The first half of the posted list are the ramdisk artifacts corresponding to now-retired bugfix branches. I could see an argument being made that we should continue providing those deliverables, as we do on PyPI -- I am OK with deleting them even with that in mind, as they contain massively out of date software (beyond IPA) that is likely unfit for running on production servers anymore. These are potential targets for movement to a deprecated location instead of deletion, if we feel we should continue providing them.
The second half of the list are extra dangerous; they are advertised as builds from "master" branch, but they are very old and out of date due to us no longer creating images for those distributions or using those tools anymore. The CoreOS images mentioned are from 2016, to put this in perspective. These should be deleted IMO, even if we find a softer way for the retired bugfix branch ramdisks.
To be frank, if someone *is* consuming these old images, and deleting them forced them to make a support contact with upstream, it'd likely end up with a better solution for them overall than running years-old software on their bare metal.
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Jay Faulkner
Ironic PTL
TC Member