Description

Update Auto Scaling Group (ASG) configuration values such as min size, max size, desired capacity, or launch template. Only the fields you provide are changed; others are left unchanged. This action is useful for:

Temporarily bumping max size during instance rotation so the ASG can launch a replacement before the old instance is terminated
Scaling up desired capacity during a load incident (often combined with Describe Auto Scaling Groups to read current values first)
Updating the launch template version for rolling updates or remediation
Automating capacity changes in runbooks based on incident or prior-step outputs

Instructions

Inputs

Name	Description
Integration	Select a Workflow Integration or click New AWS Connection to establish a new one.
Auto Scaling Group Name	The name of the Auto Scaling Group to update.
AWS Region	The AWS region where the Auto Scaling Group is located. If left blank, the action uses `us-east-1` as the default.
Minimum Size	(Optional.) New minimum size. Omit to leave unchanged.
Maximum Size	(Optional.) New maximum size. Omit to leave unchanged.
Desired Capacity	(Optional.) New desired capacity. Omit to leave unchanged.
New Launch Template	(Optional.) Launch template to switch to. Can include Launch Template ID, Launch Template Name, and Version. Omit to leave the current launch template unchanged.

Outputs

Name	Description
ASG Name	The Auto Scaling Group that was updated.
Applied	JSON object of the values that were sent (minSize, maxSize, desiredCapacity, launchTemplate) for auditability.
Result	Whether the action succeeded: Success or Failed.
Result Summary	Brief description of what the action did or if it failed.
Error	Error message, if the action failed.

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Tips

Partial Updates: Only include inputs you want to change; omitting Minimum Size, Maximum Size, Desired Capacity, or New Launch Template leaves those settings unchanged.

Instance Rotation: For rotate-instance workflows, use Describe Auto Scaling Groups and a Logic step first to compute the new max size, then pass it into this action's Maximum Size input.