Trigger an alarm-based rollback

You deploy version 3.0 of your payments Lambda function using CodeDeployDefault.LambdaCanary10Percent5Minutes. You have a CloudWatch alarm attached to the deployment group that fires when the Lambda Errors metric exceeds 5 in a 1-minute period.

Two minutes into the canary window, the alarm enters the ALARM state. What percentage of your total traffic was exposed to the buggy version before the rollback began?