traceapm/src/middleware.js

SDK for OpenTelemetry auto-instrumentation and OTLP export for Node.js apps.

const { recordHttpRequestDuration } = require('./metrics');

function apmHttpMetricsMiddleware(req, res, next) {
  const start = process.hrtime();
  res.on('finish', () => {
    const diff = process.hrtime(start);
    const durationMs = diff[0] * 1000 + diff[1] / 1e6;
    recordHttpRequestDuration(durationMs, {
      route: req.route ? req.route.path : req.path,
      status_code: res.statusCode,
      method: req.method,
    });
  });
  next();
}

module.exports = { apmHttpMetricsMiddleware };