os/modules/monitoring-server/default.nix

{
  lib,
  config,
  pkgs,
  ...
}:
with lib; let
  psCfg = config.pub-solar;
  cfg = config.pub-solar.monitoring-server;
in {
  options.pub-solar.monitoring-server = {
    enable = mkEnableOption "Install a monitoring server node";
    listenAddress = mkOption {
      type = types.str;
      default = "127.0.0.1";
    };
    grafana = {
      enable = mkEnableOption "Run grafana";
      port = mkOption {
        type = types.int;
        default = 2342;
      };
    };
    node_exporter = {
      enable = mkEnableOption "prometheus node-exporter support";
      hosts = mkOption {
        type = types.listOf types.str;
      };
    };
    snmp = {
      enable = mkEnableOption "prometheus snmp export support";
      hosts = mkOption {
        #type = types.Or (types.AttrSet types.listOf types.str);
      };
      settings = mkOption {
        type = types.NullOr types.AttrSet;
        default = null;
      };
    };
    smokeping = {
      enable = mkEnableOption "prometheus smokeping support";
      hosts = mkOption {
        type = types.listOf types.str;
      };
    };
  };

  config = mkIf cfg.enable {
    networking.firewall.allowedTCPPorts = [cfg.grafana.port 9001 9374];

    pub-solar.monitoring-client = {
      enable = true;
      listenAddress = cfg.listenAddress;
    };

    services.grafana = mkIf cfg.grafana.enable {
      enable = true;
      settings = {
        server = {
          http_addr = cfg.listenAddress;
          http_port = cfg.grafana.port;
        };
      };
    };

    services.prometheus = {
      enable = true;
      listenAddress = cfg.listenAddress;
      port = 9001;
      scrapeConfigs = [
        {
          job_name = "node_exporters";
          static_configs = [
            {
              targets =
                ["${cfg.listenAddress}:9002"]
                ++ cfg.node_exporter.hosts;
            }
          ];
        }
        {
          job_name = "snmp_wohnung_aachen_mikrotik";
          scrape_interval = "15s";
          static_configs = [
            {
              targets = cfg.snmp.hosts;
            }
          ];
          metrics_path = "/snmp";
          params = {
            auth = ["public_v2"];
            module = ["if_mib"];
          };
          relabel_configs = [
            {
              source_labels = ["__address__"];
              target_label = "__param_target";
            }
            {
              source_labels = ["__param_target"];
              target_label = "instance";
            }
            {
              target_label = "__address__";
              replacement = "10.0.1.254:9116";
            }
          ];
        }
        {
          job_name = "smokeping";
          scrape_interval = "15s";
          static_configs = [
            {
              targets = [
                "${cfg.listenAddress}:9374"
              ];
            }
          ];
        }
      ];

      exporters.smokeping = mkIf cfg.smokeping.enable {
        enable = true;
        listenAddress = cfg.listenAddress;
        hosts = cfg.smokeping.hosts;
      };
    };
  };
}