
Open source monitoring for servers, networks and applications
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Nagios Core is a long-standing IT monitoring system. It checks hosts, services and network devices on a schedule, and sends alerts to administrators when something fails or crosses a threshold. A large plug-in ecosystem covers common protocols and applications, so sysadmins can extend checks without much code. More than a million users rely on it to spot outages early. The core is free and open source, with commercial products from the company.
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