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What is the reason?

hard📝 Application Q9 of 15
AWS - CloudWatch
A CloudWatch alarm triggers an Auto Scaling policy to add instances, but the number of instances does not increase. The Auto Scaling group has a maximum size of 5, and currently 5 instances are running. What is the reason?
ASNS topic subscription is missing.
BThe alarm threshold is not met.
CThe Auto Scaling group has reached its maximum size limit.
DThe alarm is not linked to any scaling policy.
Step-by-Step Solution
Solution:
  1. Step 1: Check Auto Scaling group size limits

    If the group is already at its maximum size, it cannot add more instances.
  2. Step 2: Understand other options

    Alarm threshold met since alarm triggered; SNS subscription unrelated to scaling; alarm linked to scaling policy as it triggered.
  3. Final Answer:

    The Auto Scaling group has reached its maximum size limit. -> Option C
  4. Quick Check:

    Max size limits prevent scaling beyond set number [OK]
Quick Trick: Auto Scaling respects max size limits, no extra instances added [OK]
Common Mistakes:
MISTAKES
  • Ignoring max size limit effect
  • Confusing SNS subscription with scaling
  • Assuming alarm not linked if triggered

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