Metrics
You need to know what metrics are important and track them. For your mobile app, what are the key metrics that you are tracking?
The important metrics to track can vary depending on what type of app you have and the goals you have set. For mobile games short term retention and in-app purchases can be key metrics but may not apply to other app verticals.
Base your metrics around your goals. As you work to improve your metrics you will be getting closer to your goals as well.