# RollbackDetails
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Details about an instance refresh rollback.

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

 ** InstancesToUpdateOnRollback **   
Indicates the value of `InstancesToUpdate` at the time the rollback started.  
Type: Integer  
Valid Range: Minimum value of 0.  
Required: No

 ** PercentageCompleteOnRollback **   
Indicates the value of `PercentageComplete` at the time the rollback started.  
Type: Integer  
Valid Range: Minimum value of 0. Maximum value of 100.  
Required: No

 ** ProgressDetailsOnRollback **   
Reports progress on replacing instances in an Auto Scaling group that has a warm pool. This includes separate details for instances in the warm pool and instances in the Auto Scaling group (the live pool).  
Type: [InstanceRefreshProgressDetails](API_InstanceRefreshProgressDetails.md) object  
Required: No

 ** RollbackReason **   
The reason for this instance refresh rollback (for example, whether a manual or automatic rollback was initiated).  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 1023.  
Pattern: `[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*`   
Required: No

 ** RollbackStartTime **   
The date and time at which the rollback began.  
Type: Timestamp  
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/autoscaling-2011-01-01/RollbackDetails) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/autoscaling-2011-01-01/RollbackDetails) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/autoscaling-2011-01-01/RollbackDetails)