labelsToTags(itemLabels) {
		const labels = Object.assign({}, this.defaultLabels || {}, itemLabels || {});
		const keys = Object.keys(labels);
		if (keys.length == 0) return "";

		return keys
			.map(key => `${this.formatLabelName(key)}:${this.escapeLabelValue(labels[key])}`)
			.join(",");
	}
Convert labels to StatsD label string

@param {Object} itemLabels
@returns {Array<String>}

@memberof StatsDReporter