auth.processSLO();
                final List<String> errors = auth.getErrors();
                if (errors.isEmpty()) {
                    throw new SsoMessageException(messages -> messages.addSuccessSsoLogout(UserMessages.GLOBAL_PROPERTY_KEY), "Logged out");
                }
                final String msg = errors.stream().collect(Collectors.joining(", "));
                throw new SsoMessageException(

     * <pre>
     * message: You have been logged out.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addSuccessSsoLogout(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(SUCCESS_sso_logout));
        return this;
    }

    /**