 upgrade</code> command.</div></aside></div><p>If you installed Istio using <code>--set</code> flags, ensure that you pass the same <code>--set</code> flags to upgrade,
otherwise the customizations done with <code>--set</code> will be reverted. For production use, the use of a
configuration file instead of <code>--set</code> is recommended.</p><p>If you omit the <code>-f</code> flag, Istio upgrades using the default profile.</p><p>After performing several checks, <code>istioctl</code> will ask you to confir