Is it possible to monitor Domain Controllers and DHCP servers on Windows?
I understand there was a user creation conflict problem prior to OneAgent v1.145.
Is it now supported with latest version and if so where can I find documentation on the details?
Oneagent won't help you much on monitoring DHCP or other window services. You can use just process monitoring (if you can identify the particular process, some of the windows processes have unfortunately the same process name, thus you won't be able to distinguish them).
You can also use Oneagent plugins to fetch the information you need (for example from perfmon).
For these core windows services, deep monitoring is not an option, since they cannot be instrumented. Running oneagent in cloud infrastructure mode is sufficient in this case unless you run some processes where deep monitoring is possible and required.