• The Amazon Systems Manager CloudWatch Dashboard will no longer be available after April 30, 2026. Customers can continue to use Amazon CloudWatch console to view, create, and manage their Amazon CloudWatch dashboards, just as they do today. For more information, see [Amazon CloudWatch Dashboard documentation](https://docs.amazonaws.cn/AmazonCloudWatch/latest/monitoring/CloudWatch_Dashboards.html). 

# Amazon Systems Manager reference
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The following information and topics can help you better implement Amazon Systems Manager solutions.

**Principal**  
In Amazon Identity and Access Management (IAM), you can grant or deny a service access to resources using the Principal policy element. The Principal policy element value for Systems Manager is `ssm.amazonaws.com.cn`.

 **Supported Amazon Web Services Regions and endpoints **  
See [Systems Manager service endpoints](https://docs.amazonaws.cn/general/latest/gr/ssm.html#ssm_region) in the *Amazon Web Services General Reference*.

 **Service Quotas**  
See [Systems Manager service quotas](https://docs.amazonaws.cn/general/latest/gr/ssm.html#limits_ssm) in the *Amazon Web Services General Reference*.

 **API Reference**  
See *[Amazon Systems Manager API Reference](https://docs.amazonaws.cn/systems-manager/latest/APIReference/)*.

 **Amazon CLI Command Reference**  
See [Amazon Systems Manager section of the Amazon CLI Command Reference](https://docs.amazonaws.cn/cli/latest/reference/ssm/index.html).

 **Amazon Tools for PowerShell Cmdlet Reference**  
See [Amazon Systems Manager section of the Amazon Tools for PowerShell Cmdlet Reference](https://docs.amazonaws.cn/powershell/latest/reference/items/AWS_Systems_Manager_cmdlets.html).

 **SSM Agent Repository on GitHub**  
See [aws/amazon-ssm-agent](https://github.com/aws/amazon-ssm-agent).

 **Ask a Question**  
[Amazon Systems Manager Developer Forum](https://forums.aws.csdn.net//)

**Topics**
+ [Using this service with an Amazon SDK](sdk-general-information-section.md)
+ [Reference: Amazon S3 buckets for patching operations](patch-operations-s3-buckets.md)
+ [Reference: Amazon EventBridge event patterns and types for Systems Manager](reference-eventbridge-events.md)
+ [Reference: Cron and rate expressions for Systems Manager](reference-cron-and-rate-expressions.md)
+ [Reference: ec2messages, ssmmessages, and other API operations](systems-manager-setting-up-messageAPIs.md)
+ [Reference: Date and time string formats for Systems Manager](systems-manager-datetime-strings.md)