code: func (c *nfsdCollector) updateNFSdThreadsStats(ch chan<- prometheus.Metric, s *nfs.Threads) {
  	ch <- prometheus.MustNewConstMetric(
  		prometheus.NewDesc(
  			prometheus.BuildFQName(namespace, nfsdSubsystem, "server_threads"),
  			"Total number of NFSd kernel threads that are running.",
  			nil,
  			nil,
  		),
  		prometheus.GaugeValue,
  		float64(s.Threads))
  }
docs: // updateNFSdThreadsStats collects statistics for kernel server threads.