Question

A SysOps administrator monitors a customer-facing API served by an Application Load Balancer. Overall average latency looks healthy, but customers report intermittent slow responses. The administrator needs an alarm that fires when the slowest 1% of requests exceed 2 seconds over a 5-minute period, so that only the worst-affected requests trigger a notification. How should the administrator configure the CloudWatch alarm on the ALB TargetResponseTime metric?

Accepted Answer

Create an alarm on the p99 percentile statistic of TargetResponseTime with a threshold of 2 seconds over a 5-minute period

Answer

Create an alarm on the Average statistic of TargetResponseTime with a threshold of 2 seconds over a 5-minute period

Answer

Create an alarm on the Maximum statistic of TargetResponseTime with a threshold of 2 seconds over a 5-minute period

Answer

Create an alarm on the Sum statistic of TargetResponseTime with a threshold of 2 seconds over a 5-minute period