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This tab allows you to specify alerts to only trigger for certain rules and for certain specified time-frames.the timeframes for applying the event alert rule. 

(Screenshot)

Available actions

Select alert rule timeframe

Allows you to select the condition under which the alert should trigger. For example, you can specify that the alert rule looks for security changes performed by privileged users, or only alerts on events that are successful.a specific timeframe for applying the event alert rules. Select the Keep the rule active at all times option is to apply the event alert rule at all times or select the Keep the rule active only within a timeframe option and specify a timeframe for the alert rule to be enabled. Use the options below to select the Start and the End timeframes as well as specific days of the week.  

Edit rule details

Allows you to specify a value for the selected condition, such as true or false.

The rule details pane also allows you to change your specified alert rule criteria at any time as you create your new alert rule. As you specify criteria using the New Event Alert Rule wizard, the rule details grow to include these additional settings. To edit previously set criteria, click the corresponding setting.