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- <h1 id="structured-logging"><a class="header" href="#structured-logging">Structured Logging</a></h1>
- <p>A structured logging system can be useful when your logs are destined for a
- machine to parse and process. By maintaining its machine-readable characteristics,
- it enables more efficient searching and aggregations when consumed by software
- such as the "ELK stack".</p>
- <p>Synapse's structured logging system is configured via the file that Synapse's
- <code>log_config</code> config option points to. The file should include a formatter which
- uses the <code>synapse.logging.TerseJsonFormatter</code> class included with Synapse and a
- handler which uses the above formatter.</p>
- <p>There is also a <code>synapse.logging.JsonFormatter</code> option which does not include
- a timestamp in the resulting JSON. This is useful if the log ingester adds its
- own timestamp.</p>
- <p>A structured logging configuration looks similar to the following:</p>
- <pre><code class="language-yaml">version: 1
- formatters:
- structured:
- class: synapse.logging.TerseJsonFormatter
- handlers:
- file:
- class: logging.handlers.TimedRotatingFileHandler
- formatter: structured
- filename: /path/to/my/logs/homeserver.log
- when: midnight
- backupCount: 3 # Does not include the current log file.
- encoding: utf8
- loggers:
- synapse:
- level: INFO
- handlers: [remote]
- synapse.storage.SQL:
- level: WARNING
- </code></pre>
- <p>The above logging config will set Synapse as 'INFO' logging level by default,
- with the SQL layer at 'WARNING', and will log to a file, stored as JSON.</p>
- <p>It is also possible to configure Synapse to log to a remote endpoint by using the
- <code>synapse.logging.RemoteHandler</code> class included with Synapse. It takes the
- following arguments:</p>
- <ul>
- <li><code>host</code>: Hostname or IP address of the log aggregator.</li>
- <li><code>port</code>: Numerical port to contact on the host.</li>
- <li><code>maximum_buffer</code>: (Optional, defaults to 1000) The maximum buffer size to allow.</li>
- </ul>
- <p>A remote structured logging configuration looks similar to the following:</p>
- <pre><code class="language-yaml">version: 1
- formatters:
- structured:
- class: synapse.logging.TerseJsonFormatter
- handlers:
- remote:
- class: synapse.logging.RemoteHandler
- formatter: structured
- host: 10.1.2.3
- port: 9999
- loggers:
- synapse:
- level: INFO
- handlers: [remote]
- synapse.storage.SQL:
- level: WARNING
- </code></pre>
- <p>The above logging config will set Synapse as 'INFO' logging level by default,
- with the SQL layer at 'WARNING', and will log JSON formatted messages to a
- remote endpoint at 10.1.2.3:9999.</p>
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