How accurately the event capture will be sent


I am thinking of using Sentry as user event tracking on the client side. Need to know which users got HTTP request error (Internal server error) and who they were. I am thinking of adding user info to an error object.
I need to know who got Internal server error very accurately because HTTP request error is related to charging the fee to users or not.

I know it sounds strange but I would like to know this usage is reliable or not.
Would anyone give your advice or insights?