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Prometheus exporter #1200

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Prometheus exporter #1200

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Commits on Dec 11, 2021

  1. Prometheus exporter 

    Add a new command: cmsPrometheusExporter

This will start a new HTTP server that listens on a port (defaults to
8811) for requests to /metrics. At this endpoint many metrics about a
contest (or all contests) are exposed for Prometheus to be collected.
Those metrics consider both system values (queue status, connected
workers, ...) and contest values (submissions, users, questions, ...)

The metrics exposed may leak information about the contest, so it's
important to secure this endpoint (for example using a reverse proxy, or
binding localhost).

With this exporter it's possible to build interactive and real-time
dashboard for monitoring the status of the contest. For example, you can
find here [1] the dashboard we used at OII 2020, and here [2] the one
used at an OIS round.

[1]: https://snapshot.raintank.io/dashboard/snapshot/0J29w0KruEiymy6zV30beX98aRG6njiX?orgId=2

[2]: https://snapshot.raintank.io/dashboard/snapshot/JngCBt71ZOJhiyEUC7yxZhS3guZmZYYi?orgId=2
    @edomora97
    edomora97 committed Dec 11, 2021
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