I think there's something wrong with the permission checks that matomo is doing here.
I've everything on http:http, with proper 755 on every folders and 644 on every files (like every other virtualhost that normally works on this server).
So, apache can read/write everything as it should be.
Php-fpm also runs on http user, so it shouldn't be a problem.
The strange part are the following warnings (sorry for the locale).
I can't understand why it can't write on those folders or wrongly report permissions on those files.
Hi @G4Zz0L1 what are the permissions on the symlinked directories?
Actually I've found out that the culprit it's the update to PHP 7.4.
The main cause it's the option
ProtectSystem of systemd, which cause the folders to go read-only.
I think we can close this, sorry for the trouble.
Glad you found out what the culprit was and thanks for letting us know about this @G4Zz0L1