I tried to replicate this on Checkmk 2.2.0p17 Raw Edition and it does not work. I created a custom service attribute with ID “OPOMBA” and configured a rule to add it to 4 service checks. When I trigger the notification for one of these services, I cannot get this CSA into an email message. I tried including it in a subject as $OPOMBA$ and $SERVICE_OPOMBA$. I selected the option “Display additional information: Complete variable list (for testing)”. I even created a test notification script to output all environment variables to a text file. Nothing works, the attribute simply isn’t there. Can someone confirm this? Am I missing something?