Mobile users drive development teams to deliver new features and capabilities. Mobile performance management tools provide an essential feedback loop to guide the content of these updates. The collection of real-time data across technical-, engagement-, and business-aligned metrics helps companies better win, serve, and retain customers by gathering the information app developers need to gain insights into what's working and what's not. This report details a number of valuable metrics that teams commonly collect and describes the tools and frameworks that can help collect them. This is an update of a previously published report; Forrester reviews and updates it periodically for continued relevance and accuracy.