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The CMS Silicon Strip Tracker is the largest detector of its kind ever operated, with a silicon surface area of about 200 m2. The Silicon Strip Tracker is the sub-detector with the highest number of detector modules within the CMS experiment. Given the complexity of the device, a variety of tools were developed and are used to determine the status of the detector in real time and allow for data qualification and corrective actions when needed. In this paper we describe the monitoring techniques that are used to safely operate the detector and assess the state of its calibration.