What are the hardware details of the Hydra build farm?

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What are the current hardware details of the Hydra build farm hosted at https://hydra.nixos.org/?

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Hi,

Most of the hydra.nixos.org config is in nixos-org-configurations/delft at master · NixOS/nixos-org-configurations · GitHub.

Afaik, the frontend is a Hetzner machine and the builders are a set of sponsored machines from Packet/Rackspace/… (Hydra - Machine status) and EC2 m4.xlarge provisioned ones (nixos-org-configurations/hydra-provisioner at master · NixOS/nixos-org-configurations · GitHub) using the hydra-provisioner script.

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Additionally:

More parts are missing there AFAIK, e.g. the darwin machines (probably mac minis), but I just don’t know well other information.