High upload with no traffic

Installed our first two a5c’s today. I see 100kbps to 800kbps on the upload graph, although there are no clients connected, and no actual ethernet traffic. This seems to be related to received noise. Both AP’s behave the same. Is this normal behavior?
Thank you.

That is just discovery and management traffic, just the APs doing their thing. Radios are chatty little buggers especially if you have them connected to Mimosa’s Cloud monitoring stuff.