otel-fiber-example.txt

context = Context.current

Fiber.new {
  Context.with_context(context) do
     # your fiber code
     OpenTelemetry::Trace.current_span.finish
  end
}

Thread -> 
  main fiber local [->__opentelemetry_context_storage__] = [Root Context]
  tracer.in_span("POST /graphql") => local [->__opentelemetry_context_storage__] = [Root Context][ Context[current_span] = "POST /graphql" ] {
    graphql Dataloader
     fiber_locals = [->__opentelemetry_context_storage__] = [Parent Context][Root Context][ Context[current_span] = "POST /graphql" 

    Fiber.new {
      fiber_locals = [->__opentelemetry_context_storage__] = [Parent Context][Root Context][ Context[current_span] = "POST /graphql" 

       OpenTelemetry::Trace.current_span = ?? << Context[current_span] = Span<"POST /graphql">
       tracer.in_span("operation a") {
          fiber_locals = [->__opentelemetry_context_storage__] = [Parent Context][Root Context][ Context[current_span] = "POST /graphql"] [Context [current_span] = "operation a" ]      
       }
       fiber_locals = [->__opentelemetry_context_storage__] = [Parent Context][Root Context][ Context[current_span] = "POST /graphql" 

       
    }
    
   }
   
   https://github.com/rmosolgo/graphql-ruby/blob/6803897ae8e07b08c9936596478e895e92a3125a/lib/graphql/dataloader.rb#L288