Finding The Actual Application User ID In The Transaction Logs
I want to be able to find out the application user who made the change, not the database user.


Then you're going to need to fundamentally change the way your application behaves in terms of security and auditing. You'll also need to setup some sort of auditing, either in the application or database.


  Is there a way that I can pass this actual user ID information as some kind of meta data so that it will be logged as well for each transaction?


No, the log was not meant to be a developer tool.