/usr/lib/systemd/system-generators/systemd-bless-boot-generator
systemd-bless-boot-generator is a generator that pulls systemd-bless-boot.service into the initial boot transaction when boot counting, as implemented by systemd-boot(7), is enabled.
systemd-bless-boot-generator implements systemd.generator(7).
systemd(1), systemd-bless-boot.service(8), systemd-boot(7)