Exam AWS-SysOps topic 1 question 879 discussion

By implementing a Dead-Letter Queue targeting the Amazon SNS topic, the Lambda function can forward the failed image processing event to the topic after three attempts. This way, developers will be notified about the failure via the Amazon SNS topic.

B is the answer

B. Implement a dead-letter queue targeting the Amazon SNS topic. -- not ideal one C. Modify the Lambda function code to publish failed orders to the Amazon SNS topic before exiting. -- lambda can only retry 2 times. D. Subscribe to Lambda function error notifications from the AWS Personal Health Dashboard. -- ignoring as we dont require Personal Health Dashboard Answer : A

B https://docs.aws.amazon.com/lambda/latest/dg/invocation-async.html

Correct Answer: A

I think A CloudWatch Logs let you invoke a Lambda function when a log entry matches a pattern. Amazon CloudWatch alarms are used to notify when an error occurs with a Lambda function; this notification does not give any specifics about the error. For scenarios where you need specificity on the error in the notification, you can use a CloudWatch Logs subscription. CloudWatch Logs subscriptions let you match entries with a particular error pattern in your log and be notified with those error details. This saves you an extra step to parse through the logs and take necessary action. You can also use this as a blueprint to build automated reactive measures when that error pattern is detected in your Lambda function. https://aws.amazon.com/blogs/mt/get-notified-specific-lambda-function-error-patterns-using-cloudwatch/