Still trying to figure out my website outages.
To recap: I have two #MediaWiki wikis and one #WordPress site. And there seems to be _some_ background process which starts soon after 23:00 UTC (or 24:00 in France, where the servers are located) which puts such a strain on the website that I get a lot of "504" errors for a few hours. The exact duration is variable - sometimes it lasts for one or two hours, and sometimes it lasts way into the morning. But I cannot identify what causes it from the Apache logs - there is no clear, consistent trigger to be found there.
Last time I asked customer support, they suggested that I check my plugins and background processes. But I don't know enough about website administration to know where to look.
For what it's worth, my WordPress website uses the following plugins (all updated to the latest versions):
ActivityPub
Contact Form 7
Include Mastodon Feed
JM Twitter Cards
Leaflet Map
MC4WP: Mailchimp for WordPress
TablePress
WP DSGVO Tools (GDPR)
The site is here:
https://sunkencastles.com/
The extensions on my wiki can be found here:
https://wiki.sunkencastles.com/wiki/Special:Version
Does _anyone_ have any idea what kinds of background processes on MediaWiki or WordPress might cause this kind of outage, and how I could check it?