code: function(dbName, collection, metric, callback) {
  	var colInfo = {capped:true, size:options.size*options.max, max:options.max};
  
  	database(dbName, function(err, db) {
  		if (err) {
  			db.close();
  			return callback(err);
  		};
  
  		db.createCollection(collection, colInfo, function(err, collClient) {      
  			collClient.insert(metric, function(err, data){
  				if (err) callback(err);
  				if (!err) callback(false, collection);
  			});
  		});
  	});
  }
docs: Insert the data to the database
  @method insert
  @param {String} database
  @param {String} collection
  @param {Object} metric
  @param {Function} callback