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What fraction of Google's code is in the monorepo these days? Android, Chrome, and ChromeOS are not, and those are certainly large projects.

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I believe anything not open source, or reasonably expected to become open source.

Plenty of opensource projects are in google3(that frequently gets merged into external)

+1. Many OSS projects live in google3 (e.g. gRPC, protobufs, etc.)

Yep. Projects use Copybara to import/export OSS code. https://github.com/google/copybara

I think that's an effect, not a cause. It's annoying to open source google3 code because it means untangling dependencies. Meanwhile Android has lots of SOC-specific and other development happening behind the wall. So the open source question seems orthogonal.

Google today has separate repos (android, chrome, chromeos, google3), each with its own build system: Gradle, gyp/ninja, Portage, Blaze. There's hysterical raisins, but I wonder if Google considers it to be a good thing these projects are so different, or a wart they would prefer to fix?

I'd bet pretty much everything that runs in Google data centers.

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