Currently, we are monitoring several parameters on our hosts, including network traffic. We configured those items by finding out the interface name and then manually specifying it for all of the relevant items. Interface names could vary from one system to another, and there could be a different number of interfaces on each system. The same could happen with filesystems, CPUs, and other entities. They could also change—a filesystem could get mounted or unmounted. Zabbix offers a way to deal with such different and potentially dynamic configurations with a feature called LLD. In the Zabbix documentation and community, it is usually known as LLD, and that is how we will refer to it in this book, too.
LLD normally enables us to discover entities on existing hosts (we will discuss more advanced functionality related to discovering hosts with LLD in Chapter 16, Monitoring...