OTel tracing support has been on my list for ages, ever since I started working on metrics in Caddy 
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The main reason I’ve put it off is due to the Otel Go module having API-breaking changes fairly often. They’re at 1.0-RC3 now, so things should be settling down, though I’m noting from the changelog that there are still breaking API changes.
If you’d like to start work on a PR to add tracing, that’d be great, however I’d like to hold off merging it until the OTel module is at 1.0 (which shouldn’t be too long now…).
And please add me as a reviewer on the PR - I’ve got lots of past experience instrumenting services with tracing 