# Release: AWS Elastic Beanstalk adds TargetResponseTime Auto Scaling trigger metric on December 19, 2018
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Elastic Beanstalk added the option to trigger Auto Scaling events based on response time for environments with Application Load Balancers.

**Release date:** December 19, 2018

## Changes
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Today's release adds `TargetResponseTime` as a metric to trigger Auto Scaling activity for Elastic Beanstalk environments.

Previously, Elastic Beanstalk required custom `.ebextensions` to configure scaling based on response time for environments with Application Load Balancers. With today's release, you can configure scaling activity directly with the `TargetResponseTime` option in the [https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/command-options-general.html#command-options-general-autoscalingtrigger](https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/command-options-general.html#command-options-general-autoscalingtrigger) namespace. For details, see [Auto Scaling Triggers](https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environments-cfg-autoscaling-triggers.html) in the *AWS Elastic Beanstalk Developer Guide*.