<p>The Amazon Resource Name (ARN) of the IAM service role for Amazon Web Services Systems Manager to assume when running a maintenance window task. If you do not specify a service role ARN, Systems Manager uses your account's service-linked role. If no service-linked role for Systems Manager exists in your account, it is created when you run <code>RegisterTaskWithMaintenanceWindow</code>.</p> <p>For more information, see the following topics in the in the <i>Amazon Web Services Systems Manager User Guide</i>:</p> <ul> <li> <p> <a href="https://docs.aws.amazon.com/systems-manager/latest/userguide/using-service-linked-roles.html#slr-permissions">Using service-linked roles for Systems Manager</a> </p> </li> <li> <p> <a href="https://docs.aws.amazon.com/systems-manager/latest/userguide/sysman-maintenance-permissions.html#maintenance-window-tasks-service-role">Should I use a service-linked role or a custom service role to run maintenance window tasks? </a> </p> </li> </ul>

<p>The maximum number of targets this task can be run for, in parallel.</p> <note> <p>Although this element is listed as "Required: No", a value can be omitted only when you are registering or updating a <a href="https://docs.aws.amazon.com/systems-manager/latest/userguide/maintenance-windows-targetless-tasks.html">targetless task</a> You must provide a value in all other cases.</p> <p>For maintenance window tasks without a target specified, you can't supply a value for this option. Instead, the system inserts a placeholder value of <code>1</code>. This value doesn't affect the running of your task.</p> </note>

<p>The maximum number of errors allowed before this task stops being scheduled.</p> <note> <p>Although this element is listed as "Required: No", a value can be omitted only when you are registering or updating a <a href="https://docs.aws.amazon.com/systems-manager/latest/userguide/maintenance-windows-targetless-tasks.html">targetless task</a> You must provide a value in all other cases.</p> <p>For maintenance window tasks without a target specified, you can't supply a value for this option. Instead, the system inserts a placeholder value of <code>1</code>. This value doesn't affect the running of your task.</p> </note>

<p>Indicates whether tasks should continue to run after the cutoff time specified in the maintenance windows is reached. </p> <ul> <li> <p> <code>CONTINUE_TASK</code>: When the cutoff time is reached, any tasks that are running continue. The default value.</p> </li> <li> <p> <code>CANCEL_TASK</code>:</p> <ul> <li> <p>For Automation, Lambda, Step Functions tasks: When the cutoff time is reached, any task invocations that are already running continue, but no new task invocations are started.</p> </li> <li> <p>For Run Command tasks: When the cutoff time is reached, the system sends a <a>CancelCommand</a> operation that attempts to cancel the command associated with the task. However, there is no guarantee that the command will be terminated and the underlying process stopped.</p> </li> </ul> <p>The status for tasks that are not completed is <code>TIMED_OUT</code>.</p> </li> </ul>