Comment # 14 on bug 1200710 from Antonio Feijoo

(In reply to Michal Suchanek from comment #13)
> How is kmod responsible for missing sysctl?
> 
> Whatever installs modprobe configuration that depends on sysctl should also
> install a dracut module that pulls it into initramfs.

Thanks for pointing me in the right direction. This issue was recently added by
nfs-utils:

https://build.opensuse.org/package/view_file/openSUSE:Factory/nfs-utils/0001-systemd-Apply-all-sysctl-settings-when-NFS-related-m.patch?expand=1