Ah, that is a very good point @Carl . I checked that one out and it turns out that there is one called "Hub Information Aggregation" which I installed some time ago. It has a notification feature for temperature, but I had not set it to any temp for reporting, only for database size. Once I changed that to 50°C the reporting stops. So, it therefore seems that when it is empty, It will report at 46°C and higher (and perhaps a bit lower). Perhaps this is a bug ?
Due to this discovery, the reporting has stopped, so the cause has been found. Tagging in @thebearmay as he is the developer of this integration: [BETA -Release Candidate] Hub Information Driver Aggregation App - Developers - Hubitat
EDIT: I do wonder what a "normal" operationg temperature is for the Hub ? Is it 46°C (114.6°F) for most ? In any case, 46°C does not seem that high with electronics equipment.