node_exporter/example-rules.yml

groups:
  - name: example-node-exporter-rules
    rules:
      # The count of CPUs per node, useful for getting CPU time as a percent of total.
      - record: instance:node_cpus:count
        expr: count(node_cpu_seconds_total{mode="idle"}) without (cpu,mode)

      # CPU in use by CPU.
      - record: instance_cpu:node_cpu_seconds_not_idle:rate5m
        expr: sum(rate(node_cpu_seconds_total{mode!="idle"}[5m])) without (mode)

      # CPU in use by mode.
      - record: instance_mode:node_cpu_seconds:rate5m
        expr: sum(rate(node_cpu_seconds_total[5m])) without (cpu)

      # CPU in use ratio.
      - record: instance:node_cpu_utilization:ratio
        expr: sum(instance_mode:node_cpu_seconds:rate5m{mode!="idle"}) without (mode) / instance:node_cpus:count