In the JDK project's hotspot areas (usually indicated by hotspot, hotspot-gc, hotspot-compiler, hotspot-runtime), there is a requirement of 2 reviewers by default. Skara should be able to support this default, either as a side effect of addition of these label, or some other logic in the .jcheck/conf files.

Hotspot has many external contributors, so having the 2 reviewer requirement explicitly indicated by the bots would be much helpful.