School Stream provides you with useful data relating to app views. There are two ways to access this data:
General App Analytics
This can be found under the 'School Stream' menu at the top of the dashboard, under 'Stats'. Here you will see a range of useful information, such as average user activity and recent notices.
Notice Specific Analytics
This can be accessed when in the edit screen for the notice itself. Look for the 'View Activity' button on the right side of the page. This shows who has viewed the notice recently.