AWS Lambda Function DeadLetterConfig
DeadLetterConfig is a property of the AWS::Lambda::Function resource
that specifies a Dead Letter Queue (DLQ) that AWS Lambda (Lambda) sends events to when it can't
process them. For example, you can send unprocessed events to an Amazon Simple Notification Service (Amazon SNS) topic, where
you can take further action.
The Amazon Resource Name (ARN) of a resource where Lambda delivers unprocessed events, such as an Amazon SNS topic or Amazon Simple Queue Service (Amazon SQS) queue. For the Lambda function execution role, you must explicitly provide the relevant permissions so that access to your DLQ resource is part of the execution role for your Lambda function.