# UpgradeHistory
<a name="API_UpgradeHistory"></a>

History of the last 10 upgrades and upgrade eligibility checks for an Amazon OpenSearch Service domain.

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

 ** StartTimestamp **   <a name="opensearchservice-Type-UpgradeHistory-StartTimestamp"></a>
UTC timestamp at which the upgrade API call was made, in the format `yyyy-MM-ddTHH:mm:ssZ`.  
Type: Timestamp  
Required: No

 ** StepsList **   <a name="opensearchservice-Type-UpgradeHistory-StepsList"></a>
A list of each step performed as part of a specific upgrade or upgrade eligibility check.  
Type: Array of [UpgradeStepItem](API_UpgradeStepItem.md) objects  
Required: No

 ** UpgradeName **   <a name="opensearchservice-Type-UpgradeHistory-UpgradeName"></a>
A string that describes the upgrade.  
Type: String  
Required: No

 ** UpgradeStatus **   <a name="opensearchservice-Type-UpgradeHistory-UpgradeStatus"></a>
 The current status of the upgrade. The status can take one of the following values:   
+ In Progress
+ Succeeded
+ Succeeded with Issues
+ Failed
Type: String  
Valid Values: `IN_PROGRESS | SUCCEEDED | SUCCEEDED_WITH_ISSUES | FAILED`   
Required: No

## See Also
<a name="API_UpgradeHistory_SeeAlso"></a>

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/opensearch-2021-01-01/UpgradeHistory) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/opensearch-2021-01-01/UpgradeHistory) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/opensearch-2021-01-01/UpgradeHistory)