[tor-bugs] #24542 [Metrics/ExoneraTor]: Improve logging for Exonerator

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#24542: Improve logging for Exonerator
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     Reporter:  iwakeh              |      Owner:  metrics-team
         Type:  enhancement         |     Status:  new
     Priority:  Medium              |  Milestone:
    Component:  Metrics/ExoneraTor  |    Version:
     Severity:  Normal              |   Keywords:
Actual Points:                      |  Parent ID:
       Points:                      |   Reviewer:
      Sponsor:                      |
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 When looking at #24534 I noticed there is hardly any useful logging.
 Both backend and web-frontend need better logging.  The web-part has no
 logs so far and the logs of the backend consist mainly of one message,
 which should rather be on debug than info level:
 {{{
 INFO o.t.m.e.QueryServlet:315 Returned a database connection to the pool
 after 105 millis.
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24542>
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