[plantsbeans]

I believe the commenter is referring to system where you take a giant “git sed” and automate a rather complicated process: 1. break up one huge diff into a set of many (hundreds or thousands) patches, where each individual patch only touches files in a particular subsystem. 2. send all those patches to the appropriate system owners and run the appropriate tests. 3. manage the actual merging of successful patches, as well as communicating to the original author any individual patches that might need more attention e.g. based on patch review feedback.

as you might imagine, it’s probably a pretty involved process to touch thousands of lines of code in a complicated system.