Design an auto-scaling architecture for a web application that handles 10x traffic spikes during flash sales, using target tracking, step scaling, and warm pools to maintain sub-200ms response times.
## Problem
Design an auto-scaling architecture for an e-commerce web application that handles regular traffic of 1,000 requests/second but spikes to 10,000 requests/second during flash sales. The system must scale up within 5 minutes and scale down efficiently after the spike.
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