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

 * status:  new => accepted


Old description:

> This would be very helpful for other projects like the Analytics Server.

New description:

 This would be very helpful for all metrics-lib clients/users.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19643#comment:2>
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