Spring Webflux Auto Instrumentation with additional tags

[algirdelizzz]

Hello,

I'm running a Spring Boot application along side the java-agent, it all works fine, but let's say I want to add some additional custom tags to the spans created by the io.opentelemetry.spring-webflux-5.0 library, what would be the correct approach of doing this? In manual mode, I guess it would be adding an additional attribute extractor in SpringWebfluxTelemetryBuilder.

[mateuszrzeszutek]

Hey @algirdelizzz ,

That depends whether you want to add attributes to the SERVER spans (incoming requests) or CLIENT spans (requests sent by your application).

• SERVER spans: the simplest way to do that would be to call Span.current() and set whatever attributes you want somewhere in your handler functions.
• CLIENT spans: you'd have to build a SpringWebfluxTelemetry instance and install it yourself; passing a custom AttributesExtractor to the builder. The agent will back off and use your own manually installed instrumentation then.