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Re:Adding Mercurial support to Gitlab by MikusR on Thursday September 20, 2018 @05:07AM (#18030807)
Google does not use Git for its monorepo.
Re:Adding Mercurial support to Gitlab by qznc on Thursday September 20, 2018 @01:57PM (#18034310)
Afaik Googlers can use git client-side. The central repo is certainly not git though.

Also parts of Google, like Chrome, Android, and Go, do use git.