A DevOps engineer is building a continuous deployment pipeline for a serverless application that uses...

Use routing configuration on an alias to send a portion of traffic to a second function version. For example, you can reduce the risk of deploying a new version by configuring the alias to send most of the traffic to the existing version, and only a small percentage of traffic to the new version. https://docs.aws.amazon.com/lambda/latest/dg/configuration-aliases.html

The following are the steps involved in the deploy stage configuration that will meet the requirements:

Use AWS CodeBuild to add sample event payloads for testing to the Lambda functions.

Publish a new version of the functions, and include Amazon CloudWatch alarms.

Update the production alias to point to the new version.

Configure rollbacks to occur when an alarm is in the ALARM state.

This configuration will help to reduce the customer impact of an unsuccessful deployment by deploying the new version of the functions to a staging environment first. This will allow the DevOps engineer to test the new version of the functions before deploying it to production.

The configuration will also help to monitor for issues by including Amazon CloudWatch alarms. These alarms will alert the DevOps engineer if there are any problems with the new version of the functions.