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* Use maxUnavailable for the critical-op PDB to stop idle alert noise The critical-op PDB is created with minAvailable equal to numberOfInstances while its selector (critical-operation=true) matches no pods during normal operation. This leaves status.desiredHealthy at N and currentHealthy at 0 permanently, so monitoring stacks fire alerts like kube-prometheus-stack's KubePdbNotEnoughHealthyPods for every idle cluster (#3020). maxUnavailable: 0 provides the same protection while a critical operation is running - no voluntary evictions of labeled pods - but keeps the budget satisfied (desiredHealthy 0) when nothing matches. When PDBs are disabled or there are no instances, the budget relaxes to maxUnavailable 100% instead of minAvailable 0. Fixes #3020 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * Update PDB docs for critical-op maxUnavailable semantics Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * Clarify why the two PDBs use different budget fields Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com> Co-authored-by: Felix Kunde <felix-kunde@gmx.de>