Support ignoring specific pods when calculating consolidateAfter

[rkilingr]

Description

Observed Behavior:
We have a bunch of cronjobs running on a namespace with a maximum frequency of every 15m. Karpenter seems to be taking that into account on field lastPodEventTime preventing the node to be considered as Consolidatable

Expected Behavior:
CronJobs and ephemeral pods should not prevent node consolidation

Reproduction Steps (Please include YAML):
Have a nodepool with a spec.disruption.consolidateAfter field set to a duration longer than cronjob frequency, example 60m

Versions:

• Chart Version: v1.0.6
• Kubernetes Version (kubectl version): Server Version: version.Info{Major:"1", Minor:"30+", GitVersion:"v1.30.8-eks-2d5f260", GitCommit:"3c9802b10b3530b22ddb4727e2931f6b89bbb760", GitTreeState:"clean", BuildDate:"2024-12-12T23:09:04Z", GoVersion:"go1.22.9", Compiler:"gc", Platform:"linux/amd64"}

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[sftim]

This sounds like a feature you'd like Karpenter to implement: a way to protect a node from consolidation to protect managed Jobs (eg managed by a CronJob).

The behaviour you've stated as expected isn't something we document as available.

[engedaam]

/assign @rschalo

[jonathan-innis]

/kind feature

[jonathan-innis]

This is behaving as the feature is intended to behave. The current goal of consolidateAfter is that we keep nodes around for some amount of time until we have determined that there is no churn on that node and that it is safe to remove. This sounds like a feature request like @sftim to have something like an annotation for ignoring pods due to consolidateAfter

[jonathan-innis]

/retitle Support ignoring specific pods when calculating consolidateAfter

[jonathan-innis]

/remove-kind bug

[jonathan-innis]

/triage accepted
/priority awaiting-more-evidence