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<ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="setup/turn/coturn.html">coturn TURN server</a></li><li class="chapter-item expanded "><a href="setup/turn/eturnal.html">eturnal TURN server</a></li></ol></li><li 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<h1 id="structured-logging"><a class="header" href="#structured-logging">Structured Logging</a></h1>
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<p>A structured logging system can be useful when your logs are destined for a
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machine to parse and process. By maintaining its machine-readable characteristics,
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it enables more efficient searching and aggregations when consumed by software
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such as the <a href="https://opensource.com/article/18/9/open-source-log-aggregation-tools">ELK stack</a>.</p>
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<p>Synapse's structured logging system is configured via the file that Synapse's
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<code>log_config</code> config option points to. The file should include a formatter which
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uses the <code>synapse.logging.TerseJsonFormatter</code> class included with Synapse and a
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handler which uses the above formatter.</p>
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<p>There is also a <code>synapse.logging.JsonFormatter</code> option which does not include
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a timestamp in the resulting JSON. This is useful if the log ingester adds its
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own timestamp.</p>
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<p>A structured logging configuration looks similar to the following:</p>
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<pre><code class="language-yaml">version: 1
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formatters:
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structured:
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class: synapse.logging.TerseJsonFormatter
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handlers:
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file:
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class: logging.handlers.TimedRotatingFileHandler
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formatter: structured
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filename: /path/to/my/logs/homeserver.log
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when: midnight
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backupCount: 3 # Does not include the current log file.
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encoding: utf8
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loggers:
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synapse:
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level: INFO
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handlers: [remote]
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synapse.storage.SQL:
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level: WARNING
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</code></pre>
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<p>The above logging config will set Synapse as 'INFO' logging level by default,
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with the SQL layer at 'WARNING', and will log to a file, stored as JSON.</p>
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<p>It is also possible to configure Synapse to log to a remote endpoint by using the
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<code>synapse.logging.RemoteHandler</code> class included with Synapse. It takes the
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following arguments:</p>
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<ul>
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<li><code>host</code>: Hostname or IP address of the log aggregator.</li>
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<li><code>port</code>: Numerical port to contact on the host.</li>
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<li><code>maximum_buffer</code>: (Optional, defaults to 1000) The maximum buffer size to allow.</li>
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</ul>
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<p>A remote structured logging configuration looks similar to the following:</p>
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<pre><code class="language-yaml">version: 1
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formatters:
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structured:
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class: synapse.logging.TerseJsonFormatter
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handlers:
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remote:
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class: synapse.logging.RemoteHandler
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formatter: structured
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host: 10.1.2.3
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port: 9999
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loggers:
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synapse:
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level: INFO
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handlers: [remote]
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synapse.storage.SQL:
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level: WARNING
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</code></pre>
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<p>The above logging config will set Synapse as 'INFO' logging level by default,
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with the SQL layer at 'WARNING', and will log JSON formatted messages to a
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remote endpoint at 10.1.2.3:9999.</p>
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