Make publishing of DNS record per pod optional for headless service

[dooman87]

Hi There,

We use external-dns to sync records to AWS Route 53 and we are running into some of the AWS limits. At the moment we have a headless service with external-dns annotation to create main A record. However, we've also noticed that external-dns creates record per each pod which creates records that we don't need, but also they contribute to some of the AWS limits. The problem only got worse once we started horizontally scale those pods :)

FWIU currently there is no flag or option to make that behavior optional, so I wanted to ask it that's the case then would opening a ticket make sense here. We'd also be happy to code contribute if required.