title: Spring boot sleuth no traces in zipkin
body: <p>we are trying to use sleuth to send logs to zipkin. We are using spring boot '2.2.6.RELEASE' and cloud version Hoxton.RELEASE. I have added below dependencies</p>
  <pre><code>implementation &quot;org.springframework.cloud:spring-cloud-starter-zipkin:2.2.6.RELEASE&quot;
  implementation &quot;org.springframework.cloud:spring-cloud-starter-sleuth:2.2.6.RELEASE&quot;
  implementation &quot;org.springframework.cloud:spring-cloud-sleuth-zipkin:2.2.6.RELEASE&quot;
  </code></pre>
  <p>And added below props in logback.xml
  <strong>[%X{traceId} %X{spanId} %X{X-Span-Export}]</strong></p>
  <p>With the above changes in our 2 services, we were expecting zipkin will have some logs, but nothing appeared. So then we tried to add below properties in application.properties</p>
  <pre><code>spring.zipkin.base-url=http://localhost:9411
  spring.zipkin.enabled=true
  spring.zipkin.service.name=xyz-service
  spring.sleuth.enabled=true
  spring.sleuth.integration.enabled=true
  spring.sleuth.sampler.rate=100
  spring.sleuth.sampler.probability=1.0
  spring.zipkin.sender.type=web
  </code></pre>
  <p>And still dont see logs / service name in zipkin.
  Can you see what am I doing wrong here. Out apps have cloud-stream dependencies as well. And also noted that in logs I am getting X-span-export coming as false. For ex: <strong>[3e205e41db60212f 77a405a53d62c9fa false]</strong></p>