- Use checksums instead of fsyncs to ensure discovery cache integrity ([#110851](https://github.com/kubernetes/kubernetes/pull/110851), [@negz](https://github.com/negz)) [SIG API Machinery]

  * Remove the `--enable-cri` flag. CRI is now the default, and the only way to integrate with Kubelet for the container runtimes.([#45194](https://github.com/kubernetes/kubernetes/pull/45194), [@yujuhong](https://github.com/yujuhong))

Alpha for the cloudprovider-aws cloud controller manager binary. Additionally we added [aws-k8s-tester](https://github.com/kubernetes/test-infra/issues/9814), deployer interface for kubetest, to the test-infra repository. This plugin allowed us to integrate Prow to the 3 subprojects defined above in order to provide CI signal for all 3 features. The CI signal is visible [here](https://testgrid.k8s.io/) under SIG-AWS.

For detailed release notes on the three alpha features from SIG AWS, please...

    *   Make crictl command more user friendly and add more subcommands.
    *   Integrate with CRI verbose option to provide extra debug information.
    *   Update CRI to kubernetes v1.9.
    *   Bug fixes in validation test suites.