Collections of the form https://www.ibiblio.org/example_collection/ that do not have their own dedicated backend depend on infrastructure that is currently not meeting capacity requirements. We are working to resolve this as quickly as possible. A significant fraction of our web collections are impacted.
After significant work, we have narrowed the scope of the problem to a subset of collections that were previously relying on PHP <= 7.3, and we should have a resolution in place before 5p local time.
We believe this issue, which resulted in a significant fraction of php-based sites showing “Service Unavailable” rather than the collection, is now resolved. If you have a site hosted under the domain www.ibiblio.org and you see “Service Unavailable” when trying to view your collection, please reach out.