bugsnag

Monitor everything you're building.

     

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collectd

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

     

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Rollbar

Detect, diagnose and defeat errors.

     

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Sentry

Automate error tracking to find and fix issues before your users even experience a crash. Sentry is open-source, real-time, and loved by 100,000 developers around the world.

     

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Zabbix

An open source, enterprise-class monitoring framework

     

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