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* feat(helm): add per-component PodDisruptionBudget and topologySpreadConstraints to componentized chart The componentized chart (helm/litellm) had no PodDisruptionBudget template for the gateway, backend, or ui, so voluntary disruptions (node drains, Karpenter consolidation) could evict every replica of a component at once. The legacy chart shipped one out of the box. Deployments also had no way to configure topologySpreadConstraints, blocking HA spread across AZs. Adds a shared litellm.pdb helper rendered per component, gated on <component>.pdb.enabled with minAvailable/maxUnavailable (minAvailable wins, fallback maxUnavailable: 1), selectors matching each component's selectorLabels. Adds <component>.topologySpreadConstraints rendered into each Deployment pod spec. PDBs default to disabled since the default hpa.minReplicas of 1 with minAvailable: 1 would block drains entirely. Resolves LIT-4452 * fix(helm): honor explicit 0 in pdb minAvailable/maxUnavailable A Go-template truthy check treated an explicit 0 (forbid all voluntary disruptions via maxUnavailable: 0) as unset and silently replaced it with the fallback maxUnavailable: 1, weakening the configured protection. Treat a value as set when it is non-nil and non-empty-string instead. |
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