Support scaling to/from zero pods for object/external metrics

[johanneswuerbach]

Enhancement Description

• One-line enhancement description (can be used as a release note): HPA supports scaling to/from zero pods for object/external metrics

• Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/blob/master/keps/sig-autoscaling/2021-scale-from-zero/README.md

• Discussion Link: Allow HPA to scale to 0 kubernetes#69687 (comment)

• Primary contact (assignee): @johanneswuerbach

• Responsible SIGs: sig/autoscaling

• Enhancement target (which target equals to which milestone):

  • Alpha release target (1.16)
  • Beta release target (1.37)
  • Stable release target (x.y)

• Alpha

  • KEP (k/enhancements) update PR(s):
    • KEP-2021: Support scaling HPA to/from zero pods for object/external metrics #2022
    • KEP-2021: Update target version to 1.36 #5884
  • Code (k/k) update PR(s):
    • KEP-2021: HPA condition based scaling to zero kubernetes#135118
  • Docs (k/website) update PR: No doc updates needed

• Beta

  • KEP (k/enhancements) update PR(s):
    • KEP-2021: Promote to beta #6025
  • Code (k/k) update PR(s):
    • KEP-2021: Promote HPAScaleToZero feature gate to beta kubernetes#139648
  • Docs (k/website) update PR:
    • KEP-2021: Explain scale-to-zero website#56289

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

[johanneswuerbach]

/sig autoscaling

[kikisdeliveryservice]

Hi @johanneswuerbach

1.20 Enhancements Lead here checking in. Do you intend to go beta in 1.20? If so, please note that the Enhancements Freeze is October 6th, by which time your KEP should be:

• implementable
• have test plans
• have graduation criteria.

I left a comment on your KEP with some notes to bring it to the correct dir structure. Let me know if you have any questions.

Best,
Kirsten

[kikisdeliveryservice]

Enhancements Freeze is now in effect. If you wish to be included in the 1.20 Release, please submit an Exception Request as soon as possible.

[fejta-bot]

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[johanneswuerbach]

/remove-lifecycle stale

[jamesbrooks94]

/remove-lifecycle stale

Any news on this?

[patricksu]

Would love to see feature to beta