I'm pretty sure this warning is occurring because I got lazy and made all devices available to a dashboard.
How do I determine which device is causing the error?
Look through all of your authorized devices and see which has a (long) eventStream attribute value under "Currret States." This will be easier if you scope the devices to just the ones needed for that Dashboard and see if the log entry disappears on its own. (This is a good idea for performance anyway.)
Or you can look through your custom driver code for one that has attribute "eventStream" and check just the devices that use those or hope someone here knows or wrote such a driver and can tell you, which could also narrow down the search. 
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Appears it's @tomw UniFi Controller driver.
I removed it from every Dashboard. Hopefully that does the trick.
Thanks!
