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AWS AutoScaling Group Leader Election

This terraform module provides a lambda function, which will elect a "leader" instance when receiving an auto scaling event from the specified SNS topic.

The "leader" is a single available instance within the AutoScaling Group which receives a special tag. This is similar to ElasticBeanstalk's concept of a "master" instance, and is useful for scenarios when you need to give a single machine control over the entire cluster, or execute actions only on one machine.