Mehrdad Nurolahzade created AURORA-1829:
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             Summary: Expose stats on preemptor BiCache expirations
                 Key: AURORA-1829
                 URL: https://issues.apache.org/jira/browse/AURORA-1829
             Project: Aurora
          Issue Type: Story
          Components: Scheduler
            Reporter: Mehrdad Nurolahzade
            Priority: Minor


We are currently collecting stats for the size of preemptor {{BiCache}} 
({{reservation_cache_size}}). We could additionally collect cache expiration 
stats to monitor overall preemption effectiveness. 

Currently, we have no visibility into whether reservations made by preemption 
are actually consumed or simply expire.



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