Comment 1 for bug 1853635

I believe there is a hard-coded restriction on the per-file size to 64KiB:

https://docs.openstack.org/nova/latest/user/metadata.html#metadata-userdata

I'm trying to find where that is enforced though. But I don't think the quota matters in that case (though the config option should set a max value so operators don't think they can set the max to over that limit).