[metrics-bugs] #22983 [Metrics/Library]: Add a Descriptor subinterface and implementation for Tor web server logs

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#22983: Add a Descriptor subinterface and implementation for Tor web server logs
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 Reporter:  iwakeh           |          Owner:  metrics-team
     Type:  enhancement      |         Status:  needs_review
 Priority:  Medium           |      Milestone:  metrics-lib 2.2.0
Component:  Metrics/Library  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  metrics-2017     |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Changes (by iwakeh):

 * status:  needs_information => needs_review


Comment:

 Please review [https://gitweb.torproject.org/user/iwakeh/metrics-
 lib.git/log?h=task-22983-3 this task branch], which is based on the
 current master and already uses java 8 features.

 The implementation changed quite a bit as it could build on the web server
 log specification (#23243).  That's why I didn't continue on the earlier
 branch,  because I think the code is easier to review in total here.
 This dev version of metrics-lib was also system-tested as part of
 CollecTor's new module, i.e., used for sync and local imports there.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22983#comment:42>
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