final StringBuilder buf = new StringBuilder();
        updateConfigListenerMap.entrySet().stream().forEach(e -> {
            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());
            }