Refactor Prometheus and Add Request Level Metrics (vllm-project#2316)

examples/production_monitoring/README.md

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+# vLLM + Prometheus/Grafana 
+
+This is a simple example that shows you how to connect vLLM metric logging to the Prometheus/Grafana stack. For this example, we launch Prometheus and Grafana via Docker. You can checkout other methods through [Prometheus](https://prometheus.io/) and [Grafana](https://grafana.com/) websites. 
+
+Install: 
+- [`docker`](https://docs.docker.com/engine/install/)
+- [`docker compose`](https://docs.docker.com/compose/install/linux/#install-using-the-repository)
+
+### Launch
+
+Prometheus metric logging is enabled by default in the OpenAI-compatible server. Launch via the entrypoint:
+```bash
+python3 -m vllm.entrypoints.openai.api_server \
+    --model mistralai/Mistral-7B-v0.1 \
+    --max-model-len 2048 \
+    --disable-log-requests
+```
+
+Launch Prometheus and Grafana servers with `docker compose`:
+```bash
+docker compose up
+```
+
+Submit some sample requests to the server:
+```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 \
+    --endpoint /v1/completions \
+    --dataset ShareGPT_V3_unfiltered_cleaned_split.json \
+    --request-rate 3.0
+```
+
+Navigating to [`http://localhost:8000/metrics`](http://localhost:8000/metrics) will show the raw Prometheus metrics being exposed by vLLM.
+
+### Grafana Dashboard
+
+Navigate to [`http://localhost:3000`](http://localhost:3000). Log in with the default username (`admin`) and password (`admin`).
+
+#### Add Prometheus Data Source
+
+Navigate to [`http://localhost:3000/connections/datasources/new`](http://localhost:3000/connections/datasources/new) and select Prometheus. 
+
+On Prometheus configuration page, we need to add the `Prometheus Server URL` in `Connection`. For this setup, Grafana and Prometheus are running in separate containers, but Docker creates DNS name for each containers. You can just use `http://prometheus:9090`.
+
+Click `Save & Test`. You should get a green check saying "Successfully queried the Prometheus API.".
+
+#### Import Dashboard 
+
+Navigate to [`http://localhost:3000/dashboard/import`](http://localhost:3000/dashboard/import), upload `grafana.json`, and select the `prometheus` datasource. You should see a screen that looks like the following:
+
+![Grafana Dashboard Image](https://i.imgur.com/R2vH9VW.png)

examples/production_monitoring/docker-compose.yaml

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+# docker-compose.yaml
+version: "3"
+
+services:
+  prometheus:
+    image: prom/prometheus:latest
+    extra_hosts:
+      - "host.docker.internal:host-gateway"     # allow a direct connection from container to the local machine
+    ports:
+      - "9090:9090"   # the default port used by Prometheus
+    volumes:
+      - ${PWD}/prometheus.yaml:/etc/prometheus/prometheus.yml # mount Prometheus config file
+
+  grafana:
+    image: grafana/grafana:latest
+    depends_on:
+      - prometheus
+    ports:
+      - "3000:3000" # the default port used by Grafana