lHostMatch>virtual host name match</a> may have different results.</p><p>Previously, each domain name had its own virtual host. As an optimization, multiple domains may use a single virtual host.
This means that an Envoy Filter previously matching a specific virtual host may now apply to more domains than in previous releases.</p><p>This optimization may be temporarily disabled by setting <code>PILOT_ENABLE_ROUTE_COLLAPSE_OPTIMIZATION=false</code> on the Istiod deployment.</p><h2 id=new-hostpath-added-to-cn