Github user judynash commented on a diff in the pull request:
https://github.com/apache/spark/pull/4644#discussion_r25213651
--- 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 --
Intended to say log4j because that's the final destination. (the pipeline
is metrics data -> slf4j -> log4j), but can see why it's confusing. Updating
string to say "send metrics to log4j via slf4j" to be clear.
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