Adding distributed tracing to the source code

In this section, we will learn how to update the source code to enable distributed tracing using Spring Cloud Sleuth and Zipkin. This can be done through the following steps:

1. Add dependencies to the build files to bring in Spring Cloud Sleuth and the capability of sending trace information to Zipkin.
2. Add dependencies to RabbitMQ and Kafka for the projects that haven't used them before, that is, the Spring Cloud projects authorization-server, eureka-server, and gateway.
3. Configure the microservices to send trace information to Zipkin using either RabbitMQ or Kafka.
4. Add a Zipkin server to the Docker compose files.
5. Add the kafka Spring profile in docker-compose-kafka.yml to the Spring Cloud projects authorization-server, eureka-server, and gateway.

Adding the Zipkin server...