Github user aditanase commented on the issue:
https://github.com/apache/spark/pull/22381
@skonto @vanzin You can rest assured the metrics are not shipped anywhere.
Collection is cheap/free and completely decoupled from reporting.
The registry is only a data bag, shipping metrics is done via reporters
that are configured to "pull" metrics from the registry at regular intervals.
Also, you're mostly adding counters that are extremely simple. Histograms
and timers are more involved but the cost associated is far outweighed by the
benefits of having data points.
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