modules/monitoring: add nixos-exporter

modules/monitoring/default.nix

@@ -76,5 +76,28 @@ in
               ip_protocol_fallback: false
       '';
     };
+
+    users.users."nixos-exporter" = {
+      isSystemUser = true;
+      group = "nixos-exporter";
+    };
+
+    users.groups."nixos-exporter" = {};
+
+    systemd.services."prometheus-nixos-exporter" = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      serviceConfig = {
+        Restart = "always";
+        PrivateTmp = true;
+        WorkingDirectory = "/tmp";
+        RuntimeDirectory = "prometheus-nixos-exporter";
+        User = "nixos-exporter";
+        Group = "nixos-exporter";
+        ExecStart = ''
+          ${pkgs.nixos-exporter}/bin/nixos-exporter
+        '';
+      };
+    };
   };
 }