"A simple user action might trigger a chain of downstream microservice calls. It would be tedious to trace the logs related to a particular user action across microservices. In addition to that, we might want to track down why a certain microservice call is taking so much time. We can use Spring Cloud Sleuth to handle these kinds of issues. Spring Cloud Sleuth provides the distributed tracing capabilities and we can also export these trace information to Zipkin to visualize the call traces. "
As a user I should be able to see my orders and can add more or reduce them from cart itself.