How to use the measured-core.Gauge function in measured-core

getOrCreateGauge(name, callback, dimensions, publishingIntervalInSeconds) {
    validateGaugeOptions(name, callback, dimensions, publishingIntervalInSeconds);
    let gauge;
    if (this._registry.hasMetric(name, dimensions)) {
      gauge = this._registry.getMetric(name, dimensions);
    } else {
      gauge = new Gauge(callback);
      const key = this._registry.putMetric(name, gauge, dimensions);
      this._reporters.forEach(reporter => reporter.reportMetricOnInterval(key, publishingIntervalInSeconds));
    }
    return gauge;
  }