I said IAM, not IAT(intake air temp)....Mostly for those people reading this that don't use cobb. IAM is DAM for open source people. Don't log independently, just add it to your log parameters(you know you can log multiple parameters at once to file).
If you just want to know if you're knocking at all, or in the recent past, log FLKC and DAM. If you only log FLKC, you could very well have 0 all across the board but your DAM could be <1, which means you had significant knock in the past and the ecu is fractioning your total ignition down so that you don't have any more learned knock. That's still a bad situation even if your FLKC is all 0's.