[20190501162412] Instance Termination Policies, Atomic Updates

Releases
1

This release adds support for fully atomic updates to Kubernetes backends and changes the instance termination priority to “newest first” in an attempt to preserve long-running tasks during autoscale.

  • #3227 atomic updates for k8s [@ddollar]
  • #3230 terminate newest instance during scale down to minimize effect on exi… [@ddollar]