Hello, I recently installed pi-hole. It is a great tool to not only block unwanted content, but gives some great insight into your network that goes otherwise unnoticed. I have a single Hubitat devices on my network and I am seeing the error "Maximum number of concurrent DNS queries reached". This is the only device throwing this warning - everything else looks good. Could anyone help me understand the message and if/what may be done to address it? Thanks so much in advance for any guidance here.
Did you read that link from the screenshot "Check out our documentation ..."?
Check the DNS Queries it has been sending to your Pi-Hole and you might find out what is causing all this let’s say “DNS SPAM” 
Thanks nero, I will look at the Queries and see if I can narrow down the culprit.
I have two Hubitat's and only once have I seen it frenzy and that was with a cloud service app I added that I no longer use. Come over to the Hubitat forum and we can help you out.
I added the domain name that seemed to be causing the issue to my “allowed” list and things have quieted down. Thanks for the feedback, greatly appreciated.
Can you provide the domain name that you allowed? I want to check my pi’s. My hubitat’s DNS lookups have been quiet in the last 9 months.
Sure it is: service.cloud.hubitat.com
Sounds like some kind of “Phone Home” thing you should take a deeper look at : Is it just for checking updates or some kind of Telemetry ?!
I only have 4 queries to it in 4 days. And only my cloud service box vs my local services box. That endpoint I think is used for doing cloud backups and checking if there is newer firmware. But at least you have this resolved to keep it from frenzying again.