# SourceEventMetadataSummary
<a name="API_SourceEventMetadataSummary"></a>

Contains metadata about the event that caused the `NotificationEvent`. For other specific values, see `sourceEventMetadata`.

## Contents
<a name="API_SourceEventMetadataSummary_Contents"></a>

 ** eventType **   <a name="Notifications-Type-SourceEventMetadataSummary-eventType"></a>
The event type to match.  
Must match one of the valid Amazon EventBridge event types. For example, EC2 Instance State-change Notification and Amazon CloudWatch Alarm State Change. For more information, see [Event delivery from AWS services](https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-service-event.html#eb-service-event-delivery-level) in the *Amazon EventBridge User Guide*.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Required: Yes

 ** source **   <a name="Notifications-Type-SourceEventMetadataSummary-source"></a>
The matched event source.  
Must match one of the valid EventBridge sources. Only AWS service sourced events are supported. For example, `aws.ec2` and `aws.cloudwatch`. For more information, see [Event delivery from AWS services](https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-service-event.html#eb-service-event-delivery-level) in the *Amazon EventBridge User Guide*.  
Type: String  
Required: Yes

 ** eventOriginRegion **   <a name="Notifications-Type-SourceEventMetadataSummary-eventOriginRegion"></a>
The Region where the notification originated.  
Unavailable for aggregated notifications.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 32.  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/notifications-2018-05-10/SourceEventMetadataSummary) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/notifications-2018-05-10/SourceEventMetadataSummary) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/notifications-2018-05-10/SourceEventMetadataSummary)