As a sysadmin at a public university in 2006 the server room was a closet with an AC unit on the roof.

Occasionally the AC unit would freeze up, overheating the ~20 servers.

Monitoring solution was a network attached temp sensor, with a perl script monitoring it and sending alerts to an AIM (yes) account connected to an SMS gateway that would then page my flip phone.

And I have the code still, gist.github.com/ecliptik/86e77

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Found the procedure doc on what to do if/when the server room over heats too.

I kind of miss those days.

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