Reserved at IANA; in practice the Buildbot master's web interface.
IANA marks 8010 Reserved rather than assigning it, which leaves the number to convention. Buildbot's own tutorial has you open http://localhost:8010/ after starting a master, so a CI host with 8010 open is very often a Buildbot. Nmap's database labels it xmpp for XMPP file transfer, another historical use. Both are guesses until you read the response.
Expose with care
A Buildbot web UI shows build logs, worker names and configuration to anonymous visitors unless authentication is configured, and build output routinely contains internal hostnames and secrets.
$ curl -sI http://TARGET:8010/Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.