he recommended way to upgrade gateways by defining and managing them in a separate <code>IstioOperator</code> CR,
separate from the one used to install and manage the control plane.</p><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.10/img/icons.svg#callout-warning"/></svg></div><div class=content>To avoid problems with <code>.</code> (dot) not being a valid character in some Kubernetes paths, the revision name should not
include <code>.</code> (dots).</div><