DNS, DHCP, other services cant be polled Unless its a domain admin account.
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It's possible, but it's very tricky and most people just throw their hands up and go with domain admin.
That said, one of my previous jobs had a fanatically scrupulous AD admin, and he helped me figure out the exact rights the domain account would need in order to collect WMI information from a DC.
I can try to dredge up those notes, but it was 6 years ago. Let me know if that's something you desperately need, or if it's something you just would like to have.
Rather than Domain Admin, I recommend using the Orion Agent since it doesn't require any elevated privileges.
If you cannot use the agent for any reason on your domain controller, you can start with this article:
