Workload API - Core Implementation

[davidLif]

Implement core Kubernetes Workload API (KEP-4671) support in KAI Scheduler.

Design document: KAI-Scheduler/docs/developer/designs/k8s-workload-api/README.md at db3ed702554ae7769763bfbe8dc4ac60125a2a46 · kai-scheduler/KAI-Scheduler

Scope
Import/vendor Kubernetes Workload API types (scheduling.k8s.io/v1alpha1)

Enable the scheduler to watch and cache Workload resources

Create a new Workload plugin in the podgrouper:

Detect pods with spec.workloadRef

Generate KAI PodGroup names: {workload}-{podGroup}-{replicaKey?}

Translate gang.minCount → MinMember (or 1 for basic policy)

Implement layered metadata calculation (Workload → Top Owner → Pod)

Ensure correct plugin ordering: top owner plugin first, then Workload plugin overrides

Acceptance Criteria
Pods with workloadRef are grouped into correct KAI PodGroups

Gang policy minCount correctly maps to MinMember

Basic policy creates PodGroup with MinMember=1

Metadata inheritance follows the defined fallback chain

Recommendation

Try to add this as an issue in the bot repo, and see what will it do.