After you distribute through the App Store, you can select the category of metric reports Apple collects for you in the organizer.
Choose Window > Organizer, then click Metrics.
If no metrics categories appear, go to If no crash, energy, or metrics reports appear in the organizer.
In the left column, select an app you uploaded to App Store Connect.
If you belong to multiple teams, the list includes all apps uploaded by your teams.
In the second column, choose the category of metrics for which to display reports in the detail area. The reports include:
Battery: How the app uses battery power.
Launch Time: The launch time of the app.
Hang Rate: The responsiveness of the app to user interaction.
Memory: Measurements of memory use by the app.
Disk Writes: How the app uses long term storage.
The reports appear in the detail area.
Use the device selection drop down menu to display the data for a device or device category. Click the menu and choose either a specific device, or a category of device. Selecting the iPhone (All) or iPad (All) displays data for all of the devices of that type.
Use the displayed data selection drop down menu to display the typical data or to display the data with the largest or smallest values.
The typical data is the median of all the collected data, also called the 50th percentile. The 90th percentile represents the highest or lowest numbers depending on the metric.