Michael McCandless commented on LUCENE-8884:

I plan to push this soon ... just adds this new directory wrapper to {{misc}} 

> Add Directory wrapper to track per-query IO counters
> ----------------------------------------------------
>                 Key: LUCENE-8884
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8884
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/store
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>         Attachments: LUCENE-8884.patch
> Lucene's IO abstractions ({{Directory, IndexInput/Output}}) make it really 
> easy to track counters of how many IOPs and net bytes are read for each 
> query, which is a useful metric to track/aggregate/alarm on in production or 
> dev benchmarks.
> At my day job we use these wrappers in our nightly benchmarks to catch any 
> accidental performance regressions.

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