What are the tools for monitoring the operation of the server and the site (RPM, RAM, uniques, queries to the database, ..)?

Question

Monitoring

I saw posts where bearded labor admins and programmers look at beautiful graphics and say, for example:

• in the last month the number of users increased by 10%
  
• the site easily holds 1000 requests per second, by the evening the load increases
  
• our database holds max X requests. it's a bottleneck
  
• we are ddosed
  
• we have, on average, 100 uniques per day
  
• ...
  

Are there any tools that allow you to view the dynamics and current state: RPM, memory consumption, number of uniques, number of views, ...? How does this even happen? And how can you test it?

Answer 1

First you install Zabbix, and then you learn how to monitor the service (for example, if a website serves nginx, then you look for "plugins" on zabbix. Another moment is when the application itself (website, frontend / backend) writes logs or leaks information about its zabbix
nginx templates

Answer 2

Cooler RPM, CPU temperature, RAM and other performance can be tracked in 10-Strike Network Monitor Pro. It also makes queries to the database, but does not measure the performance of the database itself - only what the query returns. Views, uniques are logs to parse. Didn't seem to see it there.