mholt/caddy-l4

Metrics support

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#372 opened on Jan 21, 2026

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enhancementhelp wanted

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Description

Are there any plans to add metrics support similar to what's in caddy http app (request size, response size, ip, etc...)? It seems some of the data is already here: https://github.com/mholt/caddy-l4/blob/93f52b6a03bac66a4321dd1c5287820e3c2a832c/layer4/server.go#L199-L204 they are also not public so using them in a module to handle metrics is not currently feasible.

Thanks.

Contributor guide

Research direction
Examine the existing code references in server.go to understand the data available and study how Caddy HTTP app implements metrics (likely using Prometheus). Then design a metrics module for caddy l4.
Tech stack
go
Domain
infrastructurenetworking
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
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
GoCaddy
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60