perl-Bootloader, the package handling our boot loader setup for nearly fifty years now, is going bye-bye.
As we are consolidating on grub2 it's no longer necessary to keep such a huge library around.
Instead, there are now small shell scripts in /usr/lib/bootloader/ that are used to keep the update-bootloader and bootloader_entry scripts working.
yast2 will work on the grub2 config files directly and not be using perl-Bootloader any longer.
That said, all the old code is still there for compatibility and will in fact be used to configure any bootloader != grub2. But the idea is of course to stop maintaining this code and eventually to get rid of it.
The new package (version 0.900) is on its way into Tumbleweed and will spread from there to SLE12-SP2 and Leap.
If you are using the perl-Bootloader library in your package, now is a good moment to panic.