Looking at the same overview screen, the data seems easier to understand with textual hints provided for previously cryptic numeric values, but there's still a bit of not-so-perfect displaying. Notice the dashes displayed for the CPU load item for Another host and all other values for A test host. We didn't create corresponding items on both hosts, and item data is displayed here, which means missing items should be created for each host to gather the data. But recreating all items would be very boring. Luckily, there's a simple and straightforward solution to this problem.
Go to Configuration | Hosts and click on Items next to A test host. We had only a single item configured for this host, so mark the checkbox next to this ...
