When you know that the activities of an execution schedule will cause alerts that you do not need to take action on, you can use maintenance to suppress alerts, saving you the time and effort of clearing them later.
Setting maintenance to Planned indicates you are expecting downtime during the time period. As a result, during Planned maintenance, the downtime of the affected devices, sites, and network services does not appear as downtime on reports.
Maintenance cannot be associated with tasks that recur more often than once a day or are triggered by computer startup.
The minimum duration is .5 hour. In the Duration box, any fraction of an hour less than .5 hour is rounded up to .5 hour. Over .5 hour, numbers are rounded to one decimal place.
In Service Center, click Configuration > Schedules > Execution.
Click the name of an execution schedule.
In the Schedule column, click the link to a task schedule.
Select the Apply Maintenance to Schedule check box.
In the Alert Suppression area, select the check boxes of the alerts to suppress.
In the Duration box, type a number or use the up and down arrow buttons to raise or lower the duration in half hour increments.
Click Save.