Scale down a deployment by removing specific pods (PodDeletionCost)

[ahg-g]

Enhancement Description

• One-line enhancement description (can be used as a release note): allow users to decide which pods should be scaled first
• Kubernetes Enhancement Proposal: WIP
• Discussion Link: https://github.com/kubernetes/kubernetes/issues/45509
• Primary contact (assignee): @drbugfinder-work, @ahg-g
• Responsible SIGs: sig-apps
• Enhancement target (which target equals to which milestone):
  • Alpha release target (1.21):
  • Beta release target (1.22):
  • Stable release target (1.24):
• [x] Alpha
  • [x] KEP (k/enhancements) update PR(s): https://github.com/kubernetes/enhancements/tree/master/keps/sig-apps/2255-pod-cost
  • [x] Code (k/k) update PR(s): https://github.com/kubernetes/kubernetes/pull/99163
  • [x] Docs (k/website) update PR(s): https://github.com/kubernetes/website/pull/26739
• [x] Beta
  • [x] KEP (k/enhancements) update PR(s): https://github.com/kubernetes/enhancements/pull/2619
  • [x] Code (k/k) update PR(s): https://github.com/kubernetes/kubernetes/pull/101080, https://github.com/kubernetes/kubernetes/pull/101003
  • [x] Docs (k/website) update(s): https://github.com/kubernetes/website/pull/28417