As a Site Owner, you can monitor information about the apps for SharePoint that have been added to a site. For example, you can view information about how often an app has been installed, how many errors an app has had, or how often it has been used.
Monitor apps for a site
Click Settings and then click Site Contents.
On the Site Contents page, find the app you want to view information, and click the ellipses (...)
In the apps dialog, click Details. If you don't see Details, then click the ellipses (...) again, and then click Details.
On the App Details page, you can view information about licenses, errors, installs and usage.
Note: Many of SharePoint's built in apps don't offer Details.
If you can view details, do any of the following:
To do this:
View more information about errors
Click the number that appears after the different types of errors to view error details.
View usage information for a specific timeframe
Click Days, Months, or Years to change the timeframe for the usage information data that displays in the graph.
Note: If the app uses connections to external data through Business Connectivity Services (BCS), there will also be a graph that displays the number of calls that the app made to external data sources. The dates that appear in the Usage and BCS Calls graphs are displayed in Coordinated Universal Time (UTC).