Reload Nginx serivice instead of restaring it when reissuing Let's Encrypt certificate
When reissuing Let's Encrypt certificate for wildcard subdomain(*.example.com) Nginx is restarted, which causes downtime depending on the number of websites. For example, if the server hosts around 4000 domains this can cause 15 seconds downtime for each restart.
The suggestion is to reload the Nginx service and not to restart it.
In a test I could not verify that Nginx is restarted. Instead if reloads the configuration which does not cause a downtime. If you are still experiencing an issue with this, please open a ticket with Plesk support so that the issue can be investigated and fixed on your server.
-- PD
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Bernsteiner, Michael commented
If you ask me this is a bug and MUST be fixed ASAP!