Deployment Pod Replacement Policy

[atiratree]

Enhancement Description

• One-line enhancement description (can be used as a release note): a new deployment policy, that can be used to determine whether to replace terminating or terminated pods in deployments with new pods.
• Kubernetes Enhancement Proposal: KEP-3973, KEP-5882: split DeploymentReplicaSetTerminatingReplicas and DeploymentPodReplacementPolicy features into two standalone KEPs for easier tracking. #5883
• Discussion Link: this KEP is split from Consider Terminating Pods in Deployments #3973 to make it easier to track
• PRs by stage and milestone:
  • Alpha - v1.36
    • KEP (k/enhancements) update PR(s):
      • KEP-3973: Consider Terminating Pods in Deployments #4357
      • KEP-3973: Update PodReplacementPolicy for Deployments #4670
      • KEP-3973: fix scaling calculations in PodReplacementPolicy KEP #4763
      • KEP-3973: fix replicaset preference in leftover calculation in PodReplacementPolicy KEP #4774
      • KEP-3973: Update PodReplacementPolicy alpha to 1.32 #4903
      • KEP-3973: Consider deployment completion in DeploymentPodReplacementPolicy #4976
      • KEP-3973: update Consider Terminating Pods in Deployments #5398
      • KEP-3973: update milestone in Consider Terminating Pods in Deployments #5568
      • KEP-3973, KEP-5882: split DeploymentReplicaSetTerminatingReplicas and DeploymentPodReplacementPolicy features into two standalone KEPs for easier tracking. #5883
    • Code (k/k) update PR(s):
      • 1.32 Pre
        • add tests for getReplicaSetFraction in the deployment controller kubernetes#128535
        • simplify ScalingReplicaSet event building in the deployment controller kubernetes#128526
        • improve validation for ReplicaSet annotations in the deployment controller kubernetes#128527
        • simplify ScalingReplicaSet event building in the deployment controller kubernetes#128526
      • 1.34 Pre
        • add Replicaset -> ReplicationController conversion test kubernetes#132890
      • 1.35 Pre
        • add integration tests for pod replacement during scaling and Recreate/RollingUpdate strategies kubernetes#134959
      • 1.36 Alpha
        • add PodReplacementPolicy for Deployments kubernetes#123430
        • rename scaleReplicaSetAndRecordEvent to scaleReplicaSetWithLazyAnnotationUpdate kubernetes#135234
    • Docs (k/website) update PR(s):
      • [WIP] [KEP-5882]: docs for DeploymentPodReplacementPolicy website#54431
      • [WIP] [KEP-5882]: feature blog for DeploymentPodReplacementPolicy placeholder PR website#54621

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

[atiratree]

/sig apps
/assign @atiratree

[atiratree]

cc @kannon92 @soltysh

[soltysh]

/stage alpha
/milestone v1.36
/label lead-opted-in