How Do I Determine the Server Response Time Based on Monitoring Data and Logs?

For HTTP and HTTPS load balancing, you can view the average server response time through monitoring metric and view the response time of each request from access logs.

1. On the ELB console, click the name of the load balancer.
2. On the Monitoring tab page, select an HTTP or HTTPS listener added to the load balancer.
3. Check the Average Server Response Time metric to view the average time that backend servers respond to requests routed by the load balancer.

   Table 1 Average response time

   Metric	Definition
   Average Server Response Time	Average time that backend servers respond to requests from the load balancer (This metric is available only when the frontend protocol is HTTP or HTTPS.) The process starts when the load balancer routes the requests to backend servers and ends when it receives responses from backend servers. Unit: ms

4. Check access logs to view the response time of each request.

The request_time, upstream_connect_time, upstream_header_time, or upstream_response_time fields in the access log reflect the time required for a load balancer to route a request to the corresponding backend server.