This small thread accumulates some how to guides which gather around the topic off notifications in the director.
Title Notification setup guide director
The first guide is from an older thread which you can find language (English) here
Title Icinga 2, Icinga Director and Notifications
The second guide is a guide written by Marianne Spiller (English) here
Title Icinga 2 + Director + Notifications = <3
The guide from above is also available in (German) here
Title Setup Email Notification through Icinga Director
The third guide is also from an older written thread [here] (https://monitoring-portal.org/woltlab/index.php?thread/42257-setup-email-notification-through-icinga-director/)
If you like those guides or feel like they are outdated and you want to contribute to those guides with your own. Please feel free to add your own written guide on how to handle notifications with the director in written form or even as a visual guide screencast.