https://xenforo.com/community/threads/developer-tool-new-event-listener-app_pre_setup-ability-to-group-data-registry-entries-to-fetch.187255/
At the moment, there is no way to tell XF2 to group a bunch of data registry entries into a single query. This means that if you have multiple add-ons...
developer toolevent listenernewapppre