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Gauge

Gauge is an object for representing a custom metric holding only the latest value added. It is one of the four custom metrics.

ParameterTypeDescription
namestringThe name of the custom metric.
isTimebooleanA boolean indicating whether the values added to the metric are time values or just untyped values.
MethodDescription
Gauge.add(value, [tags])Add a value to the gauge metric. Only the latest value added will be kept.

Gauge usage in Thresholds

When gauge is used in a threshold expression, the variable must be called value (lower case). For example:

  • value < 200
  • value > 1

Examples

JavaScript 
import { Gauge } from 'k6/metrics';

const myGauge = new Gauge('my_gauge');

export default function () {
  myGauge.add(3);
  myGauge.add(1);
  myGauge.add(2, { tag1: 'value', tag2: 'value2' });
}
JavaScript 
import http from 'k6/http';
import { sleep } from 'k6';
import { Gauge } from 'k6/metrics';

const GaugeContentSize = new Gauge('ContentSize');

export const options = {
  thresholds: {
    ContentSize: ['value<4000'],
  },
};

export default function () {
  const res = http.get('https://test-api.k6.io/public/crocodiles/1/');
  GaugeContentSize.add(res.body.length);
  sleep(1);
}