
With local-fs.target part of sysinit.target (https://github.com/NixOS/nixpkgs/pull/61321), we don't need to add it explicitly to certain units anymore, and can change dependencies like they are in other distros (I picked from Google's official CentOS 7 image here). Like them, use StandardOutput=journal+console to pipe google-*.service output to the serial console as well.
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