https://bugs.launchpad.net/designate/+bug/1595265
> The limit on TXT data is now 255 bytes, which is too short for certain use cases. Designate should support creation of TXT records with data much longer than 255 bytes.
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Initially discovered in {T87338}
To reproduce the problem, I tried to make a TXT record called `designatetesting.testlabs.wmflabs.org.`, comment `Alex testing https://phabricator.wikimedia.org/T87338#4274206`, value `abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz`
Horizon through an HTTP 500 straight back at me and the UI showed "Error: Unable to create the record set.".
This was fine as soon as I reduced the value to 256 characters. More than that and it errored.