pfSense

I had this setting configured to 3 for a while to match suggestion in unbound documentation, then by accident noticed yesterday, this generates an error on the console in pfSense note this only appeared in the console, not anywhere in the logs GUI.
The error was timestamping is not supported on this platform, I then raised a query on the unbound github for confirmation and the dev confirmed it is Linux only implementation and has updated the documentation.
However unexpectedly he also changed the code to support it on FreeBSD as well, but of course this was only done in last few days so wont be on the unbound binary shipped with pfSense.

Link to my query here.

https://github.com/NLnetLabs/unbound/issues/1300

So the option either needs hiding from the GUI, or Unbound updated to that very new build. If its removed, and I remember, when pfSense finally updates to the supported build I will put in a request to add the option again.

Configuring the option is not terminal, is just a warning generated.