ELB Instance Health
Elastic Load Balancing (ELB) Instance Health is an AWS feature that provides a real-time view of the health and availability of EC2 instances in an Auto Scaling group. ELB performs periodic health checks to determine the health status of each instance, and automatically reroutes traffic away from unhealthy instances to maintain performance and minimize disruption. ELB also maintains a detailed set of metrics for each instance to track its overall availability, allowing you to quickly identify potential issues before they affect your applications or services. Furthermore, ELB can be integrated with other AWS services such as CloudWatch and SNS to provide additional functionality such as automated notifications when a certain threshold is breached or when an unhealthy instance is detected.