In the previous chapters, you learned about applying DevOps principles to software delivery. You learned how to create a pipeline from source control all the way to production. You also learned how to ensure that your delivery is compliant and secure, without sacrificing speed or a focus on the delivery of business value. In this chapter, you will learn how to start transforming this pipeline into a DevOps loop, a continuous process of delivering new software, and then measure how your application performs. This is a continuous journey, as you evaluate how your application fares in production and learn how to proceed next.

To do this, this chapter starts by introducing a means for gathering application crashes. Almost every application will, at some point, throw an unhandled exception and crash. Ensuring that application crashes are gathered and reported will enable you to investigate the causes and to address them. Next, attention shifts to instrumenting applications. Instrumentation is the practice of gathering logs and metrics that help you understand how your application performs in production. You can use them to get alerts when things go wrong or, hopefully, before they go wrong. The chapter concludes by exploring several options for integrating with other tools.

The following topics are covered in this chapter:

• Investigating application crashes
• Instrumenting web applications
• Integrating with other tools