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A cooldown period after a scaling action exists to

  • A.stop the metric being collected while capacity changes
  • B.let the new capacity take effect before deciding again
  • C.delay the scaling action itself by a fixed interval
  • D.reduce the hourly cost of the instances in the group

Answer: B

Without it the group reacts to a metric that has not yet responded and overshoots. Flapping between scaling out and in is the usual symptom of too short a cooldown. Each cycle costs launch time and money without ever settling at the right size.

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