What service provides automatic scaling based on CPU usage?

AWS Auto Scaling is the service designed to automatically adjust the number of EC2 instances or other resources in response to changing demands based on defined metrics, such as CPU usage. This functionality ensures that applications have the necessary resources to maintain performance during traffic spikes while also reducing costs by scaling down during quieter periods.

Auto Scaling works by monitoring the CPU utilization of instances and other parameters you specify. When predefined thresholds are met, it triggers the scaling activities: launching new instances if demand increases or terminating instances when demand decreases. This automated scaling process enhances the application's availability and performance while optimizing resource usage.

In contrast, AWS Elastic Beanstalk also supports scaling, but it does so through a managed service approach that abstracts much of the underlying infrastructure management. While it may utilize Auto Scaling under the hood, it's not directly responsible for the scaling actions based solely on CPU usage.

Amazon Simple Queue Service (SQS) focuses on message queuing and decoupling distributed systems rather than on resource scaling, and Amazon RDS (Relational Database Service) is primarily a managed database service that includes features like automatic backups and maintenance but does not inherently handle scaling of CPU for EC2 instances. Thus, AWS Auto Scaling stands out as the appropriate solution for automatic scaling based on CPU usage