anchor.diff:      rev = "v${version}";
       owner = "grafana";
       repo = "loki";
  -    sha256 = "1anwq5dbh29dma18hnialbb253ciazzxmnqvympbh29ricldcf8p";
  +    sha256 = "0qqmxrbiph268i5c8i6wpcihspdcglfxd4hy6ag03bl66rciq8nb";
     };
   
     nativeBuildInputs = [ makeWrapper ];
  
positive.code: { stdenv, buildGoPackage, fetchFromGitHub, makeWrapper, systemd }:
  
  buildGoPackage rec {
    version = "0.4.0";
    pname = "grafana-loki";
    goPackagePath = "github.com/grafana/loki";
  
  
negative.code:   '';
  
    meta = with stdenv.lib; {
      description = "Like Prometheus, but for logs";
      license = licenses.asl20;
      homepage = "https://grafana.com/loki";
      maintainers = with maintainers; [ willibutz globin mmahut ];
      platforms = platforms.linux;
    };
  }
  