You want to track domain admin logins to a specific DC only?
In any case,
1. Enable the Directory Services query tool on the LEM appliance first
2. Create a User Defined Group for "Domain Admins"
You can then use this group to match the user account in your filters or correlation conditions (for rules)
You can find some screenshots in Figure 31 of this guide
If you need to restrict the filter or rule to a specific DC, simply drag the Detection IP event field into the filter / rule condition