[tor-bugs] #30719 [Core Tor/sbws]: Work out why 90% of sbws measurements fail

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#30719: Work out why 90% of sbws measurements fail
-------------------------------+-------------------------------
     Reporter:  teor           |      Owner:  (none)
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  sbws: unspecified
    Component:  Core Tor/sbws  |    Version:  sbws: unspecified
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:  #29710
       Points:                 |   Reviewer:
      Sponsor:                 |
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 longclaw's most recent vote shows that 90% of measurement attempts fail:
 recent_measurement_failure_count is 299K, and
 recent_measurement_attempt_count is 327K.

 We should work out why sbws is doing so many failing measurements.

 {{{
 bandwidth-file-headers timestamp=1559442886 version=1.4.0
 destinations_countries=ZZ earliest_bandwidth=2019-05-28T02:35:11
 file_created=2019-06-02T02:35:03 generator_started=2019-05-19T14:04:34
 latest_bandwidth=2019-06-02T02:34:46 minimum_number_eligible_relays=3934
 minimum_percent_eligible_relays=60 number_consensus_relays=6556
 number_eligible_relays=6287 percent_eligible_relays=96
 recent_consensus_count=120 recent_measurement_attempt_count=327183
 recent_measurement_failure_count=299072
 recent_measurements_excluded_error_count=876
 recent_measurements_excluded_few_count=678
 recent_measurements_excluded_near_count=237
 recent_measurements_excluded_old_count=0 recent_priority_list_count=991
 recent_priority_relay_count=327183 scanner_country=US software=sbws
 software_version=1.1.0 time_to_report_half_network=225229
 bandwidth-file-digest sha256=UkxK9KS5KZ5hKDiLI3bqGoMvpMW9gBjKGoYbD2bdZVE
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30719>
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