So, we're self hosting our DNS forward and reverse zones, and are using our upstream - ISP as slaves.
Now, we've got a bunch of zones that have an identical SOA record.
I want to use an $INCLUDE for this SOA record, because it is completely redundant information, except for the serial.
Now the problem is, the serial would be identical for all zones, and whenever I change a single zone, I would increment the serial for all zones, thus triggering an unnecessary retransfer of all zones to the slaves.
Now, this is not much data, some KiB at most. Still, the question is, is this considered bad practice, given that the retransfer is unnecessary?
Any opinions on that? Should I just go for it?