anchor.diff:  
   * Provides simple metrics of accepted / dropped spans.
   
  -* If `spring-cloud-sleuth-zipkin` then the app will generate and collect Zipkin-compatible traces.
  +* If `spring-cloud-sleuth-zipkin2` then the app will generate and collect Zipkin-compatible traces.
   By default it sends them via HTTP to a Zipkin server on localhost (port 9411).
   Configure the location of the service using `spring.zipkin.baseUrl`.
  -
  -* If `spring-cloud-sleuth-stream` then the app will generate and collect traces via https://github.com/spring-cloud/spring-cloud-stream[Spring Cloud Stream].
  -Your app automatically becomes a producer of tracer messages that are sent over your broker of choice
  -(e.g. RabbitMQ, Apache Kafka, Redis).
  -
  -IMPORTANT: If using Zipkin or Stream, configure the percentage of spans exported using `spring.sleuth.sampler.percentage`
  +  - If you depend on `spring-rabbit` or `spring-kafka` your app will send traces to a broker instead of http.
  +  - Note: `spring-cloud-sleuth-stream` is deprecated and should no longer be used.
  +
  +IMPORTANT: If using Zipkin, configure the percentage of spans exported using `spring.sleuth.sampler.percentage`
   (default 0.1, i.e. 10%). *Otherwise you might think that Sleuth is not working cause it's omitting some spans.*
   
   NOTE: the SLF4J MDC is always set and logback users will immediately see the trace and span ids in logs per the example
  
positive.code: 
  ==== Sleuth with Zipkin via HTTP
  
  If you want both Sleuth and Zipkin just add the `spring-cloud-starter-zipkin` dependency.
  
  [source,xml,indent=0,subs="verbatim,attributes",role="primary"]
  .Maven
  
negative.code: }
  
  dependencies {
      compile "org.springframework.cloud:spring-cloud-starter-sleuth-zipkin2" <2>
      compile "org.springframework.amqp:spring-rabbit" <3>
  }
  ----
  <1> In order not to pick versions by yourself it's much better if you add the dependency management via
  the Spring BOM
  <2> Add the dependency to `spring-cloud-starter-sleuth-zipkin2` - that way all dependent dependencies will be downloaded
  <3> To automatically configure rabbit, simply add the spring-rabbit dependency
  
  == Additional resources
  
  