Spring cloud sleuth example

This example demonstrates the following features

Programatically create spans
set sampling rate
Zipkin via HTTP
RestTemplate integration
Creating a custom filter that adds tags to the current span

Start up all modules using

   mvn spring-boot:run

then hit

http://localhost:8080/1007?port=8090

to call service a so it will call service b

then open

http://localhost:9090/

and look for the trace of the call