How much does Plagg know about Adrien's origins?

I was recently thinking about the possibility of adrien discovering he's a sentibeing by himself and then asking Plagg about it, but i suddenly realised i'm not sure how much Plagg even knows

He obviously wasn't present when Adrien was created, he never has much interaction with Gabriel, he wasn't there during representation and its not something that is really brought up during the fight with Monarch or when Gabriel is making his wish.

So does Plagg know? Have I forgotton something that would imply or prove that he does know?

The only ways I can think of is if kwamis really are some kind of all knowing entities, i know some people believe this about Tikki but I'm not sure I believe it myself. Or just if Tikki or Marinette told Plagg at some point. Maybe with the intent of having him make sure Adrien doesn't lose or break the ring.

What does everyone think?