app.js

var PORT = 8181,
    STATSD_HOST = "0.0.0.0",
    STATSD_PORT = 8125;

var express = require('express'),
    dgram = require('dgram'),
    socket = dgram.createSocket('udp4'),
    app = express(),
    msg;

app.get('/', function (request, response) {
  request.query.stat.forEach(function (item) {
    msg = new Buffer(item);
    socket.send(msg, 0, msg.length, STATSD_PORT, STATSD_HOST);
  });
  response.end();
});

app.listen(PORT);
console.log("Listening on port " + PORT);

so is the url ?stat=____ then