[tor-bugs] #18818 [CollecTor]: Stop using deprecated parts of metrics-lib.

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#18818: Stop using deprecated parts of metrics-lib.
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     Reporter:  karsten      |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  CollecTor    |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |   Reviewer:
      Sponsor:               |
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 We're currently using two metrics-lib types that have been deprecated:
  - `org.torproject.descriptor.impl.DescriptorParseException` and
  - `org.torproject.descriptor.ExitListEntry`.

 It's easy to avoid using those parts and move to non-deprecated types.
 That would also remove the last dependency on a type in the impl package.
 Will provide a branch shortly (once I have a ticket number).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18818>
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