[tor-bugs] #20540 [Metrics]: define log-levels for all java metrics-products

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#20540: define log-levels for all java metrics-products
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 Reporter:  iwakeh       |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  Medium       |      Milestone:
Component:  Metrics      |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
 Reviewer:               |        Sponsor:
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Comment (by iwakeh):

 A summary of what is in place or known already:

 * java projects should use slf4j (our default implementation is logback,
 but that is less important)
 * errors are possibly mailed by logging frameworks (in their default
 settings). So error level should be important (an 'action item') for
 operation.
 * info-level should give an indication that all things are running as
 expected.
 * maybe, log statistics to separate log files (as in Onionoo).
 * what else?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20540#comment:1>
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