... value that means healthy. It usually does not have a separate value for "I could not tell". So the second collapses into the first, and it collapses in the direction that looks fine. The clearest version came from mectrics, a Mac monitoring app. I asked Faruk what his CLI's check command exits when it cannot read the sensor at all. If that is 0, then "within limits" and "I could not look" are the same exit code ...