This is currently not enabled which makes testing or staging of deployments affecting noc.wikimedia.org not possible. This is quite counter-intuitive given that virtually everything else that this repo is responsible for is served from regular app servers and mwdebug.
Some years ago, it was changed from being served directly by fenari (at the time, the equivalent of mwdebug) to being served by app servers (I think? not sure) and now it is served by mwmaint* servers.