collectd

A daemon that collects system performance statistics periodically, and provides tons of plugins to store and analyze these values

     

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Nagios Core

Nagios Core network monitoring software is a powerful, enterprise-class host, server, application, monitoring and alerting tool

     

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Zabbix

An open source, enterprise-class monitoring framework

     

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Zipkin

A distributed request tracking system, useful for micro-service and distributed architectures written in Scala

     

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