NVIDIA's open-source (Apache-2.0) orchestration layer, Rust for the performance path and Python for extensibility. It explicitly does not replace SGLang, TensorRT-LLM or vLLM - it wires them into a coordinated multi-node system: disaggregated prefill/decode, KV-aware routing (2x faster TTFT on Qwen3-Coder 480B), KVBM offloading KV cache to CPU/SSD/remote, ModelExpress streaming weights over NVLink for 7x faster cold starts, an SLA-driven Planner (80% fewer breaches at 5% lower TCO in Alibaba production), and Grove for topology-aware NVL72 scheduling.