pods := m.activePods()
	burstablePodCPURequest := int64(0)
	reuseReqs := make(v1.ResourceList, 4)
	for i := range pods {
		pod := pods[i]
		qosClass := v1qos.GetPodQOS(pod)
		if qosClass != v1.PodQOSBurstable {
			// we only care about the burstable qos tier
			continue
		}
		req := resource.PodRequests(pod, resource.PodResourcesOptions{Reuse: reuseReqs})

	}
	if len(apiPodStatus.PodIPs) > 0 {
		apiPodStatus.PodIP = apiPodStatus.PodIPs[0].IP
	}

	// set status for Pods created on versions of kube older than 1.6
	apiPodStatus.QOSClass = v1qos.GetPodQOS(pod)

	apiPodStatus.ContainerStatuses = kl.convertToAPIContainerStatuses(
		pod, podStatus,
		oldPodStatus.ContainerStatuses,
		pod.Spec.Containers,
		len(pod.Spec.InitContainers) > 0,
		false,
	)

  It reduces the number of kinds of cluster events the scheduler needs to subscribe/handle. ([#121571](https://github.com/kubernetes/kubernetes/pull/121571), [@sanposhiho](https://github.com/sanposhiho))