*  Docker 1.10.3 contains [backports provided by RedHat](https://github.com/docker/docker/compare/v1.10.3...runcom:docker-1.10.3-stable) for known issues
  * Docker versions as old as may 1.9.1 work with [known issues](CHANGELOG.md#191) but this is not guaranteed
* rkt version 1.21.0
  * known issues with the rkt runtime are [listed here](http://kubernetes.io/docs/getting-started-guides/rkt/notes/)

  Also, corrected how the scheduling framework handle Unschedulable status from PreFilter. 
  Before this PR, if PreFilter return `Unschedulable`, it may result in an unexpected abortion in the preemption, 
  which shouldn't happen in the default scheduler, but may happen in schedulers with a custom plugin. ([#119779](https://github.com/kubernetes/kubernetes/pull/119779), [@sanposhiho](https://github.com/sanposhiho)) [SIG Scheduling]

        * Make the kubectl from k8s release the default on GCI
* kubelet summary rootfs now refers to the filesystem that contains the Kubelet RootDirectory (var/lib/kubelet) instead of cadvisor's rootfs ( / ), since they may be different filesystems. ([#35136](https://github.com/kubernetes/kubernetes/pull/35136), [@dashpole](https://github.com/dashpole))