File

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−---
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−labels:
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−- 'Stage-Stable'
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−summary: Log warning when event handlers take too long
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−...
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−
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−Introduction
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−============
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−
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−Most activities in Prosody take place within our built-in events framework, for
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−example stanza processing and HTTP request handling, authentication, etc.
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−
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−Modules are able to execute code when an event occurs, and they should return
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−as quickly as possible. Poor performance (e.g. slow or laggy server) can be caused
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−by event handlers that are slow to respond.
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−
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−This module is able to monitor how long each event takes to be processed, and
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−logs a warning if an event takes above a certain amount of time, including
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−providing any details about the event such as the user or stanza that triggered it.
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−
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−The aim is to help debug why a server may not be as responsive as it should be,
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−and ultimately which module is to blame for that.
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−
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−Configuration
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−======================
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−
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−There is a single configuration option:
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−
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−```
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−   -- Set the number of seconds an event may take before
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−   -- logging a warning (fractional values are ok)
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−   log_slow_events_threshold = 0.5
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−```
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−
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−Metrics
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−=======
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−
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−In addition to the log messages, a new 'slow_events' metric will be exported to
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−your configured stats backend (if any).
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−
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−Compatibility
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−-------------
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−
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−  ------- --------------
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−  trunk   Works
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−  0.10    Works
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−  0.9     Doesn't work
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−  0.8     Doesn't work
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−  ------- --------------