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mod_prometheus/README.markdown

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mod_prometheus: Update readme with "manual" statistics interval
author Jonas Schäfer <jonas@wielicki.name>
date Sun, 18 Apr 2021 14:00:10 +0200
parent 4239:313e293f44b3
child 4790:bb66e87a3604
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1 ---
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2 labels:
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3 - Statistics
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4 summary: Implementation of the Prometheus protocol
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5 ...
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6
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7 Description
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8 ===========
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9
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10 This module implements the Prometheus reporting protocol, allowing you
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11 to collect statistics directly from Prosody into Prometheus.
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13 See the [Prometheus documentation][prometheusconf] on the format for
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14 more information.
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16 [prometheusconf]: https://prometheus.io/docs/instrumenting/exposition_formats/
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17
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18 Configuration
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19 =============
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20
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21 mod\_prometheus itself doesn’t have any configuration option, but it
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22 requires Prosody’s [internal statistics
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23 provider](https://prosody.im/doc/statistics#built-in_providers) to be
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24 enabled. You may also want to change the default collection interval
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25 to the one your statistics consumer is using. See below for more information.
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26
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27 ```lua
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28 statistics = "internal"
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29 statistics_interval = 15 -- in seconds
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30 ```
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31
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32 ::: {.alert .alert-warning}
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33 **NOTE:** Make sure to put the statistics variables in the global section of
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34 the configuration, **not** in a `VirtualHost` or `Component` section. You can
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35 use `prosodyctl check` if you are unsure and want to check your configuration.
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36 :::
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37
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38 See also the documentation of Prosody’s [HTTP
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39 server](https://prosody.im/doc/http), since Prometheus is an HTTP
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40 protocol that is how you can customise its URL. The default one being
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41 http://localhost:5280/metrics
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42
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43 Scrape interval vs statistics_interval
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44 --------------------------------------
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46 The `statistics_interval` should be set to `"manual"` on trunk if and only
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47 if you have a single Prometheus instance scraping Prosody. This will allow
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48 the internal statistics gathering to run optimally.
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49
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50 If you have multiple instances scraping Prosody, set `statistics_interval`
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51 to the scrape interval of Prometheus to avoid errors in rate calculations
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52 and similar.
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53
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54 Future work will allow the use of `"manual"` with multiple Prometheus
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55 instances and varying scrape intervals (stay tuned).
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56
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57 Compatibility
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58 =============
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59
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60 ------- -------------
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61 trunk Works
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62 0.11 Works
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63 0.10 Works
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64 0.9 Does not work
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65 ------- -------------