Elastic Load Balancers are configured to send traffic to EC2 instances (for Classic type) or target groups (for Application and Network type). When there are fewer available targets that can receive traffic than expected, the load balancer is considered unhealthy. When this happens, the remaining targets will handle the full amount of requests, which can quickly overwhelm your application.
Blue Matador detects when the hosts in your load balancer are unhealthy and alerts you. To troubleshoot unhealthy hosts try the following: