Metrics类型
# HELP node_cpu_seconds_total Seconds the cpus spent in each mode.
# TYPE node_cpu_seconds_total counter
node_cpu_seconds_total{cpu="0",mode="idle"} 927490.95
node_cpu_seconds_total{cpu="0",mode="iowait"} 27.74
...Counter:只增不减的计数器
Gauge:可增可减的仪表盘
to be continued
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