Logs that show size of upload

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Okay, so I think this is the way I would go:

  1. disable rolling release
  2. push a new release
  3. trigger delta between pinned release and latest. This can be done using the API call: https://delta.balena-cloud.com/api/v2/delta?src=<SRC_IMG>&dest=<DEST_IMG> where <SRC_IMG> is the source/pinned release image ID (or name) and <DEST_IMG> is the “latest” image.
  4. get update delta size using Camerons script (probably on some poll interval as the delta will take a minute or more to generate).

Your approach with a test device is also a pretty good way to go. Let me know if you need clarification on any of the above

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