Add a configurable default constraint to PodTopologySpread

[alculquicondor]

Enhancement Description

• One-line enhancement description: Add default spreading rules to pods that don't define one and allow operators to define it.
• Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/tree/master/keps/sig-scheduling/1258-default-pod-topology-spread
• Main repo issue: [Scheduler] Default spreading should be configurable for a topology kubernetes#80639
• Primary contact (assignee): @alculquicondor
• Responsible SIGs: sig-scheduling
• Enhancement target (which target equals to which milestone):
  • Alpha release target (1.19)
  • Beta release target (1.20)
  • Stable release target ()

[alculquicondor]

/sig scheduling

[mrbobbytables]

Hey there @alculquicondor -- 1.17 Enhancements lead here. I wanted to check in and see if you think this Enhancement will be graduating to alpha in 1.17?

Just a reminder that for it to be accepted -- the KEP must be merged, in an implementable state and have both a test plan and graduation criteria defined before the Enhancement Freeze.

The current release schedule is:

• Monday, September 23 - Release Cycle Begins
• Tuesday, October 15, EOD PST - Enhancements Freeze
• Thursday, November 14, EOD PST - Code Freeze
• Tuesday, November 19 - Docs must be completed and reviewed
• Monday, December 9 - Kubernetes 1.17.0 Released

If you do think it'll make it, please let me know.

Thanks!

[alculquicondor]

Hi Bob. I believe I'll have it ready before the Enhancements Freeze.

/assign

[mrbobbytables]

great, thanks @alculquicondor I'll add it to the tracking sheet :)
/stage alpha
/milestone v1.17

[jeremyrickard]

Hey @alculquicondor, friendly reminder that enhancement freeze is quickly approaching (EOD PT, October 15th). Your KEP will need to be updated to the implementable state in order for us to include it in the release. It looks like it was merged, but is still listed as provisional.