You are deploying the NVIDIA GPU Operator on a Kubernetes cluster that contains a mix of nodes: some with A100 GPUs, some with L40S GPUs, and some CPU-only nodes. After installation, you notice GPU workloads are occasionally being scheduled to CPU-only nodes where they fail to start. Which component of the GPU Operator stack is responsible for automatically labeling nodes with their GPU characteristics so the scheduler can place GPU pods only on GPU-equipped nodes?