add user agent

@@ -95,7 +95,8 @@ module.exports = (req, res, next) => {
                                 type: durationType[item.tp]
                                 type: durationType[item.tp]
                             },
                             },
                             fields: {
                             fields: {
-                                duration: duration
+                                duration: duration,
+                                useragent: req.get('user-agent')
                             }
                             }
                         }));
                         }));
                     }
                     }