@dxos/metrics NPM

Metrics

A simple, lightweight and extensible metrics gathering system.

Install

$ npm install @dxos/metrics

Usage

Metrics can either be submitted to the root object:

import metrics from '@dxos/metrics';

metrics.inc('work.started');

or to a nested object:

import metrics from '@dxos/metrics';

class Test {
  _metrics = metrics(Test);

  work() {
    this._metrics.inc('work.started');
  }
}

Nested Metrics objects are scoped and allow for filtering.

metrics.filter({ source: Test, key: 'work.started' });

All metrics are passed up to successive Metrics objects.

Counters

import metrics from '@dxos/metrics';

metrics.inc('counter');
metrics.inc('counter');
metrics.inc('counter');

expect(metrics.get('counter').toEqual(metrics.filter({ key: 'counter' }).length);

Time Series

import metrics from '@dxos/metrics';

const work = async () => {
  const period = metrics.start('work');
  await new Promise((resolve) => setTimeout(resolve, Math.random() * 100));
  period.end();
};