Amazon EC2 application status checks

Amazon EC2 application status checks (10 August 2026) send HTTP or HTTPS from a managed ENI in your VPC every 60 seconds. Protocol is HTTP/HTTPS only; port is any 1–65535 (8080, 8081, 8443 — not only 80/443). The check works without an ALB. With an ALB, probe the instance listener, not the load balancer. Auto Scaling replaces instances whose overall application status is impaired — no extra group health-check type.

Create the check with aggregation excluded, associate by tag or aws:autoscaling:groupName, verify reason codes, then include. Billing is $0.01/hour per managed ENI per AZ plus CloudWatch. Keep ALB health checks for traffic steering.