I'm still missing historical data of important wireless metrics like channel utilization per ap/channel and historical data for other statistics you could view in the EWC reports like "Wireless Statistics by APs" and "AP Performance Report by Radio". A historical report of channel utilization could help you to find out were you have or are close to wireless performance problem or maybe a non-WiFi interference source exists.
I've tried to create my own custom report in OneView, but i could not found the values I'am looking for. Hopefully next version of Extreme Control Center add more usefull features to the Wireless Tab making admins lifes more easy. Compared to competitor WNMS many things are still missing.
If I'm wrong, please tell me how can view the things I'am looking for.