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implement prometheus fast-api-instrumentor for http service metrics #15657

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Merged
merged 1 commit into from
Mar 29, 2025
Merged

implement prometheus fast-api-instrumentor for http service metrics #15657

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11 changes: 11 additions & 0 deletions vllm/entrypoints/openai/api_server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -311,13 +311,24 @@ def mount_metrics(app: FastAPI):
# See https://prometheus.github.io/client_python/multiprocess/
from prometheus_client import (CollectorRegistry, make_asgi_app,
multiprocess)
from prometheus_fastapi_instrumentator import Instrumentator

prometheus_multiproc_dir_path = os.getenv("PROMETHEUS_MULTIPROC_DIR", None)
if prometheus_multiproc_dir_path is not None:
logger.debug("vLLM to use %s as PROMETHEUS_MULTIPROC_DIR",
prometheus_multiproc_dir_path)
registry = CollectorRegistry()
multiprocess.MultiProcessCollector(registry)
Instrumentator(
excluded_handlers=[
"/metrics",
"/health",
"/load",
"/ping",
"/version",
],
registry=registry,
).add().instrument(app).expose(app)

# Add prometheus asgi middleware to route /metrics requests
metrics_route = Mount("/metrics", make_asgi_app(registry=registry))
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