Using Fire TV analytics you can find relevant information about your Fire TV app's performance!
Login to the Amazon Developer Account
After arriving at the Dashboard, click Reporting on the top menu bar
Most information you will need can be found under Overview
On this window, you will see data regarding App Sales and Subscription Sales. As our apps are free to download, "App Sales" will mean "unique first-time downloads". This is further expanded in the Units tab on the left-hand menu
More information regarding this information and how to export and read it more in-depth can be found on Amazon's developer support page: https://developer.amazon.com/docs/reports-promo/sales-reports.html