#11 Add timestamp as object to emit function

models/ping.js

 var logger = require('fluent-logger');
 var mongoose = require('mongoose');
 var Schema   = mongoose.Schema;
-var LoggerFields = ['timestamp', 'isUp', 'isResponsive', 'time', 'tags', 'monitorName', 'downtime', 'error'];
+var LoggerFields = ['isUp', 'isResponsive', 'time', 'tags', 'monitorName', 'downtime', 'error'];
 
 mongoose.Promise = global.Promise;
 logger.configure('app.uptime', {
@@ -72,7 +72,7 @@ Ping.statics.createForCheck = function(status, timestamp, time, check, monitorNa
       log_output[name] = String(value);
     }
   }
-  logger.emit('ping', log_output);
+  logger.emit('ping', log_output, timestamp);
   ping.save(function(err1) {
     if (err1) return callback(err1);
     check.setLastTest(status, timestamp, error);