[tor-bugs] #20430 [Metrics/metrics-lib]: log-level definition for metrics-lib

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#20430: log-level definition for metrics-lib
---------------------------------+-----------------------------------
 Reporter:  iwakeh               |          Owner:  karsten
     Type:  enhancement          |         Status:  new
 Priority:  Medium               |      Milestone:  metrics-lib 1.6.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
---------------------------------+-----------------------------------

Comment (by iwakeh):

 The following should rather be info level, b/c this happens once in a
 while and doesn't constitute an error.  (and errors are mailed by the some
 logging frameworks.)

 {{{
 2016-10-21 17:35:20,640 CollecTor-Scheduled-Thread-7 ERROR
 org.torproject.descriptor.index.DescriptorIndexCollector Cannot fetch
 remote file: 2016-10-18-17-05-00-server-descriptors
 java.io.FileNotFoundException: https://collector.torproject.org/recent
 /relay-descriptors/server-descriptors/2016-10-18-17-05-00-server-
 descriptors
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20430#comment:1>
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