Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4644#discussion_r25213794
--- Diff: docs/monitoring.md ---
@@ -176,6 +176,7 @@ Each instance can report to zero or more _sinks_. Sinks
are contained in the
* `JmxSink`: Registers metrics for viewing in a JMX console.
* `MetricsServlet`: Adds a servlet within the existing Spark UI to serve
metrics data as JSON data.
* `GraphiteSink`: Sends metrics to a Graphite node.
+* `Slf4jSink`: Sends metrics to log4j as logging entries
--- End diff --
Couldn't it be sent from slf4j to another logging system too? it's possible
to swap out the slf4j-log4j binding that Spark uses with a little work.
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