• 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 Maintenance Windows Maintenance Windows, a tool in Amazon Systems Manager, helps you define a schedule for when to perform potentially disruptive actions on your nodes such as patching an operating system, updating drivers, or installing software or patches. **Note** State Manager and Maintenance Windows can perform some similar types of updates on your managed nodes. Which one you choose depends on whether you need to automate system compliance or perform high-priority, time-sensitive tasks during periods you specify. For more information, see [Choosing between State Manager and Maintenance Windows](state-manager-vs-maintenance-windows.md). With Maintenance Windows, you can schedule actions on numerous other Amazon resource types, such as Amazon Simple Storage Service (Amazon S3) buckets, Amazon Simple Queue Service (Amazon SQS) queues, Amazon Key Management Service (Amazon KMS) keys, and many more. For a full list of supported resource types that you can include in a maintenance window target, see [Resources you can use with Amazon Resource Groups and Tag Editor](https://docs.amazonaws.cn/ARG/latest/userguide/supported-resources.html#supported-resources-console) in the *Amazon Resource Groups User Guide*. To get started with Maintenance Windows, open the [Systems Manager console](https://console.amazonaws.cn//systems-manager/maintenance-windows). In the navigation pane, choose **Maintenance Windows**. Each maintenance window has a schedule, a maximum duration, a set of registered targets (the managed nodes or other Amazon resources that are acted upon), and a set of registered tasks. You can add tags to your maintenance windows when you create or update them. (Tags are keys that help identify and sort your resources within your organization.) You can also specify dates that a maintenance window shouldn't run before or after, and you can specify the international time zone on which to base the maintenance window schedule. For an explanation of how the various schedule-related options for maintenance windows relate to one another, see [Maintenance window scheduling and active period options](maintenance-windows-schedule-options.md). For more information about working with the `--schedule` option, see [Reference: Cron and rate expressions for Systems Manager](reference-cron-and-rate-expressions.md). **Supported task types** With maintenance windows, you can run four types of tasks: + Commands in Run Command, a tool in Systems Manager For more information about Run Command, see [Amazon Systems Manager Run Command](run-command.md). + Workflows in Automation, a tool in Systems Manager For more information about Automation workflows, see [Amazon Systems Manager Automation](systems-manager-automation.md). + Functions in Amazon Lambda For more information about Lambda functions, see [Getting started with Lambda](https://docs.amazonaws.cn/lambda/latest/dg/getting-started.html) in the *Amazon Lambda Developer Guide*. + Tasks in Amazon Step Functions **Note** Maintenance window tasks support Step Functions Standard state machine workflows only. They don't support Express state machine workflows. For information about state machine workflow types, see [Standard vs. Express Workflows](https://docs.amazonaws.cn/step-functions/latest/dg/concepts-standard-vs-express.html) in the *Amazon Step Functions Developer Guide*. For more information about Step Functions, see the *[Amazon Step Functions Developer Guide](https://docs.amazonaws.cn/step-functions/latest/dg/)*. This means you can use maintenance windows to perform tasks such as the following on your selected targets. + Install or update applications. + Apply patches. + Install or update SSM Agent. + Run PowerShell commands and Linux shell scripts by using a Systems Manager Run Command task. + Build Amazon Machine Images (AMIs), boot-strap software, and configure nodes by using a Systems Manager Automation task. + Run Amazon Lambda functions that invokes additional actions, such as scanning your nodes for patch updates. + Run Amazon Step Functions state machines to perform tasks such as removing a node from an Elastic Load Balancing environment, patching the node, and then adding the node back to the Elastic Load Balancing environment. + Target nodes that are offline by specifying an Amazon resource group as the target. **Note** One or more targets must be specified for maintenance window Run Command-type tasks. Depending on the task, targets are optional for other maintenance window task types (Automation, Amazon Lambda, and Amazon Step Functions). For more information about running tasks that don't specify targets, see [Registering maintenance window tasks without targets](maintenance-windows-targetless-tasks.md). **EventBridge support** This Systems Manager tool is supported as an *event* type in Amazon EventBridge rules. For information, see [Monitoring Systems Manager events with Amazon EventBridge](monitoring-eventbridge-events.md) and [Reference: Amazon EventBridge event patterns and types for Systems Manager](reference-eventbridge-events.md). **Topics** + [Setting up Maintenance Windows](setting-up-maintenance-windows.md) + [Create and manage maintenance windows using the console](sysman-maintenance-working.md) + [Tutorials](maintenance-windows-tutorials.md) + [Using pseudo parameters when registering maintenance window tasks](maintenance-window-tasks-pseudo-parameters.md) + [Maintenance window scheduling and active period options](maintenance-windows-schedule-options.md) + [Registering maintenance window tasks without targets](maintenance-windows-targetless-tasks.md) + [Troubleshooting maintenance windows](troubleshooting-maintenance-windows.md)