xymon - 4.3.28-5+deb10u1 main

Xymon (previously called Hobbit) is a network- and applications-
monitoring system designed for use in large-scale networks. But it will
also work just fine on a small network with just a few nodes. It is
low-overhead and high-performance, with an easy to use web front-end.
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Network services are monitored remotely. Machine health and
statistics are monitored through a locally installed client package
(xymon-client). Additional (remote as well as local) checks are
available in the package hobbit-plugins.
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Alerts can trigger when monitoring detects a problem, resulting in
e-mails or calls to your pager or mobile phone.
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Xymon has a great deal of inspiration from the non-free Big Brother
package, but does not include any Big Brother code.