ping failing - if pulp3 is not enabled
1) Make sure your smart proxy does not have the "Pulp3" feature (you can disable in /etc/foreman-proxy/pulp3.yml, restart foreman-proxy and refresh the features on the smart proxy via UI)
curl -k http://localhost:3000/katello/api/ping
on your katello instance.
No pulp3 information on the ping, since its not enabled on the system.
Notice that the output shows "pulp3" with a status of fail