refactor: adjust cpu's stats #1457
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Rationale
Only the total cpu usage is implicit if the numbers of cpus are different across the cluster nodes.
Detailed Changes
Introduce the
num_cpusin the system stats, and adjust the average cpu_usage to the sum of all the cpus' usage, whose range is[0.0, num_cpus].Test Plan
Add a new check to ensure the
cpu_usage's range to to be[0.0, num_cpus].