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AZ-305 · Compute design

Practice question 244 of 400 · hard

A VM scale set rapidly alternates between adding and removing workers. Which two adjustments address the instability? Select 2 answers.

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  1. A.Remove the maximum count so every burst creates unlimited instances
  2. B.Use appropriate metric aggregation windows and autoscale cooldowns
  3. C.Set realistic minimum and maximum instance counts and validate threshold behavior
  4. D.Scale in immediately whenever one worker has a brief low-CPU sample
  5. E.Store all worker progress only in instance memory
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✓ Correct answers

  • Use appropriate metric aggregation windows and autoscale cooldowns
  • Set realistic minimum and maximum instance counts and validate threshold behavior

Aggregation, cooldowns, and sensible bounds reduce reaction to transient samples and control capacity. Unbounded scaling risks cost and dependency overload, immediate scale-in encourages oscillation, and memory-only progress threatens durability rather than fixing control behavior. Source guide: PDF page(s) 45.

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