[metrics-bugs] #24534 [Metrics/ExoneraTor]: Exonerator is down

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#24534: Exonerator is down
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 Reporter:  atagar              |          Owner:  metrics-team
     Type:  defect              |         Status:  new
 Priority:  High                |      Milestone:
Component:  Metrics/ExoneraTor  |        Version:
 Severity:  Major               |     Resolution:
 Keywords:                      |  Actual Points:
Parent ID:                      |         Points:
 Reviewer:                      |        Sponsor:
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Comment (by iwakeh):

 Further investigation lead to a thread dump with 200 waiting backend
 queries, but no such query thread.
 Logs didn't reveal anything suspicious except very few errors due to weird
 data input (reproducible by entering an ipv6 address with additional
 percent sign number combination).
 In addition, ExoneraTor often is queried more than 3 times per second,
 which is surprising, but not at all a performance problem.
 Thus, a temporary measure can be to simply catch all possible errors and
 then proceed when we catch something.
 Please find a minimal catch-all patch
 [https://gitweb.torproject.org/user/iwakeh/exonerator.git/commit/?h=task-24534
 -debug-
 patch&id=a8bb4babdb0a55e5f78b9d226c59145c16f06bff&context=3&ignorews=1&dt=0
 here] (all changes other than adding try-catch were made to avoid
 checkstyle complaints).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24534#comment:2>
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