Monitoring vLLM in Production: Metrics, PromQL, Alerts, and Runbooks

Published: 2026-01-28 Updated: 2026-06-18 Version scope: This guide targets vLLM 0.23.x and its default V1 engine. Metric names and semantics change between releases, so verify the /metrics output of the exact version and serving configuration you run before copying queries or alerts into production. A vLLM server can pass Kubernetes health checks while users experience slow or unstable responses.…