fix: needed to open teh ports to be able to get the data

applications/prometheus.nix

@@ -51,6 +51,9 @@ in {
         enabledCollectors = ["systemd"];
         port = cfg.port_collecter;
       };
+
+      # make sure the port is open
+      networking.firewall.allowedTCPPorts = [cfg.port_collecter];
     }
     (mkIf cfg.server.enable {
       services.prometheus = {