# StackInstanceSummary


The structure that contains summary information about a stack instance.

## Contents


 ** Account **   
[Self-managed permissions] The name of the Amazon Web Services account that the stack instance is associated with.  
Type: String  
Pattern: `^[0-9]{12}$`   
Required: No

 ** DriftStatus **   
Status of the stack instance's actual configuration compared to the expected template and parameter configuration of the StackSet it belongs to.  
+  `DRIFTED`: The stack differs from the expected template and parameter configuration of the StackSet it belongs to. A stack instance is considered to have drifted if one or more of the resources in the associated stack have drifted.
+  `NOT_CHECKED`: CloudFormation hasn't checked if the stack instance differs from its expected StackSet configuration.
+  `IN_SYNC`: The stack instance's actual configuration matches its expected StackSet configuration.
+  `UNKNOWN`: This value is reserved for future use.
Type: String  
Valid Values: `DRIFTED | IN_SYNC | UNKNOWN | NOT_CHECKED`   
Required: No

 ** LastDriftCheckTimestamp **   
Most recent time when CloudFormation performed a drift detection operation on the stack instance. This value will be `NULL` for any stack instance that drift detection hasn't yet been performed on.  
Type: Timestamp  
Required: No

 ** LastOperationId **   
The last unique ID of a StackSet operation performed on a stack instance.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `[a-zA-Z0-9][-a-zA-Z0-9]*`   
Required: No

 ** OrganizationalUnitId **   
[Service-managed permissions] The organization root ID or organizational unit (OU) IDs that you specified for [DeploymentTargets](https://docs.amazonaws.cn/AWSCloudFormation/latest/APIReference/API_DeploymentTargets.html).  
Type: String  
Pattern: `^(ou-[a-z0-9]{4,32}-[a-z0-9]{8,32}|r-[a-z0-9]{4,32})$`   
Required: No

 ** Region **   
The name of the Amazon Web Services Region that the stack instance is associated with.  
Type: String  
Pattern: `^[a-zA-Z0-9-]{1,128}$`   
Required: No

 ** StackId **   
The ID of the stack instance.  
Type: String  
Required: No

 ** StackInstanceStatus **   
The detailed status of the stack instance.  
Type: [StackInstanceComprehensiveStatus](API_StackInstanceComprehensiveStatus.md) object  
Required: No

 ** StackSetId **   
The name or unique ID of the StackSet that the stack instance is associated with.  
Type: String  
Required: No

 ** Status **   
The status of the stack instance, in terms of its synchronization with its associated stack set.  
+  `INOPERABLE`: A `DeleteStackInstances` operation has failed and left the stack in an unstable state. Stacks in this state are excluded from further `UpdateStackSet` operations. You might need to perform a `DeleteStackInstances` operation, with `RetainStacks` set to `true`, to delete the stack instance, and then delete the stack manually. `INOPERABLE` can be returned here when the cause is a failed import. If it's due to a failed import, the operation can be retried once the failures are fixed. To see if this is due to a failed import, call the [DescribeStackInstance](API_DescribeStackInstance.md) API operation, look at the `DetailedStatus` member returned in the `StackInstanceSummary` member.
+  `OUTDATED`: The stack isn't currently up to date with the StackSet because:
  + The associated stack failed during a `CreateStackSet` or `UpdateStackSet` operation.
  + The stack was part of a `CreateStackSet` or `UpdateStackSet` operation that failed or was stopped before the stack was created or updated.
+  `CURRENT`: The stack is currently up to date with the StackSet.
Type: String  
Valid Values: `CURRENT | OUTDATED | INOPERABLE`   
Required: No

 ** StatusReason **   
The explanation for the specific status code assigned to this stack instance.  
Type: String  
Required: No

## See Also


For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/cloudformation-2010-05-15/StackInstanceSummary) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/cloudformation-2010-05-15/StackInstanceSummary) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/cloudformation-2010-05-15/StackInstanceSummary)