nixos-config/modules/prometheus/node_exporter.nix

{ config, ... }:

let
  vpnNetRanges = config.networking.wireguard.interfaces.wg-home.ips;
  vpnNetRange = builtins.elemAt vpnNetRanges 0;
  vpnAddress = builtins.elemAt (builtins.split "/" vpnNetRange) 0;
in
{
  imports = [
    ../wireguard/home.nix
  ];

  services.prometheus.exporters.node = {
    enable = true;
    listenAddress = vpnAddress;
    enabledCollectors = [ "systemd " ];
  };

  systemd.services.prometheus-node-exporter.after = [ "wireguard-wg-home.service" ];
}