* 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))

    * 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))