bors link in CONTRIBUTING.md is a dead link. (Link does not finish loading and times out.) It links to buildbot.rust-lang.org, which should be buildbot2.rust-lang.org. I guess this should be fixed.
On the other hand, why are we having buildbot2.rust-lang.org? Does anything use original buildbot.rust-lang.org somehow? Shouldn’t buildbot.rust-lang.org address point to the buildbot2.rust-lang.org machine?