Details of the TPU node(s) being requested. Users can request either a single node or multiple nodes. NodeSpec provides the specification for node(s) to be created.
The unqualified resource name. Should follow the ^[A-Za-z0-9_.~+%-]+$ regex format. This is only specified when requesting a single node. In case of multi-node requests, multi_node_params must be populated instead. It's an error to specify both node_id and multi_node_params.