While I have your ear, are the indexer log urls different for libraries hosted on Gitlab?
From the FAQ they should be
http://downloads.arduino.cc/libraries/logs/<host>/<repository slug>/
I would expect that
https://gitlab.com/zaber-core-libs/zaber-ascii-for-arduino
would have indexer logs at
https://downloads.arduino.cc/libraries/logs/gitlab.com/zaber-core-libs/zaber-ascii-for-arduino
But this comes up empty