[metrics-bugs] #22983 [Metrics/metrics-lib]: add a descriptor interface and implementation for web-logs

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#22983: add a descriptor interface and implementation for web-logs
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     Reporter:  iwakeh               |      Owner:  metrics-team
         Type:  enhancement          |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Metrics/metrics-lib  |    Version:
     Severity:  Normal               |   Keywords:
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 The webstats-log-files are the only files available on CollecTor (in
 future) that are not yet covered by metrics-lib.

 Should there be a 'LogDescriptor' interface and implementation in metrics-
 lib? Are there any reasons why not?

 The name `LogDescriptor` is just a working name; better naming suggestions
 welcome.
 The interface should extend `Descriptor` and have additional methods for
 retrieving the measuring host and the served host, a method for retrieving
 the date of the log.
 What else?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22983>
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