aggregate-metric-logger

aggregate-metric-logger

aggregate metrics in memory and log them every minute

Setup

Set METRIC_LOGGER_ENABLED env variable to true for aggregate-metric-logger to start collecting and logging measuremnts.

To change the default aggregate-metric-logger namespace used for logs, set METRIC_LOGGER_NAMESPACE to a custom value.

Usage

If you want aggregate measuremts about something you need to simply call the call method for each value:

const metrictLogger = require('aggregate-metric-logger')

metricLogger.count('thing-to-count', 14)
metricLogger.count('thing-to-count', 20)

Every minute metric logger will log min, max, sum, count and avarage aggregated metrics for each measured tags. (Uses @emartech/json-logger behind the scenes for logging).

Measuring durations

For duration measuremts, there are two convinience methods: start, and stop;

You start the measurement with start, the counted value for aggregation will be the duration between this start and the matcing stop call;

function exampleIOHeavyFunction() {
  const measurementId = metricLogger.start('tag-for-the-measuement');
  const result = db.findItems();
  metricLogger.stop(measurementId);
  return result;
}