, that allows to dynamically reconfigure Service CIDR ranges. ([#125021](https://github.com/kubernetes/kubernetes/pull/125021), [@aojea](https://github.com/aojea)) [SIG API Machinery, Apps, CLI, Etcd, Instrumentation, Network and Testing]

- Fixed a bug that prevented deletion of dynamically provisioned volumes in Quobyte backends. ([#68925](https://github.com/kubernetes/kubernetes/pull/68925), [@casusbelli](https://github.com/casusbelli))

### Testing

- The extension API server can now dynamically discover the requestheader CA certificate when the core API server doesn't use certificate based authentication for it's clients. ([#66394](https://github.com/kubernetes/kubernetes/pull/66394), [@rtripat](https://github.com/rtripat))

- Expose `/debug/flags/v` to allow dynamically setting log level for kube-proxy. ([#98306](https://github.com/kubernetes/kubernetes/pull/98306), [@borgerli](https://github.com/borgerli)) [SIG Network]

During server startup, prior to the server reporting healthy (via `/healthz`), not all API groups may be reported.
Wait for the server to report healthy (via `/healthz`) before depending on the information provided by the discovery APIs.
Additionally, since the information returned from the discovery APIs may change dynamically, a cache of the results should not be considered authoritative.

* A smaller fix for the apiserver panic. ([#67552](https://github.com/kubernetes/kubernetes/pull/67552), [@wgliang](https://github.com/wgliang))
* Allows extension API server to dynamically discover the requestheader CA certificate when the core API server doesn't use certificate based authentication for it's clients ([#66394](https://github.com/kubernetes/kubernetes/pull/66394), [@rtripat](https://github.com/rtripat))

- Kubernetes cannot distinguish between GCE Zonal PDs and Regional PDs with the same name. To workaround this issue, precreate PDs with unique names. PDs that are dynamically provisioned do not encounter this issue. ([#70716](https://github.com/kubernetes/kubernetes/pull/70716), [@msau42](https://github.com/msau42))

## Known Issues