There are Items from SNMP LLD. They are dynamic - tunnel interfaces, ARP tables, MAC tables, etc. There are triggers for these Items. These triggers are also from LLD. Sometimes there are situations when the trigger switches to active and then no longer be reset. It is not reseting because Item no longer exists. It exists in the database Zabbix, but data can not be obtained - No Such Instance currently exists at this OID. This is a normal situation for these Items - they are in fact dynamic. The trigger formula has all the needed conditions and nodata and count, but it does not help because zabbix refuses to calculate the trigger. And trigger will have its last value - Active until Item itself exists in the database. In my case it is 10 days. Is there any built-in mechanism for such triggers to switch them off or disable?