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From what I remember, prodkernel actually was outside google3 (the monorepo), and has been sitting in a git repository.

Builds are all derived from the monorepo, but git makes sense for development as they have to constantly merge upstream git commits.

Prodkernel is not in the monorepo - it's in a separate git repo and uses it's own systems for building and qualifying new releases.

There is a system for using git* in conjunction with the monorepo that some developers use, but that system has nothing to do with the prodkernel.

* there is also a similar system for using mecurial with the monorepo that some folks love.