Measure and Learn

As mentioned in Chapter 1, it is important from the very start of a project to consider things like how your application is going to be monitored in test and production, and what telemetry will be needed to understand how your users are using your application.

Getting feedback and metrics from your applications in production allows you to gain insights that will help you to not just detect and diagnose issues, but, if done right, prioritize your future investments. Doing things like A/B testing where you deploy a new feature to, say, half of your users and then measure in what degree the new feature is being used ...

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