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An auto scaling policy based on average processor utilisation will

  • A.add instances on a fixed schedule set in advance
  • B.add instances but never remove any of them again
  • C.scale on the time of day and on nothing else
  • D.add instances when the average rises above a threshold

Answer: D

Scheduled scaling is a separate mechanism for known patterns. Choosing the right metric matters, since processor use is a poor proxy for load in a memory or input output bound service. The metric should be whichever resource actually saturates first under load.

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