gitlab-org--gitlab-foss/app/services/projects/batch_open_issues_count_service.rb

# Service class for getting and caching the number of issues of several projects
# Warning: do not user this service with a really large set of projects
# because the service use maps to retrieve the project ids
module Projects
  class BatchOpenIssuesCountService < Projects::BatchCountService
    def global_count
      @global_count ||= begin
        count_service.query(project_ids).group(:project_id).count
      end
    end

    def count_service
      ::Projects::OpenIssuesCountService
    end
  end
end