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Spring boot reports two statistics when Prometheus in place.

    # HELP system_cpu_usage The "recent cpu usage" for the whole system
    # TYPE system_cpu_usage gauge
    system_cpu_usage 0.029126213592233007
    
    # HELP process_cpu_usage The "recent cpu usage" for the Java Virtual Machine process
    # TYPE process_cpu_usage gauge
    process_cpu_usage 0.0

What is the difference between system_cpu_usage and process_cpu_usage ?

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As far as I understand,

system.cpu.usage is host’s cumulative CPU usage in nanoseconds this includes user, system, idle CPU modes. (the sum of the /proc/stat CPU line)

process.cpu.usage is the cpu usage for the JVM process aka CPU time used by the JVM process

CPU usage aka CPU time is measured by counting the seconds that a CPU spends processing instructions from an application or from OS.

Both metrics are of type Gauge because their values that can go up or down as their showing a resource usage .

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