at’s different between Istio 1.9.0 and Istio 1.9.1.</p><div><aside class="callout tip"><div class=type><svg class="large-icon"><use xlink:href="/v1.21/img/icons.svg#callout-tip"/></svg></div><div class=content>Qualification testing for this release completed successfully on March 3rd, 2021.</div></aside></div><div class="relnote-actions call-to-action"><a class=entry href=/v1.21/news/releases/1.9.x/announcing-1.9/upgrade-notes/><h5>BEFORE YOU UPGRADE</h5><p>Things to know and prepare before upgrading.</p>