code: def _transform_value(self, instance, counter_id, value):
          
          i_key = self._instance_key(instance)
          try:
              metadata = self.metadata_cache.get_metadata(i_key, counter_id)
              if metadata["unit"] == "percent":
                  return float(value) / 100
          except MetadataNotFoundError:
              pass
  
          # Defaults to return the value without transformation
          return value
docs: Given the counter_id, look up for the metrics metadata to check the vsphere
          type of the counter and apply pre-reporting transformation if needed.