AWS Elastic Beanstalk
Developer Guide (API Version 2010-12-01)

Understanding Environment Events

Elastic Beanstalk monitors the environment launch process to ensure your application is healthy. To determine your application’s health, Elastic Beanstalk sends periodic requests to the application’s health check URL (by default root or ‘/’). If your application experiences problems and does not respond to the health check, a variety of launch events are published. This section describes the most common launch events, why they happen, and how to address environment launch-related problems. For instructions on how to view your events, see Viewing an Elastic Beanstalk Environment's Event Stream. For more information about health check URL, see Health Check.