I work in AdTech too. I'm still looking for a perfect counter solution. The counter we are using always overrun (which is better than up/down/up/down). We still manage to hack it by patching the number periodically.
p.s. I am working in an Ad Network but not plugging into exchange. Our system is not capable for that.
p.s. I am working in an Ad Network but not plugging into exchange. Our system is not capable for that.