1) This is mostly dependent on language and the rules available. In our case python is a mess regarding 2/3 compatibility and external dependencies. There is a

1) This is mostly dependent on language and the rules available. In our case python is a mess regarding 2/3 compatibility and external dependencies. There is a roadmap being executed on to fix these issues. Regarding our transition, it was slow at first as we pulled in services and tackled some tech debt. We wrote a handful of custom rules that helped. Bazel does have the ability to import repositories and that can be used as a little bit of a crutch in the process. 2. Exactly the same process except there is a single pr instead of multiple across multiple repositories. One of our challenges was integrating one of our public repos into our repo and that is more of a difference in release patterns(semantic versioning vs nightlies). We use copybara to help with this problem. - https://github.com/google/copybara https://github.com/google/copybara