> And pull requests can span across multiple repositories This bit is doing a lot of work here. How do you make commits atomic? Is there a central commit queu

> And pull requests can span across multiple repositories This bit is doing a lot of work here. How do you make commits atomic? Is there a central commit queue? Do you run the tests of every dependent repo? How do you track cross-repo dependencies to do that? Is there a central database? How do you manage rollbacks?