Summary: Although there are currently counters to keep track of the stall caused by having too many L0 files, there is no distinction as to whether when that stall occurs either (A) L0-L1 compaction is taking place to try and mitigate it, or (B) no L0-L1 compaction has been scheduled at the moment. This diff adds a counter for (A) so that the nature of L0 stalls can be better understood. Test Plan: make all && make check Reviewers: sdong, igor, anthony, noetzli, yhchiang Reviewed By: yhchiang Subscribers: MarkCallaghan, dhruba Differential Revision: https://reviews.facebook.net/D46749main
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