Question:
Which of these scenarios is a suitable candidate for autoscaling?
Answer:
Changes in application load that are predictable are good candidates for autoscaling.
Organization running a promotion: Manual scaling is a better option here since this is a one-off event with a known duration.
Sudden influx of requests: The increasing burst of activity could be caused by a Denial of Service attack that is attempting to overwhelm your system. Autoscaling wouldn't solve the problem.