Tune ardac1prd Karpenter disruption settings

[alan-walsh]

Summary

• reduce default Karpenter voluntary disruption by changing ardac1prd default consolidation to WhenEmpty
• exclude nano, micro, and small instance sizes from the default Karpenter NodePool
• enable Gen3 PDBs and hard per-node topology spread for supported multi-replica services

Validation

• helm lint passed for Gen3 chart with ardac1prd portal values
• helm lint passed for cluster-level-resources chart with ardac1prd cluster values
• helm template confirmed PDB minAvailable 1 and DoNotSchedule hostname topology spread
• helm template confirmed default NodePool renders instance-size NotIn nano micro small and WhenEmpty consolidation
• git diff --check passed

Notes

• yamllint still reports pre-existing CRLF line endings and comment-spacing warnings in the edited YAML files; this PR avoids broad formatting churn

[Copilot]

Pull request overview

This PR adjusts production (ardac1prd) configuration to reduce Karpenter voluntary disruption while improving workload resilience during node maintenance/conpression by enabling PodDisruptionBudgets (PDBs) and enforcing per-node topology spread where supported by the Gen3 chart.

Changes:

• Enable Gen3 PDBs in ardac1prd portal values with minAvailable: 1, and configure hostname-based topology spread with DoNotSchedule.
• Reduce default Karpenter consolidation aggressiveness by switching consolidation policy to WhenEmpty.
• Exclude nano, micro, and small EC2 instance sizes from the default Karpenter NodePool requirements.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ardac1prd/portal.ardac.org/values.yaml	Enables PDBs and configures hostname topology spread defaults for supported services.
ardac1prd/cluster-level-resources/cluster-values.yaml	Tunes default Karpenter disruption/consolidation and filters out small instance sizes.

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