What are the four types of macros in Zabbix and how are they formatted?

In Zabbix, macros are placeholders that can be replaced with specific values when used within configurations. Understanding the types of macros is essential for effective use of Zabbix, particularly when dealing with dynamic configurations.

The correct set of four types of macros includes built-in macros, user-defined macros, low-level discovery macros, and expression macros.

• Built-in macros are predefined by Zabbix and can be used throughout the system. They often represent context or system-specific details, such as the hostname or the template name.

• User-defined macros are custom variables that users create to hold values specific to their Zabbix environment. These can be applied in different contexts, making configurations more dynamic and easier to manage.

• Low-level discovery macros are designed specifically for low-level discovery rules and are used to represent the discovered items, such as the device's network interfaces or file systems.

• Expression macros allow users to evaluate conditions directly in configurations, which can significantly enhance the flexibility of monitoring setups.

This categorization not only aids in correctly utilizing these macros within the Zabbix environment but also allows for better customization and dynamic adjustment of monitoring configurations. Each type serves a distinct purpose that contributes to the overall functionality of the monitoring system.