Red Device Icon Meaning

[sync]

My Hubitat stopped work with Home Assistant. When I logged into the Hubitat, it responded slowly. I did a reboot and it was snappier. I then updated to the latest release and my devices started to work with Home Assistant again. I give this as background in case it has something to do with my question.

When I go to the device page, which I haven't looked at in a year or two, some of the devices have red icons. I didn't see anything in the device page documentation I found online about icon color. The red device appears to be working with Hubitat as there are current event and log entries. What does the red color mean?

[bertabcd1234]

That's just a representation of the current device state (some representative value for devices that expose multiple possibilities, apparently motion in your case). Green wit a line through the icon means no motion. Red with no line means motion. So, the "Library Main" sensor was reporting "motion: active," as seen in Current States on the device detail page, at the time you took that screenshot.