Github user squito commented on the issue:
https://github.com/apache/spark/pull/20056
I see that `LiveListenerBus.droppedEventsCounter` and `lastReportTimestamp`
are unused, so it certainly makes sense to clean them up one way or the other
-- but that might mean we should delete them, not that we necessarily need to
do something else with them.
I could see an argument that there are already monitoring systems hooked up
to the old metric,
["numEventsDropped"](https://github.com/apache/spark/blob/718bbc939037929ef5b8f4b4fe10aadfbab4408e/core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala#L266),
so maybe we should bring back the total with that metric.
But do you really want even more logging of the total, beyond the logging
from each queue? Seems like it would only be more confusing to me.
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