One of the big innovations of NVMe over SATA was giving us a bunch of separate command queues. It'd be lovely to get some per queue information.

I feel like maybe some of this info is already available we just don't commonly look at it: knowing how deep the queue is, how many commands are outstanding at any given moment is probably a decent start. I haven't spent time digging into blk-mq to see what's available, to understand the hardware dispatch queue (how the kernel represents the many hardware queues available) info. https://www.kernel.org/doc/html/v5.16/block/blk-mq.html