[metrics-bugs] #21370 [Metrics/Onionoo]: Onionoo should be more robust against unexpected data

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#21370: Onionoo should be more robust against unexpected data
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     Reporter:  iwakeh           |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 Copied from comment 15 in #20440:
   Onionoo should be a little more robust against unexpected data in the
 `in/archive/` directory.  It could simply skip the unrecognized descriptor
 and carry on with the next descriptor.  That's `s/break/continue/` in
 [https://gitweb.torproject.org/onionoo.git/tree/src/main/java/org/torproject/onionoo/updater/DescriptorSource.java#n213
 this line].

 Good idea!

 This also needs a test implementation and at least a change to the log
 statement that just one descriptor is skipped.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21370>
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