How to monitor the load of a site on a vps?

Question

System administration

Tell me how to organize monitoring of the load of sites on vps, not page loading speed, but the amount of server resources consumed by each specific site.

Answer 1

If you want a ready-made solution and there is no way to run your own monitoring server:
www.zabber.ru
Or, run locally, for example, munin.
Or your question is how to monitor the resource consumption of a particular site, and not the entire server as a whole?
I see such a solution: each site is launched inside its own LXC container, after which we monitor the load on the system by each of these containers using Zabbix. Perhaps someone will offer an easier and more competent option.

Answer 2

Nagios

Answer 3

put a control panel in them, usually there is such an opportunity, in general it would be nice to divide everything into containers and monitor them, in the context of one web server this is usually done by some kind of module that can collect statistics on the load by domains

Answer 4

This is done in a couple of bash commands:
# install
apt-get install acct
# user statistics
sa -m