ExternalDNS with OCI Provider Creating Extra TXT Record with 'a-' Prefix

[jbesoto]

I'm currently using ExternalDNS version v0.13.5 with the Oracle Cloud Infrastructure (OCI) provider, and I'm experiencing an unusual issue. Specifically, ExternalDNS is creating an additional TXT record for each A record it creates, where the additional TXT record has an a- prefix on the hostname.

For example, for a Kubernetes service named nginx-test, it creates an A record for nginx-test.wlp.external-dns-test.com and two TXT records, one for nginx-test.wlp.external-dns-test.com and another for a-nginx-test.wlp.external-dns-test.com. Both TXT records are associated with the same Kubernetes service.

I verified that there are no duplicate services with the same name in different namespaces, no additional instances of ExternalDNS running, and no other configuration or template that could be causing the additional a- prefixed hostnames. Also, there are no automatic Ingress resources created for the LoadBalancer type services in the Kubernetes cluster.

Here are example logs from the ExternalDNS pod:

time="2023-08-03T15:05:42Z" level=info msg="{ Domain=nginx-test.wlp.external-dns-test.com RecordHash=<nil> IsProtected=<nil> Rdata=10.109.203.39 RrsetVersion=<nil> Rtype=A Ttl=300 Operation=ADD }"
time="2023-08-03T15:05:42Z" level=info msg="{ Domain=nginx-ignore.wlp.external-dns-test.com RecordHash=<nil> IsProtected=<nil> Rdata=10.98.32.77 RrsetVersion=<nil> Rtype=A Ttl=300 Operation=ADD }"
time="2023-08-03T15:05:42Z" level=info msg="{ Domain=nginx-test.wlp.external-dns-test.com RecordHash=<nil> IsProtected=<nil> Rdata=\"heritage=external-dns,external-dns/owner=default,external-dns/resource=service/wlp/nginx-test\" RrsetVersion=<nil> Rtype=TXT Ttl=300 Operation=ADD }"
time="2023-08-03T15:05:42Z" level=info msg="{ Domain=a-nginx-test.wlp.external-dns-test.com RecordHash=<nil> IsProtected=<nil> Rdata=\"heritage=external-dns,external-dns/owner=default,external-dns/resource=service/wlp/nginx-test\" RrsetVersion=<nil> Rtype=TXT Ttl=300 Operation=ADD }"
time="2023-08-03T15:05:42Z" level=info msg="{ Domain=nginx-ignore.wlp.external-dns-test.com RecordHash=<nil> IsProtected=<nil> Rdata=\"heritage=external-dns,external-dns/owner=default,external-dns/resource=service/wlp/nginx-ignore\" RrsetVersion=<nil> Rtype=TXT Ttl=300 Operation=ADD }"
time="2023-08-03T15:05:42Z" level=info msg="{ Domain=a-nginx-ignore.wlp.external-dns-test.com RecordHash=<nil> IsProtected=<nil> Rdata=\"heritage=external-dns,external-dns/owner=default,external-dns/resource=service/wlp/nginx-ignore\" RrsetVersion=<nil> Rtype=TXT Ttl=300 Operation=ADD }"

Any help or guidance to clarify this would be greatly appreciated.