Hello,
Check out this article.
https://nagiosenterprises.my.site.com/s ... I-dea54a4a
Also, I seen this message elsewhere on the internet.
" How Scheduled Downtime Affects Notifications
When a host or service is in a period of scheduled downtime, Nagios will not allow normal notifications to be sent out for the host or service. However, a "DOWNTIMESTART" notification will get sent out for the host or service, which will serve to put any admins on notice that they won't receive upcoming problem alerts.
When the scheduled downtime is over, Nagios will allow normal notifications to be sent out for the host or service again. A "DOWNTIMEEND" notification will get sent out notifying admins that the scheduled downtime is over, and they will start receiving normal alerts again.
If the scheduled downtime is cancelled prematurely (before it expires), a "DOWNTIMECANCELLED" notification will get sent out to the appropriate admins. "
https://assets.nagios.com/downloads/nag ... ntime.html
May be a default setting.
Hope that helps!