# Primary
<a name="API_Primary"></a>

The primary Region of the endpoint.

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

 ** HealthCheck **   <a name="eventbridge-Type-Primary-HealthCheck"></a>
The ARN of the health check used by the endpoint to determine whether failover is triggered.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 1600.  
Pattern: `^arn:aws([a-z]|\-)*:route53:::healthcheck/[\-a-z0-9]+$`   
Required: Yes

## 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/eventbridge-2015-10-07/Primary) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/eventbridge-2015-10-07/Primary) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/eventbridge-2015-10-07/Primary)