borked

was it just your domain that was affected? If the zone file became corrupted then it would affect every zone on the file, not just yours.

I've never heard of MySQL DNS, which imo would be kinda dumb, but text files certainly can become corrupted - it takes time to open and lock a file for writing. It's a small amount of time, but it's finite, therefore corruption could occur if one call locked the file before the other could (and there was no error checking) or a race condition existed. It's a small chance, but possible.

Noone's to blame, unless of course the DNS service guaranteed uptime, which would be kinda dumb.

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(consider figuring out the email as test #1)