[tor-bugs] #19643 [Metrics/metrics-lib]: use slf4j in DescripTor instead of System.err or printStackTrace

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#19643: use slf4j in DescripTor instead of System.err or printStackTrace
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     Reporter:  iwakeh               |      Owner:  iwakeh
         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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 This would be very helpful for other projects like the Analytics Server.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19643>
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