Zabbix Low-Level Discovery (LLD) and Overrides Quiz Day2 P4

Zabbix Low-Level Discovery (LLD) and Overrides

• The Filters tab in Zabbix contains filter definitions with options like regular expressions, user macros, and global regular expressions.
• Options for calculating filters include And, Or, And/Or, and Custom expression, affecting the treatment of filtered out objects.
• Filter condition operators available in Zabbix include matches, does not match, exists, and does not exist, based on LLD macro presence or absence.
• Practical setup for LLD involves creating new filters, ensuring their functionality, and cleaning up lost items.
• Overrides in Zabbix allow setting rules to modify attributes for discovered objects based on filter matching LLD macros.
• Override operations in Zabbix affect entities like items, triggers, graphs, and hosts created from host prototypes, with options to change attributes for discovered objects.
• Overrides in Zabbix are executed in the order they are defined, and subsequent overrides are processed based on the "Continue overrides" setting.
• A practical setup for overrides involves adding a new dummy network interface, creating trigger prototypes, executing the network interfaces discovery rule, and creating overrides for triggers.
• Discovery using dependent items in Zabbix involves a rule type called Dependent item, which is updated every time the master item collects data.
• A discovery rule can create dependent items in Zabbix, which may depend on regular items in the same host/template or items created from a prototype by the same discovery rule.
• Master item data in Zabbix can be used to discover entities and fill discovered items with values, and if a history is set to "Do not keep history," the master item will populate only dependent items.
• In Zabbix, dependent items are displayed with their master item name as a prefix in the item list, and it is possible to create a dependent item from another dependent item, up to 3 levels supported.