I'm working on a central link preview service for Pixelfed Groups, eliminating the herd of elephants problem when a post contains a link
Instead of every Pixelfed server fetching that metadata themselves, they will request it from a single server endpoint that I will operate to reduce load on the origin
I understand this may not be ideal, so I do plan on allowing admins to define their own server endpoint, and will be publishing the source code for our implementation!