So far we have seen how to install Zabbix, set it up and configure it. In Chapter 4, Monitoring with Zabbix we have shown you the different ways to gather data with Zabbix. The next logical step for us is now to check our data for certain values or thresholds that we are interested it. In this chapter, we will see how we can build our own triggers to get notified about certain thresholds and how to work with the trigger constructor in Zabbix. We will also see a more advanced way to build triggers and a way to test our expression before we go in production.