code: func NewEntropyCollector() (Collector, error) {
  	return &entropyCollector{
  		entropyAvail: prometheus.NewDesc(
  			prometheus.BuildFQName(namespace, "", "entropy_available_bits"),
  			"Bits of available entropy.",
  			nil, nil,
  		),
  	}, nil
  }
docs: // NewEntropyCollector returns a new Collector exposing entropy stats.