in "triggers status" page (monitoring -> triggers), option show_triggers could be set to '2' and that would result in 'trigger status' option being set to "all".
this does not work anymore.

regression. broken by :

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r13042 | vedmak | 2010-06-22 15:48:04 +0300 (Tue, 22 Jun 2010) | 2 lines

• ZBXNEXT-424 enhanced status of trigger filter (Vedmak)
• merged: branches/1.8 13041

also see https://www.zabbix.com/documentation/1.8/manual/web_interface/page_parameters