I have a small reference implementation that I use when talking about Distributed Tracing. I recently updated the repo to use SigNoz instead of Jaeger. I'd be super-appreciative for anyone to clone the repo and test the README. HTH!
https://github.com/dougramirez/otel-distributed-tracing
SigNoz is an open-source APM. It helps developers monitor their applications & troubleshoot problems, an open-source alternative to DataDog, NewRelic, etc.