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gardener / autoscaler

Customised fork of cluster-autoscaler to support machine-controller-manager
Apache License 2.0
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Automated cherry pick of #160 on rel-v1.20: No scale down during rolling update #210

Closed himanshu-kun closed 1 year ago

himanshu-kun commented 1 year ago

What this PR does / why we need it: This PR adds changes to avoid any scale-down (scale-down due to underutilization was already stopped earlier using the scale-down-disabled annotation) like removal of longUnregistered nodes or removal of registered but long not Ready nodes.

Which issue(s) this PR fixes: Fixes #30

Special notes for your reviewer: Part of fix as per solution proposed here

Logic relies on the Progressing condition of machineDeployment.

Release note:

- Autoscaler would not scale-down if the node-grp(i.e. machineDeployment) is under rolling update. 
- Logic of fixing up the node grp size for node grp, whose current size not equals expected size for long time , is also disabled.
himanshu-kun commented 1 year ago

/close as this is no longer supported by Gardener