User activity over time shows the number of people who used your app in the past 30 days, 7 days, and 1 day. You can use the card to see changes in activity over a shorter timeframe compared to changes over a broader timeframe. The card includes only users who engaged with your website while the site was in focus or your app while the app was in the foreground.
For example, in the following chart, you would have 72K users in the past 30 days and 3.5K users in the past 1 day. If the number of users in the past 1 day were to begin to trend downwards, you could expect to see fewer users over the past 7 and 30 days in the near future.