anchor.diff:      inherit rev;
       owner = "prometheus";
       repo = "alertmanager";
  -    sha256 = "1k30v0z5awnd6ys2ybc2m580y98nlifpgl7hly977nfhc6s90kvh";
  +    sha256 = "1z0f8jqbd4v00634qcs41h1zb70ahl63svlzn33gavripk84hwzq";
     };
   
     # Tests exist, but seem to clash with the firewall.
  
positive.code: { stdenv, lib, go, buildGoPackage, fetchFromGitHub }:
  
  buildGoPackage rec {
    name = "alertmanager-${version}";
    version = "0.5.0";
    rev = "v${version}";
  
    goPackagePath = "github.com/prometheus/alertmanager";
  
negative.code:     description = "Alert dispatcher for the Prometheus monitoring system";
      homepage = https://github.com/prometheus/alertmanager;
      license = licenses.asl20;
      maintainers = with maintainers; [ benley fpletz ];
      platforms = platforms.unix;
    };
  }
  