Sounds like the Offline diagnostics tile that I saw. I was going to screenshot it but I had set it not to show a normally offline hub. However now I can’t change it back because the settings are only there when the tile is displayed. I can’t find an equivalent of the old Home insight settings where I can access the settings for dynamic tiles.
Update: I found the setting in Offline diagnostics on the Menu tab. Which I suppose is fair enough really.
It turns out you now only get to see the tile if the SmartThings Now function is enabled (it’s in Edit Home tab), and that is the first thing I turned off because I really dislike the ‘suggestions’.
If you close a suggestion in SmartThings Now it isn’t shown again and so you can remove all the suggestions and the tile will disappear. Perhaps surprisingly you can also dismiss the Offline diagnostics warning in the same way. Presumably the suggestions cycle will restart at some time.
Offline diagnostics on the Menu tab makes a point of saying something needs attention but curiously nothing highlights that on the Menu page, and nothing highlights the Menu page (so no dots as we used to see).