systemd-boot-check-no-failures.service, systemd-boot-check-no-failures — verify that the system booted up cleanly
systemd-boot-check-no-failures.service is a system service that checks whether the
system booted up successfully. This service implements a very minimal test only: whether there are any failed units on
the system. This service is disabled by default. When enabled, it is ordered before
boot-complete.target, thus ensuring the target cannot be reached when the system booted up
with failed services.
Note that due the simple nature of this check this service is probably not suitable for deployment in most
scenarios. It is primarily useful only as example for developing more fine-grained checks to order before