scaled := false
	for i := range oldRSs {
		rs := oldRSs[i]
		// Scaling not required.
		if *(rs.Spec.Replicas) == 0 {
			continue
		}
		scaledRS, updatedRS, err := dc.scaleReplicaSetAndRecordEvent(ctx, rs, 0, deployment)
		if err != nil {
			return false, err
		}
		if scaledRS {
			oldRSs[i] = updatedRS
			scaled = true
		}
	}
	return scaled, nil
}