Unfortunately perflib does not expose scope statistics
(DhcpServerv4ScopeStatistics), and WMI queries to this class don't
appear to be possible with the stackexchange/wmi module.
Perflib is used to collect base AD FS performance counters.
A subset of the total performance counters has been added, but more will
likely be added in the future.
Documentation for the AD FS counters is poor. As such, some counters
have been omitted until their nature can be interpreted.
Ben Reedy
Calle Pettersson
Ashok Siyani
Amit Saha