I do not think this exists. But if it does please tell me where. If not this would be a wonderful feature to have.
All my endpoints are CentOS (6.9 and 7). When I perform yum updates via Katello no where do I see a list of what packages got updated. Yes I do know about the /var/log/yum.log file but most of the time its empty. I have never seen an update performed from the Katello GUI cause anything to be written to the yum.log.
It would be nice to see the packages that were updated either in the Katello GUI or a log somewhere.