Github user skonto commented on the issue:
https://github.com/apache/spark/pull/22381
@erikerlandson I dont any tests for sources AFAIK, they exist for the
metric system itself. From the commit history this look like an old feature.
Regarding enabling or disabling them no at the moment. But it is fairly easy to
do via spark conf as there is one flag for structured streaming already
`spark.sql.streaming.metricsEnabled`.
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