everyone will tell you something different. for knock, you should log feedback knock, fine learning knock, and dynamic advance multiplier (DAM). i'm not an expert on this stuff so take the following with a grain of salt:
feedback knock- instantaneous knock picked up by your knock sensor
fine learning knock- ecu learned from previous knock events and stores these values to pull timing at the same load/rpm. this will prevent feedback knock which is why you need to log both!
dam- should be 1 on dbw throttle cars. think this is a way the ecu scales timing, possibly across all rpm/load conditions? this is thought of as a general way to determine engine health with respect to knock.
gosh, i sound like a noob here too, but i promise i've been playing with this stuff for a while.
i usually throw in boost, boost target, intake air temp, MAF, and probably a couple other things i'm forgetting.