title: Ambassador metric representing request process time
body: <p>I have Ambassador deployed with Istio. StatsD exporter is in place and Grafana dashboard 4698 (<a href="https://grafana.com/dashboards/4698" rel="nofollow noreferrer">https://grafana.com/dashboards/4698</a>). </p>
  
  <p>But it seems there is no metric simply showing the time taken to get a response.</p>
  
  <p>envoy_listener_0_0_0_0_80_downstream_cx_length_ms - has confusing values( with all quantiles)
  http_request_duration_microseconds - when converted to milliseconds gives values like 10-20 ms (0.5 - 0.99 quantile) and this is not real either.</p>
  
  <p>Only 2 metrics are working properly:
  envoy_cluster_cluster_ext_auth_upstream_rq_time
  envoy_cluster_cluster_ext_ratelimit_upstream_rq_time</p>
  
  <p>But these are showing time taken to process request by authentication and ratelimiting services.</p>
  
  <p>How can I get time taken to process whole request? From the moment it hit Ambassador to the moment response was received?</p>