Ear Tube Drainage

I’m not sure if this is the right place to post this. For those of you with kids with ear tubes, how much drainage is normal?

When we had Bryce’s tubes placed we were told we would see drainage. I actually didn’t see any drainage until about four weeks ago. Since then there has been a constant drainage out of his left ear. It doesn’t seem to bother him at all and he hasn’t had any fevers or anything else. The drainage has kind of a yucky smell to it. Is this normal with tubes? Or should I maybe call our Ped. ENT?

Thanks for any advice.