The checks were using an uncommon service description for their checks:
Notification Spooler [site] ...
Because those processes are logically tied to the OMD sites, it makes moresense to make them match the other OMD site check naming scheme:
OMD [site] Notification Spooler
This has now been changed. It will automatically be applied to new sites.Existing sites will only use this new description after enabling it viaGlobal Settings and performing a rediscovery of the services on the affectedhosts.