ion_seconds</code> latency metric has the new name: <code>istio_request_duration_milliseconds</code>.
The new metric uses milliseconds instead of seconds. We updated the Grafana dashboards to
account for these changes.</li><li>The <code>istio_request_duration_milliseconds</code> metric uses more granular buckets inside the proxy, providing
increased accuracy in latency reporting.</li></ul><h2 id=performance-impact>Performance impact</h2><div><aside class="callout warning"><div class=type><svg class="large-i