Plausible use cases:
- Copy announcements in some other system into Phabricator for greater visibility.
- Publish deployment / test / release state held in some other system to a panel to make it easier to see everything in one place.
We have a MOTD panel that we'd like to update programmatically. We also have other panels we'd like to implement that would be useful to have programmatic access to ("List what's currently broken" or "Can we do deploys?")