We want 2 new entries in each registry entry:

• The runtime groupID, if present.
• The targets this ownerID wants present (remove the rootHost) only when groupID present.

For example, if a DNS Record with groupID: group1 has an endpoint of "host in CNAME 60 target1,target2". The resulting registry entry should be (alongside whatever current information is put into the registry) something like:

version=1;ownerID=sdfsdf;groupID=group1;targets=target1&&target2

In terms of implementation, before publish is called:

• https://github.com/Kuadrant/dns-operator/blob/main/internal/controller/dnsrecord_controller.go#L354
• https://github.com/Kuadrant/dns-operator/blob/main/internal/controller/remote_dnsrecord_controller.go#L211

We want something like

if groupID != "" {
   e.labels[group] = groupID
   e.labels[targets] = e.targets
} else {
   // clean up logic
}

unit test of usage: https://github.com/Kuadrant/dns-operator/blob/main/internal/external-dns/registry/txt_test.go#L190-L196

This will enable us to work out:

1. Which groups own a particular endpoint
2. Which groups own any particular target