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

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#19643: use slf4j in metrics-lib (aka DescripTor) instead of System.err or
printStackTrace
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 Reporter:  iwakeh               |          Owner:  iwakeh
     Type:  enhancement          |         Status:  needs_review
 Priority:  High                 |      Milestone:  metrics-lib 1.4.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Changes (by iwakeh):

 * priority:  Medium => High
 * status:  accepted => needs_review


Comment:

 Please review [https://gitweb.torproject.org/user/iwakeh/metrics-
 lib.git/commit/?h=task-19643-slf4j&id=91fdb9ba1f680a66b8b3df32d5e497ef6dde718b
 my branch].

 Priority set to high as I'd like to base #19791 on this.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19643#comment:3>
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