It's easy to see how your push notifications are doing.
1. Go to the Marketing Activities area.
2. Select your campaign.
3. Click View: Summary and select Dashboard.
4. You can view the Total Sent and Total Taps for iOS and Android in circle graphs. Scroll down to see Tap Decay in bar graphs.
The Sent metric may reflect more sends than the exact number of people to whom the the push notification was sent. That's because it's calculated based on the number of devices that qualify to receive your push. For example, if a single person has three devices, the dashboard registers three sends, not one.