Alert
One thing that we have been using in our GSGs for a long time is the alert system. We first introduced it in the Revolutions DLC for the original Victoria almost twenty years ago. In EU4 we had 3 different colored alerts, but here we have added 3 new colors.

The orange alert is between the yellow and red in danger.
The blue alert, which is for pure UI hints, like a tutorial notification, or not having a control group.
The purple alert for situations and disasters.

You can always discard an alert if you think it's noisy, and it will only appear again if the conditions change.