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Nagios is an open source software that monitors systems, networks, and infrastructure. We need such a monitoring tool because when we deploy OnionPerf instances to run experiments, they typically run for days or weeks at a time. These experiments often require code changes to underlying Tor processes or to network-wide parameters, which makes them susceptible to breakage. When the instances break, our experiments are disrupted and thus ineffective. It’s cumbersome to manually check these instances for breakage or errors. Having robust monitoring tools makes it possible for our small team to run experiments efficiently.