After upgrading from DSM 6.2 Update 3 to DSM 7.1.0-42661 Update 2 I see that there are some failing systemd services:
root@test4:~# systemctl list-units --state failed
UNIT LOAD ACTIVE SUB DESCRIPTION
● syno-oob-check-status.service loaded failed failed Out of Band Management Status Check
● synoindex-checkpackage.service loaded failed failed synoindex check if there are any synoindex-related packages
● SynoInitEth.service loaded failed failed Adjus