A simple understanding of Linux cpu usage load average

In Linux, the cpu usage load average is a simple understanding. Generally, the load average can be observed through top or uptime. The format is as follows: load average: 0.10, 0.05, 0.58 represents the last minute, respectively, 5 minutes, 15 minutes average CPU load if it is a single core CPU, 1.00 indicates that the CPU is full, if it is a multi-core CPU, when the load average reaches the number of CPU cores, it indicates that the CPU is fully loaded. If multiple physical CPUs are used, when the load average reaches the total number of physical CPU cores, the system CPU is fully loaded. In short, the number of CPU cores is the basis for measuring the CPU load based on the load average. So when the CPU load reaches what value should we pay attention? According to the reference article, the empirical value is that the number of CPU cores minus 0.3, that is, if the total number of CPU cores is 4, when the value of 15 minutes on the load average reaches 3.7, we should have a good look at the system.