{
  extraModules,
  pkgs,
  vhack,
  ...
}: let
  prometheusMain = "prometheus.server2.server.org";
  remoteWriteTo = {
    url = "https://${prometheusMain}";
  };
  promPort = 3001;
in
  vhack.runTest {
    name = "monitoring";

    serverDomains = [
      {server2 = prometheusMain;}
    ];

    nodes = {
      server2 = {config, ...}: {
        imports =
          extraModules
          ++ [
            ../../../../modules
          ];

        environment.systemPackages = [
          pkgs.curl
        ];

        vhack = {
          monitoring = {
            prometheus = {
              enable = true;
              port = promPort;
              remoteWriteReceiver = prometheusMain;
            };
          };
        };
      };
      server3 = {config, ...}: {
        imports =
          extraModules
          ++ [
            ../../../../modules
          ];

        vhack = {
          monitoring = {
            prometheus = {
              enable = true;
              port = promPort;
              inherit remoteWriteTo;
            };
          };
        };
      };
      server4 = {config, ...}: {
        imports =
          extraModules
          ++ [
            ../../../../modules
          ];

        vhack = {
          monitoring = {
            prometheus = {
              enable = true;
              port = promPort;
              inherit remoteWriteTo;
            };
          };
        };
      };
    };

    services = [
      {server2 = "prometheus.service";}
      {server3 = "prometheus.service";}
      {server4 = "prometheus.service";}
    ];

    testScript = {...}:
    # Python
    ''
      import json, time

      # Give the Prometheus servers some time to generate metrics and sync with the main
      # one.
      time.sleep(1)

      metrics = server2.succeed("${pkgs.writeShellScript "query-metrics" ''
        curl --silent \
          http://127.0.0.1:${toString promPort}/api/v1/query?query="go_gc_cleanups_queued_cleanups_total"
      ''}")

      metrics = json.loads(metrics)

      hosts = []
      for result in metrics["data"]["result"]:
        server2.log(json.dumps(result,indent=4))
        hosts.append(result["metric"]["hostname"])

      hosts.sort()

      assert hosts == ["server2", "server3", "server4"], f"Not all hosts used the remote write (got {hosts})"
    '';
  }