Question

A company runs a critical web application behind an Application Load Balancer. Route 53 is configured with a health check that monitors an HTTPS endpoint on the ALB. Operations wants Route 53 to consider the application healthy only when at least 3 of 5 independent backend microservice health checks (each with its own Route 53 health check) are passing, without directly probing a single aggregate endpoint. Which Route 53 configuration meets this requirement?

Accepted Answer

Create a calculated health check that monitors the 5 child health checks and set the health threshold to 3.

Answer

Create an endpoint health check on the ALB with a failure threshold of 3 consecutive checks.

Answer

Create a CloudWatch alarm-based health check that triggers when 3 of 5 metric alarms enter the ALARM state.

Answer

Enable string matching on the ALB endpoint health check to inspect the response body for 3 healthy service tokens.