Volcano v1.15 Released: Gang-Granularity Preemption, DRA Queue Quota, and More Scheduling Enhancements

Volcano v1.15.0 introduces gang-aware preemption that evaluates resource decisions at job granularity rather than individual pods, reducing disruption in distributed training workloads. The release also adds DRA queue quota support, a benchmark framework for performance testing, pluggable multi-sharding policies, scheduling gates for queue admission, and Kubernetes 1.35 compatibility.