There are certainly a few notable exceptions (Chrome and Android), but google3 really is a massive monorepo. It does contain forks of tons of open source code

There are certainly a few notable exceptions (Chrome and Android), but google3 really is a massive monorepo. It does contain forks of tons of open source code in the third party folder. I don't recall if the Linux kernel is in /third_party but I would not be surprisied if it is. A fair amount of the operations are actually documented publicly, ex. https://opensource.google/documentation/reference/thirdparty/ https://opensource.google/documentation/reference/thirdparty...