this derivation will be built:
  /nix/store/9w6k45kh7ggdrmbzj7l2qnqi2lhnsl42-check-backlog-md.drv
building '/nix/store/9w6k45kh7ggdrmbzj7l2qnqi2lhnsl42-check-backlog-md.drv' on 'grpc://farm.numtide.com:50051?client-cert=/run/secrets/vars/per-machine/bld1/nix-farm-ci/crt&client-key=/run/secrets/vars/per-machine/bld1/nix-farm-ci/key&connect-timeout=22&system=aarch64-linux'
9w6k45kh7ggdrmbzj7l2qnqi2lhnsl42-check-backlog-md.drv: bld4: not scheduled here: 9w6k45kh7ggdrmbzj7l2qnqi2lhnsl42-check-backlog-md.drv, asking the scheduler again
building '/nix/store/9w6k45kh7ggdrmbzj7l2qnqi2lhnsl42-check-backlog-md.drv' on farm.numtide.com:50051
check-backlog-md> bld3: building 9w6k45kh7ggdrmbzj7l2qnqi2lhnsl42-check-backlog-md.drv

upload niks3: ok