Our previous ticket  (https://issues.redhat.com/browse/RHCLOUD-21333) we filed to onboard content-sources into the gateway had a mistake.  It requested the local url of: 

content-sources-backend.content-sources-stage.svc.cluster.local:8000

but it should be:

content-sources-backend-service.content-sources-stage.svc.cluster.local:8000

This isn't causing any immediate problems anymore, but we realized we don't actually need the content-sources-backend at all and plan on deleting it.