This hasn't been touched in a while. It's a fairly simple and well-isolated component that consists of only a single class.
As part of T269516#6702070, I made some improvements to it, after which I cleaned it up a bit.
This task is to track:
- Knowledge transfer about this class, and to sync up on best practices more generally (it makes for an easy demo case).
- Code review of the decoupling, documentatioon, and added test coverage.
The Pingback component is an EventLogging instrument that powers https://pingback.wmflabs.org/ which helps WMF understand how MediaWiki is used in the wild in terms of PHP, web server, and database support, etc.