fixes issue identified by derek (#83)

Fixes https://app.asana.com/0/1205229323407165/1206717151412873/f

examples/production_monitoring/README.md

@@ -21,13 +21,14 @@ Launch Prometheus and Grafana servers with `docker compose`:
 docker compose up
 ```
 
-Submit some sample requests to the server:
+Submit some sample requests to the server (after `pip install aiohttp`):
 ```bash
 wget https://huggingface.co/datasets/anon8231489123/ShareGPT_Vicuna_unfiltered/resolve/main/ShareGPT_V3_unfiltered_cleaned_split.json
 
 python3 ../../benchmarks/benchmark_serving.py \
     --model mistralai/Mistral-7B-v0.1 \
     --tokenizer mistralai/Mistral-7B-v0.1 \
+    --backend openai \
     --endpoint /v1/completions \
     --dataset ShareGPT_V3_unfiltered_cleaned_split.json \
     --request-rate 3.0