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HPA support for pod-level resource specifications #132237

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HPA support for pod-level resource specifications#132237
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laoj2
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kind/featureCategorizes issue or PR as related to a new feature.sig/autoscalingCategorizes an issue or PR as relevant to SIG Autoscaling.triage/acceptedIndicates an issue or PR is ready to be actively worked on.
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@laoj2
laoj2
opened on Jun 11, 2025

What would you like to be added?

With k8s 1.34, PodLevelResources will allow users to specify resources on Pod level instead of on Container level. More info on how this works in the KEP

This is a placeholder/umbrella issue, similar to VPA's kubernetes/autoscaler#7571

Why is this needed?

HPA needs to be able to correctly calculate the resources requested by a pod, when it's defined at pod or container level. Today, it calculates the pod requests by aggregating the requests of all containers within a pod:

kubernetes/pkg/controller/podautoscaler/replica_calculator.go

Lines 452 to 475 in 988cf21

func calculatePodRequests(pods []*v1.Pod, container string, resource v1.ResourceName) (map[string]int64, error) {
requests := make(map[string]int64, len(pods))
for _, pod := range pods {
podSum := int64(0)
// Calculate all regular containers and restartable init containers requests.
containers := append([]v1.Container{}, pod.Spec.Containers...)
for _, c := range pod.Spec.InitContainers {
if c.RestartPolicy != nil && *c.RestartPolicy == v1.ContainerRestartPolicyAlways {
containers = append(containers, c)
}
}
for _, c := range containers {
if container == "" || container == c.Name {
if containerRequest, ok := c.Resources.Requests[resource]; ok {
podSum += containerRequest.MilliValue()
} else {
return nil, fmt.Errorf("missing request for %s in container %s of Pod %s", resource, c.Name, pod.ObjectMeta.Name)
}
}
}
requests[pod.Name] = podSum
}
return requests, nil
}

We could use https://github.com/kubernetes/kubernetes/blob/988cf21f0975cf95444a619481c13d2503d8ec6a/staging/src/k8s.io/component-helpers/resource/helpers.go, to calculate the pod requests in HPA.

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kind/featureCategorizes issue or PR as related to a new feature.sig/autoscalingCategorizes an issue or PR as relevant to SIG Autoscaling.triage/acceptedIndicates an issue or PR is ready to be actively worked on.

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