Throughout this book, we have covered everything about Reactivity in Spring 5. This includes the concepts and patterns of reactive programming with Reactor 3, the new features of Spring Boot 2, Spring WebFlux, Reactive Spring Data, Spring Cloud Streams, and testing techniques for reactive programming. Now that we are familiar with these concepts, it is time to prepare our reactive application for production. The application should expose logs, metrics, traces, feature toggles, and other information that is useful for ensuring a successful operation. The application should also discover runtime dependencies such as database or message broker without violating security concerns. With all of this in mind, we can build an executable artifact ready for an on-premise or cloud deployment.

In this chapter, we will cover the following topics:

• The challenges of a software operation
• The need for operational metrics
• The aim and features of a Spring Boot Actuator
• How to extend Actuator capabilities
• Techniques and libraries for monitoring the reactive application
• Tracing services interaction inside the reactive system
• Tips and tricks for an application's deployment in the cloud