I use Raritan PDUs that do this per outlet. What size do you want? What voltage?
The old 1U units (DPXR8-15) are EOL but work fine.
The newer 1U units (PX3-5145R) are new but $$$.
1U is fine, it doesn't need to be zero U mountable since it's for a lab.
Voltage would be standard 110V I guess. I won't be loading it up with more than 12 amps.
The other recommendations look great but too costly. I have some APC PDUs that have amperage display and some networking capability but nothing robust and it's not per outlet.
Since I may not be able to use PMBus capability with my SM whitebox builds, I wanted to be able to measure per device consumption without resorting to a bunch of kill-a-watt meters or something.
The DPXR8-15 looks great.