}

    /**
     * Log the login failure activity.
     * @param credential The credential.
     */
    public void loginFailure(final OptionalThing<LoginCredential> credential) {
        final Map<String, String> valueMap = new LinkedHashMap<>();
        valueMap.put("action", Action.LOGIN_FAILURE.name());
        credential.ifPresent(c -> {
            valueMap.put("class", c.getClass().getSimpleName());