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: KEP-2021: Support scaling HPA to/from zero pods for object/external metrics #2022
• 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 (x.y)
  • Stable release target (x.y)

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

[AlbertMarashi]

kubernetes/kubernetes#69687 (comment)

Looks like lots of users want this. +1 for seeing this get into beta

This seems like a very common use-case for building serverless-like services

[gjtempleton]

Hey, we're aware that a lot of people want to see this feature make it to beta and that's great to see!

As can be seen in the associated PR ( #2022 ) there's some interactions with existing functionality that solutions have had to be found for, but progress is being made on this. If anyone wants to help drive this work forward, your feedback on the KEP PR is welcome, or feel free to reach out to us in the #sig-autoscaling channel in the Kubernetes slack.

(As a side note, if you're simply wanting to see this feature graduate to beta/GA, can you just give the initial comment a 👍 rather than adding further comments.)

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[johanneswuerbach]

/remove-lifecycle stale

[k8s-triage-robot]

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[pierluigilenoci]

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[k8s-triage-robot]

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[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues and PRs.

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[pierluigilenoci]

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[saty9]

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[gjtempleton]

/remove-lifecycle rotten

[k8s-triage-robot]

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[saty9]

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[k8s-triage-robot]

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[gjtempleton]

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[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

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[pierluigilenoci]

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[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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[saty9]

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