change trigger severity automatically ?

[fjacob]

Hello,

I use Zabbix in version 4.0, and I'd like to modify automatically the severity of a trigger.

In order, to know the status of my differents router, I make trigger based on simple check (ping).

A trigger, with severity "warning" when a ping is ont ok
A trigger, with severity "High" when a ping is ont ok during 2 hours.
A trigger, with severity "Disaster" when a ping is ont ok during 4 hours.

Is it possible to change automatically the severity of the trigger with time.

I hope, tou understand my means because my english is not so good.

thanks,