code: func (s *Scheduler) InstancesFromAttachedRuns(ctx context.Context, app string) ([]*twelvefactor.Task, error) {
  	// Filter only docker containers that were started as an attached run.
  	attached := fmt.Sprintf("%s=%s", runLabel, Attached)
  	return s.instances(ctx, app, attached)
  }
docs: // InstancesFromAttachedRuns returns Instances that were started from attached
  // runs.