code: def _find_usage_clusters(self):
          
          count = 0
          fargate_task_count = 0
          paginator = self.conn.get_paginator('list_clusters')
          for page in paginator.paginate():
              for cluster_arn in page['clusterArns']:
                  count += 1
                  resp = self.conn.describe_clusters(
                      clusters=[cluster_arn], include=['STATISTICS']
                  )
                  cluster = resp['clusters'][0]
                  self.limits[
                      'Container Instances per Cluster'
                  ]._add_current_usage(
                      cluster['registeredContainerInstancesCount'],
                      aws_type='AWS::ECS::ContainerInstance',
                      resource_id=cluster['clusterName']
                  )
                  self.limits['Services per Cluster']._add_current_usage(
                      cluster['activeServicesCount'],
                      aws_type='AWS::ECS::Service',
                      resource_id=cluster['clusterName']
                  )
                  # Note: 'statistics' is not always present in API responses,
                  # even if requested. As far as I can tell, it's omitted if
                  # a cluster has no Fargate tasks.
                  for stat in cluster.get('statistics', []):
                      if stat['name'] != 'runningFargateTasksCount':
                          continue
                      logger.debug(
                          'Found %s Fargate tasks in cluster %s',
                          stat['value'], cluster_arn
                      )
                      fargate_task_count += int(stat['value'])
                  self._find_usage_one_cluster(cluster['clusterName'])
          self.limits['Fargate Tasks']._add_current_usage(
              fargate_task_count, aws_type='AWS::ECS::Task'
          )
          self.limits['Clusters']._add_current_usage(
              count, aws_type='AWS::ECS::Cluster'
          )
docs: Find the ECS service usage for clusters. Calls
          :py:meth:`~._find_usage_one_cluster` for each cluster.