view mod_prometheus/README.markdown @ 5119:048e339706ba

mod_rest: Remove manual reference expansion in schema This hack was originally added to reduce the number of definitions of common attributes (type, to, from etc) and payloads (e.g. delay). This predated pointers and references, and until now was needed because parsing picked out the correct stanza kind from the schema, which broke internal references. Removing this hack paves the way for allowing the schema to be configured or customized more easily.
author Kim Alvefur <zash@zash.se>
date Tue, 20 Dec 2022 21:48:28 +0100
parents bb66e87a3604
children c90011054335
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---
labels:
- Statistics
summary: Implementation of the Prometheus protocol
...

Description
===========

This module implements the Prometheus reporting protocol, allowing you
to collect statistics directly from Prosody into Prometheus.

See the [Prometheus documentation][prometheusconf] on the format for
more information.

[prometheusconf]: https://prometheus.io/docs/instrumenting/exposition_formats/

**Note:** For use with Prosody trunk (0.12) we recommend the bundled
[mod_http_openmetrics](https://prosody.im/doc/modules/mod_http_openmetrics)
instead. This module (mod_prometheus) will continue to be available in the
community repository for use with older Prosody versions.

Configuration
=============

mod\_prometheus itself doesn’t have any configuration option, but it
requires Prosody’s [internal statistics
provider](https://prosody.im/doc/statistics#built-in_providers) to be
enabled.  You may also want to change the default collection interval
to the one your statistics consumer is using. See below for more information.

```lua
statistics = "internal"
statistics_interval = 15 -- in seconds
```

::: {.alert .alert-warning}
**NOTE:** Make sure to put the statistics variables in the global section of
the configuration, **not** in a `VirtualHost` or `Component` section.  You can
use `prosodyctl check` if you are unsure and want to check your configuration.
:::

See also the documentation of Prosody’s [HTTP
server](https://prosody.im/doc/http), since Prometheus is an HTTP
protocol that is how you can customise its URL.  The default one being
http://localhost:5280/metrics

Scrape interval vs statistics_interval
--------------------------------------

The `statistics_interval` should be set to `"manual"` on trunk if and only
if you have a single Prometheus instance scraping Prosody. This will allow
the internal statistics gathering to run optimally.

If you have multiple instances scraping Prosody, set `statistics_interval`
to the scrape interval of Prometheus to avoid errors in rate calculations
and similar.

Future work will allow the use of `"manual"` with multiple Prometheus
instances and varying scrape intervals (stay tuned).

Compatibility
=============

  ------- -------------
  trunk   Works (but replaced by [mod_http_openmetrics](https://prosody.im/doc/modules/mod_http_openmetrics))
  0.11    Works
  0.10    Works
  0.9     Does not work
  ------- -------------