Been growing myself for quite a few years, and I let mine go to amber quite often if I'm far enough ahead of the game to wait...but have never seen that.
My unsure guess is it's either strain-dependant, or from an external source possibly. (untreated wood frame growbox dripping sap on the plants)

What I was thinking before, was that it might be a bit of dust absorbing the resin from surrounding globular heads, but with no cannabis smell it's obviously not that. Have you tried putting some on your meds and seeing what it tastes like when smoked? (just curious...not a recommendation)

Have you cut a branch to see if it ozzes the same stuff, or see if the sap turns amber? If it doesn't, it's unlikely to be cannabis sap.
If it were sap, wouldn't you be more likely to see more of it twords the inside portion of the bud, but not so much pooling (into drops) on the outside. (unless the plant is dripping on itself)

Perhaps a giant-spider pee-pool?

Wow...nice list of AN products. With AN...do you have to use ALL that stuff?