Add instructions for alerting user if lambda script fails

[yanokwa]

The forwarder basically works but I don't know what happens if the lambda fails. It'd be great to get some alert.

[anmolsahoo25]

You can add an SNS action while creating the Lambda function in the DLQ field of Advanced settings while creating and subscribe to that SNS topic. I guess that should help your case, instead of building it into the code, since the AWS Lambda can handle it and fire off a notification to you with the error?

Even though I am late, this is just for the reference of future users.