{ config, pkgs, ... }:

{
  environment.systemPackages = [
    pkgs.prometheus-snmp-exporter
  ];

  systemd.services.prometheus-snmp-exporter = {
    enable = true;
    description = "Gather data from SNMP devices and expose them as Prometheus metrics";
    unitConfig = {
      Type = "simple";
    };
    serviceConfig = {
      ExecStart = "${pkgs.prometheus-snmp-exporter}/bin/snmp_exporter --config.file='/tank/services/metrics/prometheus/snmp.yml'";
      # snmp.yml = https://github.com/prometheus/snmp_exporter/blob/main/snmp.yml + https://global.download.synology.com/download/Document/Software/DeveloperGuide/Firmware/DSM/All/enu/Synology_DiskStation_MIB_Guide.pdf
    };
    wantedBy = [ "multi-user.target" ];
  };
}