fix: trace delayed websocket acknowledgements

loadtest/im-pressure/config.single-machine.example.json

@@ -10,10 +10,14 @@
     "a": ["wss://im-api.example.com/v0/channels"],
     "b": ["wss://im-api.example.com/v0/channels"]
   },
+  "dial_ips": {
+    "a": [],
+    "b": []
+  },
   "insecure_tls": false,
   "prepare_workers": 20,
   "connect_ramp": "30s",
-  "command_timeout": "20s",
+  "command_timeout": "90s",
   "ws_ping_interval": "20s",
   "preflight_workers": 32,
   "skip_p2p_preflight": false,
@@ -27,5 +31,7 @@
   "p2p_messages_per_user": 10,
   "p2p_interval": "1s",
   "drain_p2p": "30s",
-  "drain_group": "60s"
+  "drain_group": "60s",
+  "delivery_quiet_period": "10s",
+  "delivery_quiet_timeout": "3m"
 }