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annotate mod_log_slow_events/README.markdown @ 4738:5aee8d86629a

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mod_bookmarks2: Fix handling of nick and password elements This form of child retrieval fails when the stanza elements internally don't have an 'xmlns' attribute, which can happen sometimes for some reason, including when they have been constructed via the stanza builder API. When that is the case then the explicit namespace arguemnt does not match the nil value of the internal attribute. Calling `:get_child()` without the namespace argument does the right thing here, with both nil and the parent namespace as valid values for the internal attribute.
author Kim Alvefur <zash@zash.se>
date Wed, 03 Nov 2021 21:11:55 +0100
parents d276bf3f0464
children
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1 ---
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2 labels:
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3 - 'Stage-Stable'
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4 summary: Log warning when event handlers take too long
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5 ...
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6
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7 Introduction
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8 ============
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9
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10 Most activities in Prosody take place within our built-in events framework, for
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11 example stanza processing and HTTP request handling, authentication, etc.
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12
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13 Modules are able to execute code when an event occurs, and they should return
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14 as quickly as possible. Poor performance (e.g. slow or laggy server) can be caused
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15 by event handlers that are slow to respond.
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16
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17 This module is able to monitor how long each event takes to be processed, and
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18 logs a warning if an event takes above a certain amount of time, including
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19 providing any details about the event such as the user or stanza that triggered it.
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20
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21 The aim is to help debug why a server may not be as responsive as it should be,
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22 and ultimately which module is to blame for that.
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23
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24 Configuration
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25 ======================
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26
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27 There is a single configuration option:
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28
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29 ```
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30 -- Set the number of seconds an event may take before
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31 -- logging a warning (fractional values are ok)
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32 log_slow_events_threshold = 0.5
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33 ```
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34
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35 Metrics
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36 =======
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37
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38 In addition to the log messages, a new 'slow_events' metric will be exported to
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39 your configured stats backend (if any).
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40
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41 Compatibility
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42 -------------
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43
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44 ------- --------------
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45 trunk Works
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46 0.10 Works
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47 0.9 Doesn't work
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48 0.8 Doesn't work
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49 ------- --------------