anchor.diff:  { stdenv, buildGoPackage, fetchFromGitHub, makeWrapper, systemd }:
   
   buildGoPackage rec {
  -  version = "0.4.0";
  +  version = "1.0.0";
     pname = "grafana-loki";
     goPackagePath = "github.com/grafana/loki";
   
  
positive.code:   '';
  
    meta = with stdenv.lib; {
      description = "Like Prometheus, but for logs.";
      license = licenses.asl20;
      homepage = "https://grafana.com/loki";
      maintainers = with maintainers; [ willibutz globin ];
      platforms = platforms.linux;
    };
  }
  
negative.code:     rev = "v${version}";
      owner = "grafana";
      repo = "loki";
      sha256 = "0qqmxrbiph268i5c8i6wpcihspdcglfxd4hy6ag03bl66rciq8nb";
    };
  
    nativeBuildInputs = [ makeWrapper ];
  