https://www.zabbix.com/documentation/2.2/manual/web_interface/frontend_sections/administration/general says "The watchdog will send notifications to the user group set here if the database is down" but it is not completely clear whether all media will be used.

it should be clarified whether all media entries of all media types will be used here.

additionally, it might be worth rewriting "will alarm Zabbix administrators in case of disaster" to remove "Zabbix administrators" part - there is a user group and it is selected in this option by default, thus it is confusing to mention here.