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CKA study material · question 903 of 1000

A cluster uses a virtualisation-based container runtime, and kubectl top pod reports nothing for its Pods. What must the runtime provide?

  1. A cgroup hierarchy identical to runc's
  2. CRI container metrics
  3. A Prometheus endpoint on each node
  4. Its own metrics-server deployment
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Answer: B. CRI container metrics

cAdvisor reads figures from cgroups, so a runtime isolating workloads another way must implement CRI container metrics for the kubelet to have any numbers at all.

Source: Resource metrics pipeline (Kubernetes) — Resource metrics pipeline (overview)

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