Looking at performance.wikimedia.org Apache config I noticed an entry for /xhprof that proxies to http://tungsten.eqiad.wmnet/xhprof/.
It appears to be some kind of XHProf viewer. Currently at https://performance.wikimedia.org/xhprof/.
It seems to only have one entry, from 2016, and I have no idea how to get things added to it.
As far as I know it's not part of the XHGui application that runs there, but something else. Possibly this might be the "public_html" viewer that came with the php5-xhprof package originally.
Anyhow, I propose we remove it, which will also make T195314 simpler.