code: function Monitor (opt) {
    opt = opt || {};
    this.prefix = opt.prefix || process.env.MONITOR_PREFIX || null;
    this.host = opt.host || process.env.DATADOG_HOST;
    this.port = opt.port || process.env.DATADOG_PORT;
    this.interval = opt.interval || process.env.MONITOR_INTERVAL;
    if (this.host && this.port) {
      this.client = new StatsD(this.host, this.port);
      this.socketsMonitor = new SocketsMonitor(this);
    }
  }
docs: Monitoring and reporting.
  @class
  @param {object} opt Monitor options.
  @param {string} [opt.prefix] User defined event prefix.
  @param {string} [opt.host] Datadog host.
  @param {string} [opt.port] Datadog port.
  @param {string} [opt.interval] Sockets Monitor stats poll interval