# ObservabilityAlarmInput
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Identifies an observability alarm by its ARN.

## Contents
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 ** alarmArn **   <a name="ngresiliencehub-Type-ObservabilityAlarmInput-alarmArn"></a>
The ARN of the CloudWatch alarm.  
Type: String  
Length Constraints: Minimum length of 31. Maximum length of 1024.  
Pattern: `arn:aws[a-zA-Z-]*:cloudwatch:[a-z]{2}(-[a-z]+)+-\d{1}:\d{12}:alarm:.+`   
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\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/resiliencehubv2-2026-02-17/ObservabilityAlarmInput) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/resiliencehubv2-2026-02-17/ObservabilityAlarmInput) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/resiliencehubv2-2026-02-17/ObservabilityAlarmInput)