Add link after span creation when using propagation context

[enricoschaaf]

Hi 👋🏽

https://github.com/open-telemetry/opentelemetry-rust/pull/1515/files suggests this feature has been added.

https://github.com/open-telemetry/opentelemetry-specification/blob/main/spec-compliance-matrix.md suggests it has not been.

I tried to do it but I could not find a way to update span links for a trace in question is received via propagation context.

Is this possble?

[bantonsson]

Hi @enricoschaaf this should most definitely be possible. Could you please share some more information about what isn't working for you?

[enricoschaaf]

Well add_link is only available for Span. But as far as I know I cannot turn a propagation context into a tracing::Span.

[bantonsson]

The Span that is represented in the propagated context is the parent of the local Span, and not necessarily from this system, so you can't add information to it. You need to create a local Span that is a child of the propagated context, and add your links to that Span.