Simple graphs in Zabbix are something really immediate since you don't need to put in a lot of effort to configure this feature. You only need to go to Monitoring | Latest data, eventually filter by the item name, and click on the graph. Zabbix will show you the historical graph, as shown in the following screenshot:

Clearly, you can graph only numeric items, and all the other kinds of data, such as text, can't be shown on a graph. On the latest data item, you will see the graph link instead—a link that will show the history.

At the top of the graphs, there is the time period selector. If you enlarge this period, you will see the aggregated data. As long as the period is little and you would like to see very recent data, you will see a single line. If the...