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Lm-sensors has a daemon, called sensord, that uses RRDtool for 'data logging and graphing system for time series data'.

Very useful for systems automation (in the home, workshop, weather station, you name it). Easily measure various types of data (rotational speeds, voltages, temperatures, etc.) using cheap off-the-shelf parts. using off-the-shelf components and utilizing a range of bus interfaces (e.g. These can use this package to monitor voltages, temperatures, fan speeds, etc. That way, you can be alerted within seconds of a failing critical component such as a power supply, fan, other cooling mechanism, or even detect if the case has been opened. Easily create a cron job to query the status of your hardware and email you in the event of a problem before it becomes critical.