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Apply CPU startup boost in admission controller if its set #8458

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Apply CPU startup boost in admission controller if its set #8458

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kamarabbas99
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@kamarabbas99 kamarabbas99 commented Aug 18, 2025 •
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What type of PR is this?

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Introduces changes in the admission-controller component to apply cpu startup boost if its set in the vpa spec.
Also the original cpu request is added in annotation to verify if the updater correctly reverts back to original state.

Special notes for your reviewer:

Depends on #8417
Will rebase once that is merged.

Does this PR introduce a user-facing change?

Users can now configure a startupBoost policy in the VPA spec.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

- [KEP]: (https://github.com/kubernetes/autoscaler/tree/master/vertical-pod-autoscaler/enhancements/7862-cpu-startup-boost#aep-7862-cpu-startup-boost)

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Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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@k8s-ci-robot k8s-ci-robot added kind/feature Categorizes issue or PR as related to a new feature. do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. do-not-merge/needs-area labels Aug 18, 2025
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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kamarabbas99
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Hi @kamarabbas99. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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@k8s-ci-robot k8s-ci-robot added needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. and removed do-not-merge/needs-area labels Aug 18, 2025
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/cc laoj2

@k8s-ci-robot k8s-ci-robot requested a review from laoj2 August 18, 2025 19:56
@kamarabbas99 kamarabbas99 changed the title Feature cpu ac Apply CPU startup boost in admission controller if its set Aug 18, 2025
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/ok-to-test

@k8s-ci-robot k8s-ci-robot added ok-to-test Indicates a non-member PR verified by an org member that is safe to test. and removed needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. labels Aug 18, 2025
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This PR contains similar changes to #8417
I thought the plan was to split up into multiple changes?

Could we get #8417 merged first?

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@adrianmoisey yes I plan to rebase this once that PR is merged!

@k8s-ci-robot k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Aug 24, 2025
@k8s-ci-robot k8s-ci-robot added size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. and removed needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. labels Aug 25, 2025
adrianmoisey
adrianmoisey reviewed Aug 27, 2025
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I haven't gone over this in detail yet, just left some nits

@kamarabbas99 kamarabbas99 force-pushed the feature-cpu-ac branch 2 times, most recently from 84a2832 to 0e13cb9 Compare August 28, 2025 19:04
omerap12
omerap12 reviewed Sep 7, 2025
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vertical-pod-autoscaler/pkg/admission-controller/main.go
@@ -78,6 +79,7 @@ var (
registerWebhook = flag.Bool("register-webhook", true, "If set to true, admission webhook object will be created on start up to register with the API server.")
webhookLabels = flag.String("webhook-labels", "", "Comma separated list of labels to add to the webhook object. Format: key1:value1,key2:value2")
registerByURL = flag.Bool("register-by-url", false, "If set to true, admission webhook will be registered by URL (webhookAddress:webhookPort) instead of by service name")
maxAllowedCPU = flag.String("container-recommendation-max-allowed-cpu", "", "Maximum amount of CPU that will be recommended for a container.")
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@omerap12 omerap12 Sep 7, 2025 •
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We already have this https://github.com/kubernetes/autoscaler/blob/master/vertical-pod-autoscaler/pkg/recommender/main.go#L129-L130. I know this is the admission-controller but it feels off to have duplicated flags. also, what will happen if those values are different?

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How about container-recommendation-max-allowed-cpu-boost? this only applied to startup boost so shouldnt matter if its different, right?

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What about max-allowed-cpu-boost ?

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