How to get latency metric from AWS CloudWatch Application ELB?

Question

Is there any way to get latency from AWS/ApplicationELB namespace? I know it is available in the AWS/ELB namespace, but I need it for AWS/ApplicationELB, as this is what I use.

Answer 1

The latency metric on ELB is comparable to the TargetResponseTime metric on ALB.

ELB Latency definition: (source)

The total time elapsed, in seconds, from the time the load balancer sent the request to a registered instance until the instance started to send the response headers.

ALB TargetResponseTime definition: (source)

The time elapsed, in seconds, after the request leaves the load balancer until a response from the target is received. This is equivalent to the target_processing_time field in the access logs.

Further Reading

• AWS Documentation - CloudWatch Metrics for Your Application Load Balancer