Hi, I just found this topic,
I face the same problem as John, such as those errors when syncing :
Nov 17 09:17:41 katello.example.com pulpcore-worker-7[3775518]: django.db.models.deletion.ProtectedError: ("Cannot delete some instances of model 'ReservedResource' because they are referenced through a protected foreign key: 'TaskReservedResource.resource'",>
Nov 17 09:17:42 katello.example.com pulpcore-api[3277945]: pulp [89e5995c-3b2b-437a-b367-4faf9c981c39]: - - [17/Nov/2021:09:17:42 +0000] "GET /pulp/api/v3/tasks/039e13b0-5a99-4f8c-9906-14818f48a8d6/ HTTP/1.1" 200 1411 "-" "OpenAPI-Generator/3.14.1/ruby"
The same hammer ping result with “katello_agent” as failed even though we’ve never used katello agent, and the same qpidd errors in the journal.
This message helped me Oracle Linux 8 Appstream sync fails - #9 by John_Beranek
But sadly I think you already know about it 