Node.js v1 カスタム・インスツルメンテーション（レガシー）

var nr = require('newrelic');
var app = require('http').createServer();
var io = require('socket.io')(app);

io.on('connection', function (socket) {
  socket.on('ping', nr.createWebTransaction('/websocket/ping', function (data) {
    socket.emit('pong');
    nr.endTransaction();
  }));
  socket.on('new-message', nr.createWebTransaction('/websocket/new-message', function (data) {
    addMessageToChat(data, function () {
      socket.emit('message-received');
      nr.endTransaction();
    });
  }));
});

var nr = require('newrelic');
var redis = require('redis').createClient();

setInterval(nr.createBackgroundTransaction('update:cache', function () {
  var newValue = someDataGenerator();

  redis.set('some:cache:key', newValue, function () {
    nr.endTransaction(); // End the transaction once redis is done
  });
}), 30000); // Every 30s

// Wrap the callback in a segment
db.createObject(nr.createTracer('db:createObject', function (err, result) {
  // Some error handler that will end the response for us
  if (util.handleError(err, res)) {
    return;
  }
  res.write(JSON.stringify(result.rows[0].id));
  res.write('\n');
  res.end();
}));

pg.connect(config.db_string, nr.createTracer('pg:connect', function (err, client, done) {
  if (util.handleError(err, '500', res)) {
    return done();
  }
  client.query('SELECT count(*) FROM test_count', nr.createTracer('pg:query', function (err, result) {
    if (util.handleError(err, '500', res)) {
      return done();
    }

    res.write(result.rows[0].count);
    res.write('\n');
  }));
}));