"hydra-queue-runner --status" now prints how many runnable and running build steps exist for each machine type. This allows additional machines to be provisioned based on the Hydra load.
To start hacking on Hydra, run:
$ ./dev-shell
$ ./configure $configureFlags --prefix=/opt/hydra
$ make
$ make install
Or, if you just want to build from source (on x86_64-linux):
$ nix-build -A build.x86_64-linux release.nix
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