Hi, please refer to the WING-MIB.mib file that you can find inside the firmware zip package for your controller.
The OIDs are described in the file.
RF Q is available per RF domain, but it will list Q index for each radio in that domain.
wingStatsRfdWlRadioStatQIndex
.1.3.6.1.4.1.388.50.1.4.3.2.9.1.1.21
list of offline APs:
wingStatsNocDevTable
.1.3.6.1.4.1.388.50.1.4.1.2
or
wingStatsNocDevOffLineInfoTable
.1.3.6.1.4.1.388.50.1.4.1.14.1
all of this info is also available via REST API introduced in 5.9.2