Is there an official "label registry" for (transaction) metadata?

CIP 10 proposed such a registry, but I can not find it implemented anywhere.

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There has been a lot of reorganization on the CIP website and for whatever reason a number of links seem to have been broken.

The registry as I understand it is this chunk of JSON in the CIP GitHub, permalinked below for convenience.

My understanding is that new labels are added via pull-request to this repo.

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