[metrics-bugs] #34240 [Internal Services/Tor Sysadmin Team]: Update Metrics CollecTor check to remove Torperf files

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#34240: Update Metrics CollecTor check to remove Torperf files
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     Reporter:  karsten                              |      Owner:  tpa
         Type:  task                                 |     Status:  new
     Priority:  Medium                               |  Milestone:
    Component:  Internal Services/Tor Sysadmin Team  |    Version:
     Severity:  Normal                               |   Keywords:
Actual Points:                                       |  Parent ID:
       Points:                                       |   Reviewer:
      Sponsor:                                       |
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 We stopped archiving Torperf files in #34141, and now the check starts
 complaining about them not being recent anymore: `CRITICAL: Got a valid
 response from https://collector.torproject.org/index/index.json with at
 least one timestamp being critically outdated: /recent/torperf/ =
 2020-05-16 00:10 (33 = 30 + 3 hours ago)`

 I'm attaching a patch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34240>
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