Yellow Abdomen Micro Wasp

Size 2.5mm generously estimated. The tiny wasp was found on our ruccola lettuce, seemingly sunbathing on top of a tiny leaf. I didn't see any of its colleagues. It then vanished into what looked like a spider web the engulfed the flower. Quite frankly, I am not even sure on order level, whether this is actually a wasp. It has a very narrow waist, pointed abdomen, antennae. It looked dark, but on careful observation one can see that the abdomen is bright yellow and has a segmented structure. Eyes are big with occelli present.