messageType

The type of notification that triggers Config to run an evaluation for a rule. You can specify the following notification types:

• ConfigurationItemChangeNotification - Triggers an evaluation when Config delivers a configuration item as a result of a resource change.

• OversizedConfigurationItemChangeNotification - Triggers an evaluation when Config delivers an oversized configuration item. Config may generate this notification type when a resource changes and the notification exceeds the maximum size allowed by Amazon SNS.

• ScheduledNotification - Triggers a periodic evaluation at the frequency specified for MaximumExecutionFrequency.

• ConfigurationSnapshotDeliveryCompleted - Triggers a periodic evaluation when Config delivers a configuration snapshot.

If you want your custom rule to be triggered by configuration changes, specify two SourceDetail objects, one for ConfigurationItemChangeNotification and one for OversizedConfigurationItemChangeNotification.