AdminUI create every 5 seconds stats request and may crash on heavy server load
Steps to reproduce
The Admin UI updates stats counters in 5-second interval. However, if the individual requests need longer than 5 seconds, this causes the requests to jam and the Admin UI crashes.
Still needs to be merged forward to 3.x from 2.3.x branch, but setting fix version to include 3.3 on the assumption that this will happen.