Thanks for the fix, according to the changes you made, the loadbalancing exporter should work correctly (even without your fix), when using the standard <svcName>.<namespace> domain name format of the headless service. I am still experiencing the same issue even when using the collector-backend.default in the config mentioned in the issue. Am I missing something here? Thanks!

Let me retest with that and see if I missed something during the fix.

I just reran with the provided config against a local kind cluster using a collector build that includes the FQDN parsing fix. With telemetrygen driving 50 traces through a port-forward, both backend pods received traffic and kubectl logs deploy/lb-collector never produced the couldn’t find the exporter for the endpoint "" error. So, I think, <svc>.<namespace> now works as expected.

The front collector’s service account must be allowed to list/watch endpointslices in the namespace. Without the RBAC role binding, the informer never populates and the ring stays empty, which yields the same error message even with a correct service string.