error:
       … while evaluating the attribute 'optionalValue.value'
         at «github:nixos/nixpkgs/d407951447dcd00442e97087bf374aad70c04cea?narHash=sha256-8i/87eeoqiGE4yOTjwSA3Eh/ziJRQEmd/unYU%2BK27sk%3D»/lib/modules.nix:1312:5:
         1311|
         1312|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |     ^
         1313|   };

       … while evaluating a branch condition
         at «github:nixos/nixpkgs/d407951447dcd00442e97087bf374aad70c04cea?narHash=sha256-8i/87eeoqiGE4yOTjwSA3Eh/ziJRQEmd/unYU%2BK27sk%3D»/lib/modules.nix:1312:21:
         1311|
         1312|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |                     ^
         1313|   };

       … while evaluating definitions from `/nix/store/xfg4bws749i95jvnxhymxmfwailzk38q-source/modules/transposition.nix':

       … while evaluating definitions from `/nix/store/xrn4s2qbps33n5mq5hzig7hrfbjhn29s-source/flake.nix, via option perSystem':

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/ifpab9hxqmk2biwy594da8ipxzsp3y4s-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `warnings':

       … while evaluating definitions from `/nix/store/ifpab9hxqmk2biwy594da8ipxzsp3y4s-source/nixos/modules/system/boot/systemd.nix':

       … while evaluating the option `systemd.services.prometheus.serviceConfig':

       … while evaluating definitions from `/nix/store/ifpab9hxqmk2biwy594da8ipxzsp3y4s-source/nixos/modules/services/monitoring/prometheus/default.nix':

       … while evaluating the option `services.prometheus.scrapeConfigs."[definition 1-entry 1]".static_configs."[definition 1-entry 1]".targets':

       … while evaluating definitions from `/nix/store/xrn4s2qbps33n5mq5hzig7hrfbjhn29s-source/clanServices/prometheus/default.nix, via option flake.clan._services.allServices."self-@rpqt/prometheus".roles.scraper.perInstance, via option nixosModule':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: attribute 'zerotier' missing
       at /var/lib/nixbot/worktrees/2-22162c52bf4b-ec7e579d/clanServices/prometheus/default.nix:51:40:
           50|                           targetConfig = self.nixosConfigurations.${machineName}.config;
           51|                           targetHost = targetConfig.clan.core.vars.generators.zerotier.files.zerotier-ip.value;
             |                                        ^
           52|                         in