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os-smart was enabled on my machine.
Information section says that
Warning  Comp. Temp. Threshold:     100 Celsius
Critical Comp. Temp. Threshold:     110 Celsius

=== START OF SMART DATA SECTION ===
SMART overall-health self-assessment test result: FAILED!
- temperature is above or below threshold

SMART/Health Information (NVMe Log 0x02, NSID 0xffffffff)
Critical Warning:                   0x02
Temperature:                        -1 Celsius

It would appear that the program doesn't know what to do with a negative temperature reading. It certainly isn't overheating in my -28 degree C garage in the middle of winter.

Received the following alert this evening for my firewall. It corresponded to stopping of Internet access.

2026-01-22T22:51:13-06:00Noticekernel[370] nvme0: temperature above threshold

My firewall is installed in my garage in Minnesota and the outside air temperature is below -20 F degrees. Health report states the CPUTEMP is 0 Degrees C. My garage is probably below -5 right now.

The graph seems to not allow below O measurements.
Any advice besides heating my firewall with a hair dryer?