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CKA study material · question 524 of 1000

A monitoring tool needs to detect a node going silent as early as possible. Which field does the control plane itself watch for that purpose?

  1. spec.renewTime on the node's Lease object
  2. status.conditions[].lastHeartbeatTime on the Node
  3. metadata.resourceVersion of the Node object
  4. status.nodeInfo.bootID on the Node
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Answer: A. spec.renewTime on the node's Lease object

Each kubelet heartbeat is an update to spec.renewTime on that node's Lease, and the control plane reads that timestamp to judge availability — which is why Leases were introduced alongside the heavier status updates.

Source: Leases (Kubernetes) — Node heartbeats

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