Commits on Aug 26, 2018

1. Kubelet creates and manages node leases …

   This extends the Kubelet to create and periodically update leases in a
   new kube-node-lease namespace. Based on [KEP-0009](https://github.com/kubernetes/community/blob/master/keps/sig-node/0009-node-heartbeat.md),
   these leases can be used as a node health signal, and will allow us to
   reduce the load caused by over-frequent node status reporting.
   
   - add NodeLease feature gate
   - add kube-node-lease system namespace for node leases
   - add Kubelet option for lease duration
   - add Kubelet-internal lease controller to create and update lease
   - add e2e test for NodeLease feature
   - modify node authorizer and node restriction admission controller
   to allow Kubelets access to corresponding leases

   

   mtaufen committed Aug 26, 2018
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