Autoscaling to zero

[mkjpryor]

/kind feature

Describe the solution you'd like
Auto-scaling to and from zero nodes has been implemented upstream - kubernetes/autoscaler#4840.

We should make sure that we implement the provider side of this contract.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

[braghettos]

Adding a +1 because it would be a great feature!

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[nikParasyr]

/remove-lifecycle stale

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[lukasmrtvy]

/remove-lifecycle stale

[mdbooth]

https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/proposals/20210310-opt-in-autoscaling-from-zero.md

[nikParasyr]

IIRC autoscaling from 0 already works, but it requires extra labels/annotations for the cluster-autoscaler. Implementing this would remove the need for these extra labels/annotations so it would be a bit easier for the user.

For me, this wouldnt be very high prio

[mkjpryor]

IIRC autoscaling from 0 already works, but it requires extra labels/annotations for the cluster-autoscaler. Implementing this would remove the need for these extra labels/annotations so it would be a bit easier for the user.

For me, this wouldnt be very high prio

This is correct I think. However I don't really want to have to query the flavor and add custom annotations to my machine deployment when a mechanism exists for the infrastructure provider to do this for me. Agree it isn't high, high priority but would certainly be good to implement the support since the hooks already exist in CAPI.

[k8s-triage-robot]

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/lifecycle stale

[nikParasyr]

/remove-lifecycle stale

[mdbooth]

@nikParasyr @mkjpryor Do either of you want to work on this, btw? Seems like a good feature.

[nikParasyr]

@mdbooth I dont have any time to work on this (unfortunately)

[EmilienM]

/remove-lifecycle stale

[mkjpryor]

@mdbooth We think a customer might be about to ask for this. If they do then we will work on it.

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[EmilienM]

/remove-lifecycle stale

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[Ritikaa96]

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