code: func NewDeviceStatisticsNamespace(db *Lowlevel, device string) *NamespacedKV {
  	return NewNamespacedKV(db, string(KeyTypeDeviceStatistic)+device)
  }
docs: // Well known namespaces that can be instantiated without knowing the key
  // details.
  // NewDeviceStatisticsNamespace creates a KV namespace for device statistics
  // for the given device.