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A CloudWatch alarm is set to notify an SNS topic, but no notifications are received. What is a possible error?

medium📝 Debug Q7 of 15
AWS - CloudWatch
A CloudWatch alarm is set to notify an SNS topic, but no notifications are received. What is a possible error?
AThe alarm is configured with an Auto Scaling policy ARN.
BThe alarm threshold is set too high.
CThe SNS topic has no confirmed subscriptions.
DCloudWatch alarms cannot send notifications to SNS.
Step-by-Step Solution
Solution:

  1. Step 1: Check SNS topic subscriptions

    If the SNS topic has no confirmed subscriptions, no notifications will be delivered.

  2. Step 2: Understand other options

    Alarm with Auto Scaling ARN triggers scaling, not notifications; threshold affects triggering; CloudWatch alarms can send to SNS.

  3. Final Answer:

    The SNS topic has no confirmed subscriptions. -> Option C

  4. Quick Check:

    SNS needs confirmed subscriptions for notifications [OK]
Quick Trick: Confirm SNS subscriptions to receive notifications [OK]
Common Mistakes:
  • Assuming Auto Scaling ARN sends notifications
  • Ignoring subscription confirmation
  • Believing CloudWatch can't notify SNS

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