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Chapter 4 on a real Ubuntu 24.04 workstation called mgmt with a real IPMI 2.0 controller beside it, polling five live sensors once a second: reading them three ways with sensor list, sdr list and sdr elist, one sensor in full with sensor get, the six threshold columns and what na means, filtering with sdr type, a sensor baseline, a fan failing at 600 RPM against a healthy 5400, an exhaust temperature that really crosses its critical line while the lab runs, the threshold events the controller raises by itself, the fan to heat correlation, the genuine Dell R730 sensor reference, and the verdict on whether the node comes down.