Users see the message "No Data Available" for Application Visibility under Security Director > Monitor > Applications.
AppTrack Events can be seen under "Security Director > Monitor > Events & Logs > Apptrack" in the same time span selected for Application Visibility.
SRX device has Apptrack configuration and It is sending this event logs to Security Director insights.
The issue could be seen if the Application Visibility polling is disabled. To resolve, deselect the check box option for "Stop Polling":