Graphite
Graphite is a visualization tool for statistics configured from various sources. You can create customizable reports and dashboards, and it is one of the preferred backends for Statsd
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Monit
An open source utility for managing and monitoring processes, programs, files, directories and filesystems
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Supervisor
Supervisor can manage application processes. It can start and stop a group of processes, restart processes if any of them terminate (keep-alive), start multiple instances of the same process (process pooling), automatically manage PID files, and much more! Very useful if you need to manage multiple processes for your application.
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