Kubernetes.container.cpu.usage.node.pct reports capacity rather than documented allocatable usage

[kevinsmithwrs]

According to the docs here:
https://www.elastic.co/guide/en/beats/metricbeat/current/exported-fields-kubernetes.html

The kubernetes.container.cpu.usage.node.pct and kubernetes.container.memory.usage.node.pct are supposed to report the node allocatable usage percentages, however they actually report node capacity percentages.

The relevant code is here:

beats/metricbeat/module/kubernetes/util/kubernetes.go

Line 627 in c773028

if cpu, ok := r.Status.Capacity["cpu"]; ok {

<Snip inline below?

	}
	switch r := r.(type) {
	case *kubernetes.Pod:
		return map[string]mapstr.M{id: specificMetaGen.Generate(r)}
	case *kubernetes.Node:
		nodeName := r.GetObjectMeta().GetName()
		metrics := NewNodeMetrics()
		if cpu, ok := r.Status.Capacity["cpu"]; ok {
			if q, err := resource.ParseQuantity(cpu.String()); err == nil {
				metrics.CoresAllocatable = NewFloat64Metric(float64(q.MilliValue()) / 1000)
			}
		}
		if memory, ok := r.Status.Capacity["memory"]; ok {
			if q, err := resource.ParseQuantity(memory.String()); err == nil {
				metrics.MemoryAllocatable = NewFloat64Metric(float64(q.Value()))
			}
		}
		nodeStore, _ := metricsRepo.AddNodeStore(nodeName)

Indeed changing the the code from "Capacity" to "Allocatable" in the line above fixes the problem. I notice the Memory usage calculation is also likewise incorrect on line 632 of the above source.

Can this be fixed please?

Thanks,

Kevin

For confirmed bugs, please report:

• Version:
  8.11.1 metricbeat container image.
• Operating System:
  Linux
• Discuss Forum URL:
  https://discuss.elastic.co/t/kubernetes-container-cpu-usage-node-pct-reports-capacity-rather-than-documented-allocatable-usage/360962/1
• Steps to Reproduce:
  Run metricbeat container with the kubernetes cpu metricset enabled.