src/diagnostics/config/triage/cpu.triage

{
    // Appmgr samples total CPU and queuing time for all components it
    // knows about (v1 only) every minute.  The last two samples are retained
    // to calculate average CPU load over approximately the last minute.
    select: {
        // The total number of nanoseconds any component was scheduled
        // and running on a CPU in the second to most recent sample.
        prev_cpu: "INSPECT:core/appmgr:root/cpu_stats/recent_usage:previous_cpu_time",

        // The total number of nanoseconds any component was queued to
        // run, but was not actually running in the second to most recent sample.
        prev_queue: "INSPECT:core/appmgr:root/cpu_stats/recent_usage:previous_queue_time",

        // The timestamp of the second to most recent sample.
        prev_time: "INSPECT:core/appmgr:root/cpu_stats/recent_usage:previous_timestamp",

        // The total number of nanoseconds any component was scheduled
        // and running on a CPU in the most recent sample.
        current_cpu: "INSPECT:core/appmgr:root/cpu_stats/recent_usage:recent_cpu_time",

        // The total number of nanoseconds any component was queued to
        // run, but was not actually running in the most recent sample.
        current_queue: "INSPECT:core/appmgr:root/cpu_stats/recent_usage:recent_queue_time",

        // The timestamp of the most recent sample.
        current_time: "INSPECT:core/appmgr:root/cpu_stats/recent_usage:recent_timestamp",
    },
    eval: {
        // The average CPU and queue times during the two most recent samples in
        // appmgr (typically every minute). This includes only CPU time for
        // components known to appmgr (v1 components). The percentage is out
        // of the total CPU time available on a single processor, so on a 4
        // core system the percentage can go up to 400%.
        cpu_average: "(current_cpu - prev_cpu) / (current_time - prev_time)",
        queue_average: "(current_queue - prev_queue) / (current_time - prev_time)",
    },
    act: {
        v1_component_cpu_usage: {
            type: "Gauge",
            value: "cpu_average",
            format: "percentage",
        },
        v1_component_queue_average: {
            type: "Gauge",
            value: "queue_average",
            format: "percentage",
        },
    },
}