Discussion
Assertion (A): Without a cooldown an auto scaling group can oscillate between adding and removing capacity.
Reason (R): It reacts to a metric that has not yet reflected the previous action.
Answer: C
Both are true and the reason gives the mechanism, and the oscillation costs money and destabilises the service at the same time, and it is entirely avoidable by widening the thresholds. A gap of twenty points between scale out and scale in is a common starting value.
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