anchor.diff:  [source,java]
   ----
   Span initialSpan = this.tracer.nextSpan().name("span").start();
  -try (Tracer.SpanInScope ws = this.tracer.withSpanInScope(initialSpan)) {
  -    ExtraFieldPropagation.set("foo", "bar");
  -    ExtraFieldPropagation.set("UPPER_CASE", "someValue");
  +ExtraFieldPropagation.set(initialSpan.context(), "foo", "bar");
  +ExtraFieldPropagation.set(initialSpan.context(),"UPPER_CASE", "someValue");
   }
   ----
   
  
positive.code: If you want to use RabbitMQ or Kafka instead of HTTP, add the `spring-rabbit` or `spring-kafka` dependency.
  The default destination name is `zipkin`.
  
  CAUTION: `spring-cloud-sleuth-stream` is deprecated and incompatible with these destinations.
  
  If you want Sleuth over RabbitMQ, add the `spring-cloud-starter-zipkin` and `spring-rabbit`
  
negative.code: * If `spring-cloud-sleuth-zipkin` is on the classpath, the app generates and collects Zipkin-compatible traces.
  By default, it sends them over HTTP to a Zipkin server on localhost (port 9411).
  You can configure the location of the service by setting `spring.zipkin.baseUrl`.
  ** If you depend on `spring-rabbit`, your app sends traces to a RabbitMQ broker instead of HTTP.
  ** If you depend on `spring-kafka`, and set `spring.zipkin.sender.type: kafka`, your app sends traces to a Kafka broker instead of HTTP.
  
  CAUTION: `spring-cloud-sleuth-stream` is deprecated and should no longer be used.
  
  