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54 lines
2.2 KiB
Markdown
54 lines
2.2 KiB
Markdown
# Production Metrics
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vLLM exposes a number of metrics that can be used to monitor the health of the
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system. These metrics are exposed via the `/metrics` endpoint on the vLLM
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OpenAI compatible API server.
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You can start the server using Python, or using [Docker][deployment-docker]:
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```console
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vllm serve unsloth/Llama-3.2-1B-Instruct
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```
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Then query the endpoint to get the latest metrics from the server:
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```console
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$ curl http://0.0.0.0:8000/metrics
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# HELP vllm:iteration_tokens_total Histogram of number of tokens per engine_step.
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# TYPE vllm:iteration_tokens_total histogram
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vllm:iteration_tokens_total_sum{model_name="unsloth/Llama-3.2-1B-Instruct"} 0.0
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vllm:iteration_tokens_total_bucket{le="1.0",model_name="unsloth/Llama-3.2-1B-Instruct"} 3.0
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vllm:iteration_tokens_total_bucket{le="8.0",model_name="unsloth/Llama-3.2-1B-Instruct"} 3.0
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vllm:iteration_tokens_total_bucket{le="16.0",model_name="unsloth/Llama-3.2-1B-Instruct"} 3.0
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vllm:iteration_tokens_total_bucket{le="32.0",model_name="unsloth/Llama-3.2-1B-Instruct"} 3.0
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vllm:iteration_tokens_total_bucket{le="64.0",model_name="unsloth/Llama-3.2-1B-Instruct"} 3.0
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vllm:iteration_tokens_total_bucket{le="128.0",model_name="unsloth/Llama-3.2-1B-Instruct"} 3.0
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vllm:iteration_tokens_total_bucket{le="256.0",model_name="unsloth/Llama-3.2-1B-Instruct"} 3.0
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vllm:iteration_tokens_total_bucket{le="512.0",model_name="unsloth/Llama-3.2-1B-Instruct"} 3.0
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...
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```
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The following metrics are exposed:
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```python
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--8<-- "vllm/engine/metrics.py:metrics-definitions"
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```
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The following metrics are deprecated and due to be removed in a future version:
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- `vllm:num_requests_swapped`, `vllm:cpu_cache_usage_perc`, and
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`vllm:cpu_prefix_cache_hit_rate` because KV cache offloading is not
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used in V1.
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- `vllm:gpu_prefix_cache_hit_rate` is replaced by queries+hits
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counters in V1.
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- `vllm:time_in_queue_requests` because it duplicates
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`vllm:request_queue_time_seconds`.
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- `vllm:model_forward_time_milliseconds` and
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`vllm:model_execute_time_milliseconds` because
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prefill/decode/inference time metrics should be used instead.
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Note: when metrics are deprecated in version `X.Y`, they are hidden in version `X.Y+1`
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but can be re-enabled using the `--show-hidden-metrics-for-version=X.Y` escape hatch,
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and are then removed in version `X.Y+2`.
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