Android has a native way to see a log of the notifications you receive, but it's quite hidden from most eyes. To access it, you need to add a widget, choose Settings among the list of widgets, and then Notification log. It helps you see a notification you may have dismissed by mistake and, more recently, I've used it to figure out which notification channel something was coming from after dismissing it and thinking that I don't need that particular type of notification or I want to lower its priority.

But if you don't want to mess with the notification log, there's an app you can install to bring back the last dismissed notification, kind of like an undo button, and it's simply called Unnotification.

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