Add bird to monitoring

modules/monitoring/default.nix

@@ -21,6 +21,7 @@ in
         type = types.str;
         description = "Public Key of the monitoring wireguard interface of this host";
       };
+      bird = mkEnableOption "Monitor bird";
     };
   };
 
@@ -47,5 +48,11 @@ in
       openFirewall = true;
       firewallFilter = "-i wg-monitoring -p tcp -m tcp --dport 9100";
     };
+
+    services.prometheus.exporters.bird = mkIf cfg.bird {
+      enable = true;
+      openFirewall = true;
+      firewallFilter = "-i wg-monitoring -p tcp -m tcp --dport 9324";
+    };
   };
 }