Shows how to enable kafka

pom.xml

@@ -38,6 +38,11 @@
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-sleuth-zipkin</artifactId>
     </dependency>
+
+    <dependency>
+      <groupId>org.springframework.kafka</groupId>
+      <artifactId>spring-kafka</artifactId>
+    </dependency>
   </dependencies>
 
   <dependencyManagement>

src/main/resources/application.properties

@@ -1,6 +1,9 @@
 # spring.application.name and server.port are set in the main methods,
 # so not done here
 logging.level.org.springframework.web=DEBUG
+spring.zipkin.sender.type=kafka
+# for example, to use kafka from docker-machine
+spring.kafka.bootstrap-servers=192.168.99.100:9092
 spring.sleuth.traceId128=true
 spring.sleuth.sampler.probability=1.0
 # Adds trace and span IDs to logs (when a trace is in progress)