[metrics-bugs] #24470 [Metrics/Analysis]: Distinguish point events from ongoing events in metrics timeline

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#24470: Distinguish point events from ongoing events in metrics timeline
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     Reporter:  dcf               |      Owner:  metrics-team
         Type:  enhancement       |     Status:  new
     Priority:  Medium            |  Milestone:
    Component:  Metrics/Analysis  |    Version:
     Severity:  Normal            |   Keywords:  metrics-timeline
Actual Points:                    |  Parent ID:
       Points:                    |   Reviewer:
      Sponsor:                    |
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 The metrics timeline does not distinguish entries that represent a single
 point in time from those that started but have not finished yet. They both
 are represented by a non-empty `start date` column and an empty `end date`
 column. For example (some columns omitted):
 ||=start date =||=end date =||=description =||
 ||2017-10-05 || ||geoip database updated. ||
 ||2017-10-07 || ||Increase of users in Romania. ||

 We need to disambiguate these two cases for the sake of uses like #24260,
 which wants to present date ranges as text.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24470>
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