Github user JoshRosen commented on the issue:
https://github.com/apache/spark/pull/18083
Context for review: a large portion of the diff in this patch was undoing
changes to the LiveListenerBus constructor and `start()` method which were
introduced in #14269. That patch introduced a bunch of weird implicit
initialization order constraints in the form of `lazy val`s which was
complicating using those values in metrics gauges. See my comments over on that
other PR for more details.
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