code: function _defaultValues(payload) {
    if (!payload.host)  { payload.host = hostname; }
    if (!payload.time)  { payload.time = Math.round(new Date().getTime()/1000); }
    if (typeof payload.metric !== "undefined" && payload.metric !== null) {
      payload.metric_f = payload.metric;
      delete payload.metric;
    }
    return payload;
  }
docs: /* some friendly defaults for event,
  in case they went missing.