Upgrade from UCS 5.0.1 to UCS 5.0.2

right now I upgraded two UCS servers from UCS 5.0.1 to UCS 5.0.2.
Finally, it worked.
The domain controller was upgraded without any problem. But two things I observed with the backup (second) domain controller (maybe it is interesting for somebody else).
First: The backup domain controller showed an error because of a lack of space in /boot. Normally the system diagnosis shows this as a warning - but it did not show any warning before upgrading. After “sudo apt autoremove” the upgrade was able to start and finished successfully.
Second: After upgrading the system diagnosis showed an error because of a domain join problem. But there was the suggestion for rerunning the joining scripts. I started the scripts by clicking the buttons and the backup server rejoined the domain successfully.