Adding an item or any other entity to a template is virtually identical to the same operation performed on a regular host. This is especially true for items. As you already know, item keys are the basic building blocks of the Zabbix monitoring pipeline, and you don't have to specify any kind of address or interface when you create them as Zabbix will take this kind of information from the host the item is assigned to. This means that when you create items for a template, you are effectively creating items for an ideal host that will be later applied to real ones once you have linked the template to the hosts you want to monitor.
Note
Templates, just like hosts, are essentially collections of items, triggers, and graphs. Since many of the concepts that we will explore apply equally to items, triggers, and graphs, for the rest of the chapter we'll use the term entity to refer to any of the three types of objects. In other words, you can understand an item, trigger...