Custom loadable plugins extend Zabbix agent 2 functionality. They are compiled separately, but use a package shared with Zabbix agent 2.
Each plugin is a Go package that defines the structure and implements one or several plugin interfaces (Exporter, Configurator, Runner).
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Zabbix agent 2 connects bidirectionally to the plugins using UNIX sockets on Linux and Named Pipes on Windows.
The connection diagram below illustrates the communication process between Zabbix agent 2 and a loadable plugin and the metrics collection process.