I was just about to give the same example. I’m more familiar with GCP’s DNS, but I don’t see a place for structured metadata in Route 53 either. https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGui...

If you look through the octoDNS providers there's a number of cases where extra info is stored for "dynamic" records. The metadata is often things like the pool name or rule number. In other cases it's details about the health check config/version. The extra info is sometimes stored into a "notes" field, other times it's encoded into the ID or similar.

It's true that nothing extra is needed for simple/standard records, but once you start doing GeoDNS, failover, health check, etc. it's required.

In all cases thus far we've been able to find a way to store/indicate whatever we need.

(maintainer of octoDNS)

Why do I need metadata along with my A record? It either exists or it doesn't. That is the state required for Terraform.

The article explicitly mentions OctoDNS as a stateless configuration management system for DNS as a good solution.

To know if it’s managed by TF or not, to know whether or not to delete it. Exactly what’s being described.

That's what TXT records are for:

https://en.m.wikipedia.org/wiki/TXT_record

Terraform can be used to manage TXT records too. Where does it store metadata for them? Or is it TXT all the way down?

You can have multiple TXT records for a given domain name, so it would be possible to store an arbitrary amount of metadata for whatever systems you desire, and just loop through the TXT records to figure out which ones are for the current system's purpose.

Exposed to the world?

I guess that's not ideal, though I'm not clear what attack surface area is increased by storing creation/ deletion metadata in public.

I guess it lets an attacker know that you're using Terraform, which might help them target their attacks.

Terraform stores secrets in state. Generated database password, etc.

Oh, gotcha. I've not used Terraform yet.

Yes, if that's the case, then TXT records could easily be unsuitable. Depends exactly what metadata needs to be attached to your DNS records.