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DockerHub API Pull Count Issue


I think I’ve spotted an issue in the DockerHub API related to the “pullCount” in API responses. I’ve detailed it here on Twitter, but here’s the basic issue summarised:

  1. I’ve been tracking download counts (“pullCount”) from the API for images
  2. On March 8th between 1700 and 1800 UTC the pullCount for Alpine went from over 2 billion back down to 1.14 billion
  3. I have been tracking since December and this is the only time a count has gone down instead of up
  4. This is the only image this has occurred for
  5. It occurred close to where a typical 32 bit overflow could occur
  6. It has been increasing normally since it went down

Is this a bug in the DockerHub API? Can the pullCount be relied upon for data scraping and other uses?