Forward line and file information from event metadata into opentelemetry events

[djc]

Feature Request

As far as I can tell, the tracing-opentelemetry code currently does not use the file() and line() elements of event metadata when creating an opentelemetry event. These would be nice to have in addition to the target.

Crates

tracing-opentelemetry

Motivation

More accurate information will make it easier to pinpoint issues.

Proposal

The event attributes could carry "file" and "line" attributes if the metadata yields Some for the relevant methods.

cc @jtescher

[jtescher]

This sounds like a good addition! 👍