Qusetions about the tracing in netty server

[Roc-00]

After I read this (https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/instrumentation/netty/netty-4.1/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/netty/v4_1/server) I have a few questions.

• Is the first time to get the context is through extract the httprequest?like this:
  

• Can I do this to attach the server context?Not using the 'context.with(key, span)'.like this:
  

[mateuszrzeszutek]

Hey @Roc-00,
I'm not sure I understood your questions correctly. Do you want to instrument Netty server manually? Or do you want to extend the agent's default behavior?

[Roc-00]

yes,I am trying to instrument Netty server manually.Following the example of instrumentation, I used otle Java SDK to track the buried points of netty server.And I am not sure my understanding of instrumentation is correct.

[mateuszrzeszutek]

Okay, I understand - I'll try to answer your questions.
Regarding question 1: yes, in server instrumentations you usually (well, always) extract the context from the incoming HTTP message - some HTTP client might've propagated their trace/context using HTTP headers.
Regarding question 2: if you're using our AttributeKey<Context> SERVER_CONTEXT then it has to be Context - however as I understand it that attribute is needed by the agent to make several instrumentations work together nicely (e.g. server frameworks that internally use netty) - if you're instrumenting netty server manually then you might not need to set that one.

[Roc-00]

Thank you for your answear, I had already make it work.