Your app is your business, so keeping it healthy is important. Unfortunately, most of the tools available today are more like your doctor verifying the fact that you've had a heart attack—after it's happened. You can do better. In this session, you'll learn how to use metrics to be more proactive about monitoring your applications health, and to suss out the subtle but important warning signs that can help you prioritize developer time and improve the developer experience. We'll talk about how to instrument your code, what to measure, how to interpret the data, as well as how you can use the data to streamline your development process.