buf.append(e.getKey()).append(": ");
            try {
                buf.append(e.getValue().get());
            } catch (final Exception ex) {
                logger.warn("Failed to process {} task.", e.getKey(), ex);
                buf.append(ex.getMessage());
            }
            buf.append('\n');
        });
        return buf.toString();
    }

    /** The key of the message: Fields */
    public static final String LABELS_FIELDS = "{labels.fields}";

    /** The key of the message: Extended Query */
    public static final String LABELS_ex_q = "{labels.ex_q}";

    /** The key of the message: LDAP URL */
    public static final String LABELS_LDAP_PROVIDER_URL = "{labels.ldapProviderUrl}";

    /** The key of the message: User DN */