By default, Tasker is run as a foreground app, even when it is in the background. This is to increase reliability. Android
requires that apps running constantly in the foreground display a notification.
If it bothers you, there are a couple of things you can do:
- On Android 6+, you can hide the notification. How you do this depends on your phone and Android version. You should be able to find instructions on the web.
- You could also disable the Run in Foreground option in the Tasker settings. Be aware that this may reduce reliability.