[tor-bugs] #16873 [metrics-lib]: add javadoc to metrics-lib

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#16873: add javadoc to metrics-lib
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 Reporter:  iwakeh       |          Owner:  karsten
     Type:  enhancement  |         Status:  needs_information
 Priority:  Low          |      Milestone:
Component:  metrics-lib  |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:  #18746       |         Points:
 Reviewer:               |        Sponsor:
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Comment (by karsten):

 Pushed another commit with better docs for extra-info descriptors.  That
 commit also contains class-level documentation for server and extra-info
 descriptors.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16873#comment:11>
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