feat(aws): Add ProviderSpecific option to disable A/AAAA Alias record creation for Route53 #5815
Description
What would you like to be added:
Introduce new ProviderSpecific options for the Route53 provider, such as:
aws/alias-disable-aaaa: "true" (disable AAAA Alias creation, only create A Alias record)
aws/alias-disable-a: "true" (disable AAAA Alias creation, only create AAAA Alias record)
By default, external-dns creates both A and AAAA Alias records. With these options, users could selectively disable either record type on a per-record basis.
Why is this needed:
Currently, the only way to prevent AAAA records is --exclude-record-types=AAAA, which disables them globally.
In real-world scenarios, users may want finer control:
- IPv4-only backends (disable AAAA for specific records)
- IPv6-only services (disable A for specific records)
- Phased migrations where only one protocol family should be exposed
A ProviderSpecific option avoids the need for manual DNS adjustments and keeps external-dns as the single source of truth.
If maintainers agree with this direction, I would be happy to work on a PR to implement it.