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If you go to https://elemental.docs.rancher.com/channels#flavors in the docs, clicking “Source” Will take you to the dockerfile that is used to build that image in OBS. In terms of identifying packages that are built into a particular flavour, look for the

RUN zypper

section(s) of these files

base

is supposed to only contain the absolute minimum set of packages. You're supposed to build a custom image from it.