code: def find_usage(self):
          
          logger.debug("Checking usage for service %s", self.service_name)
          self.connect_resource()
          for lim in self.limits.values():
              lim._reset_usage()
          count = 0
          for bkt in self.resource_conn.buckets.all():
              count += 1
          self.limits['Buckets']._add_current_usage(
              count, aws_type='AWS::S3::Bucket'
          )
          self._have_usage = True
          logger.debug("Done checking usage.")
docs: Determine the current usage for each limit of this service,
          and update corresponding Limit via
          :py:meth:`~.AwsLimit._add_current_usage`.