Cool! I have a strange affinity for RSS and created* a small plugin to subscribe to feeds within Event-Driven Ansible** and run actions on new feed posts. I didn't create it with specific utility in mind, certificate monitoring via RSS fits right in there - much to my surprise.

* - https://github.com/cloin/cloin.eda/blob/main/docs/rss.rst

** - https://github.com/ansible/ansible-rulebook