How to check who logged on using root



So I'm in a domain I can check who logged into my apache using root if the person used a windows station to logon because all the windows stations r in the domain. But if someone uses his Linux workstation to logon to my apache using root how can i check which user was it in his server?
-i do not have user in his server but theres simm server collecting all data if it matters.
how can i know who's the one that logged on using root ?

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