Thank you for spotting that file.
It is poor/sloppy file dumping by the developers! I see that I have one from 27th April on a CWP Pro instance - now deleted.
A relatively recent install of CWP doesn't have the file.
Goes off to check other servers..
There's also a razor-agent.log file in root
Edit: It looks as though older CWP instances have that file but newer installs don't.
Without changelogs we (users/
customers) will never know.