nixos-config/common/metrics-exporters.nix

{ config, pkgs, values, ... }:
let
  metricsHost = "192.168.10.175"; # defiant.home.feal.no
in {
  services.prometheus.exporters.node = {
    enable = true;
    port = 9100;
    enabledCollectors = [ "systemd" ];
  };

  networking.firewall = {
    # TODO: Move this into the node-exporter systemd service
    allowedTCPPorts = [ 9100 ];
    extraCommands = ''
      iptables -A INPUT -p tcp -m tcp --source ${metricsHost}/32 --dport 9100 -j ACCEPT
      iptables -A INPUT -p tcp -m tcp --dport 9100 -j DROP
    '';
  };

  services.promtail = {
    enable = true;
    configuration = {
      server = {
        http_listen_port = 28183;
        grpc_listen_port = 0;
      };
      clients = [
        {
          url = "http://${metricsHost}:3100/loki/api/v1/push";
        }
      ];
      scrape_configs = [
        {
          job_name = "systemd-journal";
          journal = {
            max_age = "12h";
            labels = {
              job = "systemd-journal";
              host = config.networking.hostName;
            };
          };
          relabel_configs = [
            {
              source_labels = [ "__journal__systemd_unit" ];
              target_label = "unit";
            }
            {
              source_labels = [ "__journal_priority_keyword" ];
              target_label = "level";
            }
          ];
        }
      ];
    };
  };

}