public static XdsEndpointGroup of(String listenerName, XdsBootstrap xdsBootstrap,
                                      boolean allowEmptyEndpoints) {
        return new XdsEndpointGroup(new ClusterManager(listenerName, xdsBootstrap), allowEmptyEndpoints);
    }
Creates a {@link XdsEndpointGroup} which listens to the specified listener.
xds/src/main/java/com/linecorp/armeria/xds/client/endpoint/XdsEndpointGroup.java