Unfortunately I can’t tell what the exact reason was, but as far as I know, a pull is any GET .*/manifest/.* request, except that for multi-arch images 1 request contains one on the index and one on the platform specific manifest so basically 20 requests would be 10 pulls.
There is a different approach used for the Dashboard however, but since it is not real-time, it is not used for rate limiting. In the future Docker might have a better approach for rate limiting as they are working on improving Docker Hub.
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