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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 <a href="https://opensource.com/article/18/9/open-source-log-aggregation-tools">ELK stack</a>.</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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