Using CPI 2.2.0, sent a request to the WlanControllerDetail resource and get incorrect counts for dot11aClientCount and dot11bClientCount. For example, a response will report 134 dot11aClientCount and 241 dot11bClientCount when the GUI Summary page reports 2210 clients.
What's the model number and software version of the controller you're seeing this on.
It is a AIR-CT5508-K9 controller licensed for 500 APs, running 188.8.131.52.
The other error noticed are with the webacs/api/v1/data/Sites and webacs/api/v1/op/groups/sites queries. The apCount is almost always zero for buildings and floor areas that have many access points.
There does seem to be an issue here. If you query webacs/api/v1/data/ClientCounts?.full=true&key=<controllerIp> is that data correct.
A query to webacs/api/v1/data/ClientCounts?.full=true&key=<controllerIp> produces the correct number of clients.
We'll fix this issue in 3.0.