AWS - CloudWatch
You want to create a CloudWatch alarm that triggers an auto-scaling action when average CPU utilization exceeds 60% for 5 minutes, but only if this happens during business hours (9 AM to 5 PM). Which approach best achieves this?
Which approach best achieves this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand alarm and time condition needs
CloudWatch alarms alone cannot restrict triggering by time; external logic is needed.Step 2: Evaluate options for time-based control
Using a Lambda triggered by the alarm to check current time and decide on scaling is flexible and precise.Step 3: Assess other options
EventBridge can schedule events but not filter alarm triggers by time; auto-scaling ignores alarms is not a feature.Final Answer:
Create a CloudWatch alarm with threshold 60% and EvaluationPeriods 5, then use a Lambda function triggered by the alarm to check time and trigger scaling -> Option CQuick Check:
Alarm + Lambda time check = controlled scaling [OK]
Quick Trick: Use Lambda to add time logic after alarm triggers [OK]
Common Mistakes:
- Expecting alarm to handle time filtering alone
- Assuming auto-scaling ignores alarms by time
- Using EventBridge without alarm integration
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