Linux Load Average
In its most basic form, the load average is basically the number of running processes on the server.
The numbers are show the averages based on 3 time intervals of last 1 min, 5 mins, and 15 mins.
For example, if there is a load average of 1, there is basically 1 process running on 1 CPU.
Ideally, the load average should be below the number of CPUs available to the system.