- Kubeadm: add support for certificate chain validation. When using kubeadm in external CA mode, this allows an intermediate CA to be used to sign the certificates. The intermediate CA certificate must be appended to each signed certificate for this to work correctly. ([#97266](https://github.com/kubernetes/kubernetes/pull/97266), [@robbiemcmichael](https://github.com/robbiemcmichael)) [SIG Cluster...

* The minimum Kubernetes version in kubeadm is now v1.9.0. ([#57233](https://github.com/kubernetes/kubernetes/pull/57233), [@xiangpengzhao](https://github.com/xiangpengzhao))

* Fixes a bug in Heapster deployment for google sink. ([#57902](https://github.com/kubernetes/kubernetes/pull/57902), [@kawych](https://github.com/kawych))

- K8s.io/client-go/tools/record.EventBroadcaster: after Shutdown() is called, the broadcaster now gives up immediately after a failure to write an event to a sink. Previously it tried multiple times for 12 seconds in a goroutine. ([#115514](https://github.com/kubernetes/kubernetes/pull/115514), [@pohly](https://github.com/pohly)) [SIG API Machinery]

* Fixes a possible deadlock preventing quota from being recalculated ([#58107](https://github.com/kubernetes/kubernetes/pull/58107), [@ironcladlou](https://github.com/ironcladlou))
* Fixes a bug in Heapster deployment for google sink. ([#57902](https://github.com/kubernetes/kubernetes/pull/57902), [@kawych](https://github.com/kawych))

The [Kubernetes community repo](https://github.com/kubernetes/community) contains information about how to get started, how the community organizes, and more.

## Sign the CLA

* Removed always pull policy from the template for ingress on CDK. ([#61598](https://github.com/kubernetes/kubernetes/pull/61598), [@hyperbolic2346](https://github.com/hyperbolic2346))
* escape literal percent sign when formatting ([#61523](https://github.com/kubernetes/kubernetes/pull/61523), [@dixudx](https://github.com/dixudx))

  - `--service-account-key-file`, set to one or more files containing one or more public keys used to verify tokens.

egator_x509_missing_san_total` and `apiserver_webhooks_x509_missing_san_total`. This metric measures a number of connections to webhooks/aggregated API servers that use certificates without Subject Alternative Names. It being non-zero is a warning sign that these connections will stop functioning in the future since Golang is going to deprecate x509 certificate subject Common Names for server hostname verification. ([#95396](https://github.com/kubernetes/kubernetes/pull/95396), [@stlaz](https://github.com/stlaz))...

    * 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
* fluentd-gcp addon: Fix a bug in the event-exporter, when repeated events were not sent to Stackdriver. ([#50511](https://github.com/kubernetes/kubernetes/pull/50511), [@crassirostris](https://github.com/crassirostris))