Add link to kernel documentation for sysfs/cpufreq files
@@ -104,7 +104,8 @@ func (c *cpuCollector) updateCPUfreq(ch chan<- prometheus.Metric) error {
if _, err := os.Stat(filepath.Join(cpu, "cpufreq")); os.IsNotExist(err) {
log.Debugf("CPU %q is missing cpufreq", cpu)
} else {
- // cpufreq values are kHz, multiply by 1000 for hz
+ // sysfs cpufreq values are kHz, thus multiply by 1000 to export base units (hz).
+ // See https://www.kernel.org/doc/Documentation/cpu-freq/user-guide.txt
if value, err = readUintFromFile(filepath.Join(cpu, "cpufreq/scaling_cur_freq")); err != nil {
return err
}
