CPU 100%

 PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 8580 entrelac  20   0  656996  69096  15876 R 100.0  0.2   0:47.43 php-fpm
 7370 entrelac  20   0  657008  70996  16640 R  96.6  0.2   1:49.46 php-fpm
 8113 oitavob   20   0  677780  91368  16432 R  65.5  0.3   1:12.82 php-fpm
 6932 multiges  20   0  548436  70708  14548 R  62.1  0.2   1:34.02 php-fpm
 8969 pousadal  20   0  536020  56268  13740 R  62.1  0.2   0:06.55 php-fpm


Guys, everything was fine, two days ago it started to say 100 CPU, what could it be? What will be the problem.
Can you help me please

They are light sites, they don't have more than 500 visits per month

Is it always the entrelac user? Try monitoring in real time with htop or with Netdata.

Check access_logs:
/usr/local/apache/domlogs/
of the websites associated with the user "entrelac". It will help you to understand if the site is under attack or there are some "heavy" requests or the site is bombarded by some bot and then act accordingly.

Additionally. it will be good idea to check "server-status":
https://forum.centos-webpanel.com/i-can-build-it/apache-status-accesses/msg48966/?topicseen#msg48966

Who wants to bet it's some type of crypto script they are running?

Do you see a lot of that? I've never encountered it, personally. Usually just heavy scripts (poorly coded WP themes/extensions, Magento installations) or users with overly zealous cron scripts that consume a lot of CPU when they run -- and they are running them needlessly often for their traffic levels.

Sadly, yes.

They usually bring down the whole server.

Perchaps perfctl?
https://arstechnica.com/security/2024/10/persistent-stealthy-linux-malware-has-infected-thousands-since-2021/