Chapter 13. Observability: Monitoring, Logging, and Tracing
You have learned that testing is a vital skill to be mastered for the effective implementation of continuous delivery, but equally import is observability. Testing enables verification and promotes understanding at build and integration time, whereas observability allows verification and enables debugging at runtime. In this chapter, you will examine what you should observe and how, and you will learn about the implementation of monitoring, logging, tracing, and exception tracking. You will also explore several best practices for each of these implementations, and learn how to combine them with visualization to not only increase your understanding of your running systems, but also identify how to close the feedback loop and continuously enhance your applications.
Observability and Continuous Delivery
Continuous delivery does not end with the application being deployed into production. In fact, you could argue that deploying your application is really the beginning and that the process of continuous delivery stops only when an application or service is retired or decommissioned. Throughout the lifetime of an application, it is vital that you are able to understand what is occurring, and what has occurred, within the system. This is what observability is all about.
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