sgl-project/sglang

[Feature] Add KV cache usage prometheus metrics

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#5,979 opened on May 2, 2025

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good first issue

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Description

Motivation

It would be great to track prometheus metrics for KV cache utilization.

Related resources

vLLM already offers KV cache utilization prometheus metrics, see here, at vllm:gpu_cache_usage_perc.

Contributor guide

Research direction
Study vLLM's KV cache metrics implementation and adapt it to SGLang's metrics system.
Tech stack
python
Domain
backendobservability
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75