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Explore the utility 'sar', a vital tool for Linux system administrators used to monitor and analyze system activities. Covered in the guide is the installation process of the `sysstat` package across Linux distributions like Ubuntu, Fedora, and openSUSE, configuration of data collection, understanding of command outputs, and efficient problem-solving using historical data. Perfect for sysadmins at any level, this tool aids in enhancing system performance and proactive resource management.