Is Unbound still doing a complete restart somehow in 21.1 - like in 20.7?
I had great challenges with this in 20.7: https://forum.opnsense.org/index.php?topic=20356.msg94492#msg94492 (https://forum.opnsense.org/index.php?topic=20356.msg94492#msg94492)
And I just enabled Unbound again, and I still get the same behavior...?
So the answer is still YES, it does HUP all the time and is therefor far from optimal in my environment. Wonder if I need to wait another 6 months for 21.7 to see if it will still fail....
What are you using in its place? I had the same issue updating to 20.7.4. It caused a mess. I finally switched to dnsmasq. I have been reluctant to update or go back to unbound. I'm kind of in limbo waiting for an all clear.
I am using DNSCrypt-Proxy with a special hack to use my own blacklists which is not supported by the GUI.