Man pages matching name systemd-run-generator in section 8:

systemd-run-generator.8.en	debian 10 / systemd
systemd-run-generator.8.de	debian 11 / manpages-de
systemd-run-generator.8.en	debian 11 / systemd
systemd-run-generator.8.de	debian 12 / manpages-de
systemd-run-generator.8.en	debian 12 / systemd