What is Prometheus used for?
Prometheus is the god of fire , symbolizing the quest for knowledge. It is also an open source monitoring system designed to gather and store metrics along with key/value pairs in a time-series database. The gathering of data happens via a pull model where a Prometheus server periodically polls a client running a server that returns specially formatted text files over HTTP.
The data format is a simple to implement text file consisting of a comment describing the metric followed by the metric. All metric values are 64bit floats. There are four basic metric types - counter, gauge, histogram and summary.
Anything that you can generate a metric for, can be monitored. Many existing software packages already have a built in metric exporter.
For more information see the Prometheus web site https://prometheus.io/
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