Bors is also very similar to the Zuul CI system used for OpenStack. It has the equivalent of a merge queue (with additional support for cross repositories depen

Bors is also very similar to the Zuul CI system used for OpenStack. It has the equivalent of a merge queue (with additional support for cross repositories dependencies): https://zuul-ci.org/docs/zuul/latest/gating.html https://zuul-ci.org/docs/zuul/latest/gating.html You can then have pull requests from different repositories all serialized in the same queue ensuring you don't break tests from any of the repositories participating.