Hi Henry.

Yes, you’re right CLS may loose the context if some libraries/middlewares on the async call chain doesn’t play nice with Async Hooks API. However, it’s not very common and there shouldn’t be any problems libraries/middlewares built on top of standard APIs.

Thanks for sharing your experience. Could you point me at any known issues on GitHub or somewhere else that you have experienced?

Anyway, in order to mitigate most obvious problems, there are some recommendations in the cls-tracer's readme. But I strongly advice to test apps thoroughfully in order to make sure that everything works as expected.