@Nullable
        Boolean isManaged() {
            return managed;
        }
Adds a {@link Consumer} that performs additional configuration operations against
the Jetty {@link Server} created by a {@link JettyService}.

@deprecated Use {@link #customizer(Consumer)}.
jetty/jetty11/src/main/java/com/linecorp/armeria/server/jetty/AbstractJettyServiceBuilder.java