kubernetes-sigs / karpenter / 22731997742

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main: 80%

Build Type

Pull #2894

github

Committed by nathangeology

Commit Message

feat(pod): Add feature-gated pod deletion cost management controller

Introduce a new controller that manages pod-deletion-cost annotations
on pods scheduled to Karpenter-managed nodes. This influences which
pods the Kubernetes scheduler prefers to evict during consolidation,
enabling smarter disruption decisions.

The controller is gated behind the PodDeletionCostManagement feature
flag (default: disabled) and supports configurable ranking strategies:
- Random: random cost assignment
- LargestToSmallest: prefer evicting larger pods first
- SmallestToLargest: prefer evicting smaller pods first
- UnallocatedVCPUPerPodCost: rank by unallocated vCPU per pod

Key components:
- controller.go: reconciliation loop watching Karpenter nodes
- ranking.go: pluggable ranking strategies for cost calculation
- annotation.go: pod annotation management with batch updates
- changedetector.go: optimization to skip unchanged node states
- events.go/metrics.go: observability for ranking operations

Infrastructure changes:
- Add PodDeletionCostManagement feature gate to options.go
- Add ranking strategy and change detection CLI flags
- Register controller conditionally in controllers.go
- Add pod update/patch RBAC to kwok clusterrole
- Add example env vars to kwok chart values

Pull Request Pull Request #2894: feat: Add feature-gated pod deletion cost management controller

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