Auto Scaling is a web service designed to launch or terminate Amazon EC2 instances automatically based on user-defined policies, schedules, and health checks.

Developer Guide
Provides a conceptual overview of Auto Scaling and includes detailed instructions for using the various features.
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API Reference
Describes all the API operations for Auto Scaling in detail. Also provides sample requests, responses, and errors for the supported web services protocols.
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  Auto Scaling section of the AWS CLI Reference
Describes the AWS CLI commands that you can use to administer Auto Scaling. Provides syntax, options, and usage examples for each command.
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