help with log values

[kprog]

hello!
Can you clarify any doubt for me?
in the log of my C7 Z51..

The value of the Log called..
Air-Fuel ratio... is it a real and reliable value? (I don't have wideband)

and the Knock Retard Value. I assume it is from the knock sensor... I have a green bar... when it detects knock it turns red, and indicates the ignition delay applied...
Is that so? and is it a reliable value?

My car is tuned...
and I would like to know these things to continue observing when summer arrives and temperatures increase.
Anything else I should pay attention to?

I see that the KR bar barely detects a couple of knocks and I see that it corrects it with -2?..

Attached 2 logs

and a curiosity. How many ignition degrees is it usual to advance in your tuned? I know it depends a lot on everything! But it is to collect information.

I don't know these engines very well... in my tune I can see that they have shifted up to 10?... in other engines this is crazy... You always learn something new.3? kaki.hpllargo kaki.hpl

[kprog]

It seems like everyone is very busy on this forum.
It seems incredible to me that no one answers such simple questions for experienced users.

[GHuggins]

What it's showing you is commanded air fuel, not actual. You'll need a wideband for actual.

Knock can be a lot of things. It can be from injection getting too close to the fuel window, torque model, torque management, a few others I'm sure or knock.