How to catch the original user from linked server

Hi folks,I have a linked server with security configured to use "Be made using this security context" option, setting a 'usrBlabla' user with high privileges. I know, this is a bad practice, but it's a legacy thing and I need to remove it.My goal here is to know which users (source) are using the linked server but via DMV's, I just have a usrBlabla login, not the original_login (client side).There is an easy way to discover this information?A possible approach is using a Profiler/Extended Events and filter TextData, searching for linked server calls (I think it's works but i wanna avoid tracing).I wanna know if there is another (and better) method...Version: SQL Server 2008R2 SP2 EEThanks!