The extension.json file needs a license (see COPYING in the root dir) to it, and also a message key for the description of the "extension"... Along with the loading of the extension message files which should probably be created at the same time.
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Should I simply add the GNU licence from COPYING in root directory to extension,json ?
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Change 354174 had a related patch set uploaded (by MtDu; owner: MtDu):
[mediawiki/extensions/WikimediaMaintenance@master] Add license, description message and create and load i18n messages
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@Reedy, this has been pending for like 3 months now. Want to have a look? https://gerrit.wikimedia.org/r/#/c/354174/