Standard Deviation

Grafana k6
8

Just try this format, I believe its work!

import http from 'k6/http';

// use example function to generate data
import k6example from 'https://raw.githubusercontent.com/grafana/k6/master/examples/thresholds_readme_example.js';
export const options = { vus: 5, iterations: 10 };

function calculateStandardDeviation(values) {
  const mean = values.reduce((a, b) => a + b, 0) / values.length;
  const squaredDiffs = values.map(value => Math.pow(value - mean, 2));
  const variance = squaredDiffs.reduce((a, b) => a + b, 0) / values.length;
  return Math.sqrt(variance);
}

export function handleSummary(data) {
  console.log('Preparing the end-of-test summary...');

  // Example: Calculate standard deviation of HTTP request durations
  const requestDurations = data.metrics.http_req_duration.values; // metric to use
  const durationsArray = Object.values(requestDurations); // extract as array
  const stdDeviation = calculateStandardDeviation(durationsArray);

  console.log(`Standard Deviation of request durations: ${stdDeviation.toFixed(2)}ms`);

  // Send the results to some remote server or trigger a hook
  const resp = http.post('https://httpbin.test.k6.io/anything', JSON.stringify(data));
  if (resp.status != 200) {
    console.error('Could not send summary, got status ' + resp.status);
  }
}