Within your google analytics account, you can unfold the left menu Behavior > Events > Overview.  

Next, click in the main pane Event Category ‘App Open’.  When the next screen loads, select Event Action ‘Push’.  The result will be a list of your push notifications sorted by popularity.  

If you want them sorted by date, you need to add the Secondary Dimension to the table ‘Date’ which will allow you then to sort them chronologically.

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