* 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>
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Felix Kunde <felix-kunde@gmx.de>
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