I have dealt with those annoying buggers for years, as harvest time coincides with my most highest activity brewing season, other than late spring.
But tonight took the cake...I went and drew a saison from the keezer, and two dead fruit flies poured out as well. I guess they crawled up inside the tap.
I have not seen that to date. Fished them out and am now drinking said saison, tastes fine. Dan Listermann taught me years ago, do not fear insects in your beer.