A startup is launching a social media analytics platform that will experience unpredictable traffic spikes when a piece of content goes viral. Which AWS feature will automatically add or remove Amazon EC2 instances so that the application maintains performance during peaks and reduces cost during lulls?
Amazon EC2 Auto Scaling monitors application load and automatically launches additional EC2 instances when predefined thresholds are exceeded, then terminates them when demand subsides. This keeps response time stable and avoids paying for idle capacity. Elastic Load Balancing only spreads traffic across targets; it does not create or remove instances. Reserved Instances provide discounted pricing for long-term, steady-state usage but cannot respond to sudden spikes. AWS Fargate eliminates server management, yet the number of running tasks still has to be adjusted-typically through ECS Service Auto Scaling-so it is not an out-of-the-box replacement for instance-level Auto Scaling.
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