Review a rolling update that cannot afford lost capacity.

Instruction: Calculate rollout capacity and explain the protection a disruption budget does and does not provide.

Context:

A fictional stateless Deployment has four ready replicas. Four are required for the current load. The cluster has room for one additional replica. Proposed rolling settings are maxSurge: 1 and maxUnavailable: 0. A PodDisruptionBudget requires at least three available Pods. New Pods take 45 seconds to become ready.

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The proposed rolling settings can add one replica before retiring an old one, keeping the desired four available during a healthy rollout...

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