Dashboard to indicate if device/entity is not working normally

[jefft4]

Currently, when an entity isn't working - perhaps wi-fi is down and an integration can't connect to the remote device - any attempt to control the entity results in an error in the log but no indication in the UI that the action wasn't successful. The entity state quietly returns to its previous condition. The user can click, then go away thinking they've changed the state of the entity, but unless they come back a minute or so later and check, they're unaware they weren't successful. It's silent failure - in control systems, that's considered dangerous.

It would help if the user were made aware of problems by indicating them in the UI. A flag on the entity, or a change of colour of the device panel, would make clear that a device has had problems and normal behaviour can't be expected. This could be reset when a later action (either manual or automated) succeeds. A notification at the time of each failure would also help.