Managing Notification Tags
When you create a target address, either you associate a list of
notification tags with the target or by default, the defaultNotify tag is associated with
the target. When the system generates notifications, only those targets associated with tags
currently in the standard MIB table, called snmpNotifyTable, are notified.

Note
This notification entry can be deleted via CLI and also via MIB. If this is deleted, then this can result in the traps not being sent for trap receivers which do not have the tag-list value mentioned explicitly.