AWS EB EnvironmentHealth Monitoring Components

I have a few elastic beanstalk components being monitored and I occasionally get the EnvironmentHealth alerts. When I get that alert, how do I figure out what was the root cause of the alert? In other words what triggered the alert. I tired looking through this documentation: https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environments-health.html. Couldn't figure out.