Splitting Notifications for an Alarm

Following are reasons to split notifications.

• Get a notification for each firing metric stream.
• Suppress at the level of a metric stream. SeeAdding a Dimension-Specific Alarm Suppression and Removing a Dimension-Specific Alarm Suppression.
• View status at the level of a metric stream. See Listing Metric Stream Status in an Alarm.
  • You can always view status at the level of the alarm, whether notifications are grouped or split. See Listing Status of Alarms.

For a scenario of split notifications with examples, see Scenario: Split Messages by Metric Stream.

In the following description of split notification behavior, consider an alarm with two trigger rules: a critical trigger rule for 95 percent and a warning trigger rule for 90 percent.

• When many metric streams fire at the same time, then a notification is sent for each firing metric stream and associated trigger rule.
• When the metric stream isn't in firing status, and multiple trigger rules are breached at the same time (such as both the critical 95 percent trigger rule and the warning 90 percent trigger rule), then an metric stream-level notification is sent for the highest-priority trigger rule only (such as critical 95 percent).