[metrics-bugs] #31434 [Metrics/Library]: Write ANTLR parsers for dir-spec descriptors and benchmark

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#31434: Write ANTLR parsers for dir-spec descriptors and benchmark
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     Reporter:  irl              |      Owner:  metrics-team
         Type:  project          |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Library  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 We may need to reprocess large numbers of descriptors quickly in order to
 perform analysis of historical data. Using ANTLR for parsing may result in
 a more efficient solution than we currently have.

 1) Pick a descriptor type and write a grammar for it
 2) Benchmark the parser against metrics-lib's current parsers

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31434>
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