def low_risks_by_host(limit=10)
                    #select("items.*").select("count(*) as count_all").joins(:host).where("plugin_id != 1").where(:severity => 1).group(:host_id).order("count_all DESC").limit(limit)
                    Item.joins(:host).where.not(plugin_id: 1).where(:severity => 1).where(:rollup_finding => false).group(:host_id).order(Arel.sql('COUNT(*) DESC')).limit(limit)