Load Testing 6000+ users?

Question

stress testing

Good day to all, the question is as follows, I need to load test with a load of 6000 ++ users on a server-oriented WinApi application (it was written in Delphi) that has a connection to Oracle DB. I would like to know how best to do such a load, and whether anyone had practice. I tried to do everything through Load Runner, but as I understand it, you can’t write a script in Vugen, because there is no protocol by which you can write WinApi and there is still no web interface, after which I used UFT Function Testing to write the script. But the script was written using UFT , does not give the metrics that are needed (((( Mb what else is there?. I will be very grateful for the help. :yu: