White screen, 500, or a critical error after an update.
The debug log names the plugin or the theme. We do not reinstall WordPress as the first step, and we do not rewrite the theme.
PHP, the database, or a plugin
A fatal in the log after a plugin or PHP bump. That plugin is disabled from the files, not from wp-admin, which is already down. The others stay.
MariaDB down, wrong password, or the name missing after a move. That is the database page if the daemon is stopped. Here it is the config file if the daemon is up.
A theme function, a memory limit, opcache holding a deleted file. We raise the limit only if the log says it was exhausted. A reload comes before a memory guess.
A broken layout is not a server fault
If the HTML returns 200 and the CSS is wrong, that is the theme. We will say so in the first look. Malware that looks like a random outage is handed to the cleanup page, not patched in place.
€55 an hour. Site down is emergency, if someone is free.
Minimum 1 hour. Emergency €95, subject to availability. A plugin we disable stays disabled until you replace it. We do not write the replacement.
Critical error after an update?
Tell us what changed and the PHP version. No admin password in the first message.