[metrics] Gets Loki and Prometheus set up with Grafana

system/hosts/mcp/configuration.nix

@@ -103,6 +103,10 @@
         enable = true;
         enabledCollectors = [ "systemd" ];
         port = 9002;
+        # Open the firewall, but only listen on the internal address
+        # TODO: Add some form authentication
+        openFirewall = true;
+        listenAddress = "10.88.0.1";
       };
     };
   };