Let's Encrypt, 인증서 유효기간 90일에서 45일로 단축

Will this impact Discourse users?

iirc all the let’s encrypt clients have some kind of automation to check for certificates expiring in the next n days and automatically renewing them. So by that logic there shouldn’t be any impact.

is this done by a cron job, rather than a sidekiq task ?

Yes, it is handled by acme.sh which sets up its own cronjob.

Thanks all! Good to know