Code review comment for lp://qastaging/~doanac/utah/probes-from-host

> What is the UTAH_PROBE_DIR environment variable used for? I haven't seen it in
> any other place in the code.

It appears to be used by external scripts in other merges, such as this:
https://code.launchpad.net/~doanac/ubuntu-test-cases/system-settle-verbosity/+merge/181868