move node_exporter to its own module

modules/services/default.nix

@@ -7,6 +7,7 @@
   imports = [
     ./deployerbot
     ./friendlyport
+    ./node_exporter
     ./nsd-acme
     ./postfix
     ./syncthing

modules/services/node_exporter/default.nix

@@ -0,0 +1,22 @@
+{
+  config,
+  lib,
+  myData,
+  ...
+}: {
+  options.mj.services.node_exporter = with lib.types; {
+    enable = lib.mkEnableOption "Enable node_exporter";
+  };
+
+  config = lib.mkIf config.mj.services.node_exporter.enable {
+    services.prometheus.exporters.node = {
+      enable = true;
+      enabledCollectors = ["systemd" "processes"];
+      port = myData.ports.exporters.node;
+    };
+
+    mj.services.friendlyport.vpn.ports = [
+      myData.ports.exporters.node
+    ];
+  };
+}