Not all traces are starting from faro browser instrumentation

[prajon84]

I have implemented faro browser instrumentation on my front end app.
front end app connects to the backend api and all.

As per my understanding, all the traces should be starting from the browser tracing.

However, I always have traces that do not start from browser side.

Can it be issue related to faro configuration, sampling, or implementation ?

[cedricziel]

Can you provide an example for this behavior?

With tracing, only requests that originate from xhr and fetch APIs will have a mapped frontend span; initial loads cannot cause a root-span.

[prajon84]

Yeah, I have sth like this:
where the left side trace is not starting from browser but after the app which the browser hits.
But, the right side trace is correctly starting from the browser and then the app: