Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/19775
My original intention is to expose MetricsSystem related interface in
#11994 , so that users can leverage such interface to build their own metrics
sink/source out of Spark. Unfortunately I'm stuck on the #11994 , but still I
think it is better to leave this as a package out of Spark, pulling to much
dependencies for non-core functionalities seems not so reasonable (just my
thoughts).
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