Each host can have many problems related to zabbix internals

• items becoming not supported
• triggers becoming not supported
• failed LLD

Like so:

All of these types of internal problems are shown as red crosses in configuration. But they all can be found in different parts of UI:

• broken items - in items configuration
• broken triggers - in triggers configuration
• failed LLD - in LLD configuration

Sometimes you find out that there is a problem with host by incident when browsing configuration for some other particular reason. So I suggest to implement two things:

• In Configuration -> Hosts add host health indication. It should be a warning icon near the host if it has at least single item, trigger, or lld not supported.
  • Pressing the icon should open a new page with all host internal problems 
• Add new internal metric that will log all internal events for particular host. This will allow to show all internal problems as trigger problems if required
  • Also add metric that will sum not supported triggers and LLD as well and not only items, like zabbix[host,,items_unsupported]