Tools and applications | Logging
In computing, a log file is a file that records either events that occur in an operating system or other software runs, or messages between different users of a communication software. Logging is the act of keeping a log. In the simplest case, messages are written to a single log file. Source: Wikipedia

Used to collect metrics from our system(s). We could be using Collectd in multiple systems to collect each system’s metrics.
Used to transport and aggregate our metrics from each system into our destination. This destination could be a file or a database or something else. Logstash works on a system of plugins for input, filtering and output. In this case, our input is Collectd and out output is Elasticsearch.
Used to store and search our collected metrics. This is our Logstash output.
Used to display our metrics stored in Elasticsearch.
The Webalizer is a fast, free web server log file analysis program. It produces highly detailed, easily configurable usage reports in HTML format, for viewing with a standard web browser.
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Heka is an open source stream processing software system developed by Mozilla. Heka is a “Swiss Army Knife” type tool for data processing, useful for a wide variety of different tasks.
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