[Solved] If a CloudWatch alarm is configured with EvaluationPeriods set to 3, what does this mean? — Ans: The alarm evaluates the metric over 3 consecutive periods before changing state | AWS

AWS - CloudWatch

If a CloudWatch alarm is configured with EvaluationPeriods set to 3, what does this mean?

AThe alarm resets every 3 hours automatically

BThe alarm evaluates the metric over 3 consecutive periods before changing state

CThe alarm only monitors 3 metrics simultaneously

DThe alarm triggers after 3 manual confirmations

Step-by-Step Solution

Solution:

Step 1: Understand EvaluationPeriods meaning
EvaluationPeriods defines how many consecutive periods the metric must breach threshold.
Step 2: Interpret the effect
The alarm changes state only if the breach happens in all 3 periods consecutively.
Final Answer:
Alarm evaluates metric over 3 consecutive periods before state change -> Option B
Quick Check:
EvaluationPeriods = consecutive periods to confirm breach [OK]

Quick Trick: EvaluationPeriods means consecutive periods to confirm alarm [OK]

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If a CloudWatch alarm is configured with EvaluationPeriods set to 3, what does this mean?