Сегодня при перестройке Discourse в панели появилось:
precompile target: color_definitions (Base)
Done compiling CSS: 2020-10-12 04:16:38 UTC
Restarting unicorn pid: 56
Docker Manager: FAILED TO UPGRADE
#<Errno::ESRCH: No such process>
/var/www/.../lib/docker_manager/upgrader.rb:251:in `kill'