The items that tell us about the number of unsupported items either for the whole Zabbix installation or for a specific host are useful and tell us when things aren't good. But what exactly isn't good? There's a very easy way to review the unsupported item list in the frontend. Follow these steps:

1. Navigate to Configuration | Hosts, click on any of the Items links, and expand the item filter. Clear out any host, host group, or other filter option that's there, and look at the right-hand side of the filter.
2. In the State drop-down menu, choose Not supported and click on Filter.

This will display all of the unsupported items in this Zabbix instance. Note that we may not display all items in all states like this; the filter will require at least one condition to be set, and the state condition counts.

It's highly recommended to visit this view every now and then and try to fix as many unsupported items as possible. Unsupported items are bad. Note that by default, up to 1,000 entries will be shown. If you have more than 1,000 unsupported items, that's a pretty bad situation and should be fixed.