{config, ...}: let
  nodeExporterPort = config.m3ta.ports.get "node-exporter";
in {
  services.prometheus.exporters.node = {
    enable = true;
    port = nodeExporterPort;
    listenAddress = "127.0.0.1";
    enabledCollectors = [
      "systemd"
      "diskstats"
      "filesystem"
    ];
    openFirewall = false; # localhost only; prometheus scrapes via 127.0.0.1
  };
}