Add worker name + nix

nix/modules/default/gw-sharding.nix

@@ -39,6 +39,7 @@ in
                 # things we set by default...
                 EVENT_TRANSMISSION = "unix";
                 EVENT_SOCKET_PATH = "/run/spacebar/";
+                WORKER_NAME = "sb-gateway-${port}";
               }
               // cfg.extraEnvironment
               // {

src/gateway/opcodes/Identify.ts

@@ -67,7 +67,7 @@ import { check } from "./instanceOf";
 export async function onIdentify(this: WebSocket, data: Payload) {
     const totalSw = Stopwatch.startNew();
     const taskSw = Stopwatch.startNew();
-    const gatewayShardName = `sb-gateway`;
+    const gatewayShardName = process.env.WORKER_NAME ?? `sb-gateway`;
 
     if (this.user_id) {
         // we've already identified