setToCurrentTime(labels) {
		const now = Date.now() / 1000;
		if (labels === undefined) {
			this.set(now);
		} else {
			this.set(labels, now);
		}
	}
Set the gauge to current unix epoch
@param {object} labels - Object with labels where key is the label key and value is label value. Can only be one level deep
@returns {void}