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Disruptions and the PodDisruptionBudget

Pods vanish in two very different ways: involuntary (the node dies, runs out of RAM — no one can stop it) and voluntary (draining a node for maintenance, upgrade — deliberate). A PodDisruptionBudget only guards the second kind: it tells the cluster not to take down too many replicas at once. This article distinguishes the two kinds of disruption then verifies a PDB with the real Eviction API — seeing an evict blocked with HTTP 429 firsthand.