We have installed Zabbix in different locations of customer's sites. 

In one of our customer site's (Using 2.x version) we have noticed that triggers are not generating. 

Zabbix server/agent are up and running and I can see the updated data under latest update section. 

How ever non of the triggers generating. It was working till 08th Oct 2020 from 2015. 

Can you please help us with few points to troubleshoot this issue?