What is the formula for calculating the load on the database?

Question

MySQL

Hello.
The goal is to display the total load on the database in the control panel .
Ideally, of course, I would also like to have the average number of requests to the database per second, the maximum number of requests, etc., but I did not find information on these data.
At the moment, I formed approximately the following formula:

$mysqlQueries = (int)DB::select('SHOW STATUS like \'Queries\'')[0]->Value;
$mysqlConnections = (int)DB::select('SHOW STATUS like \'Connections\'')[0]->Value;
$mysqlLoad = round((time() - strtotime('today')) / ($mysqlQueries / $mysqlConnections) / 100, 2);

Time in seconds since the start of the day divided by (total number of requests / total number of connections).
To bring it into a more or less understandable human form - rounding, and dividing by 100 (the figure turns out to be very large) .
How correct is the data when calculating using such a formula, and is there a better option for calculating?
Also interested in the above (average number of requests per second and the maximum number of requests).

Answer 1

It's all here.
You can just connect zabbix, it will show it.