f=https://github.com/istio/istio/issues/13853>Issue 13853</a>).</li><li>In prior releases Pilot automatically injected the experimental <code>envoy.filters.network.mysql_proxy</code> filter into the outbound filter chain if the service port name is <code>mysql</code>. This was surprising and caused issues for some operators, so Pilot will now automatically inject the <code>envoy.filters.network.mysql_proxy</code> filter only if the <code>PILOT_ENABLE_MYSQL_FILTER</code> environment variable is set to <code>