[metrics-bugs] #27074 [Metrics/Website]: Metrics does not render graphs

[Tor Bug Tracker & Wiki]

#27074: Metrics does not render graphs
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     Reporter:  cKKuzt3QCP7R4CuQ3ujP  |      Owner:  metrics-team
         Type:  defect                |     Status:  new
     Priority:  Medium                |  Milestone:
    Component:  Metrics/Website       |    Version:
     Severity:  Normal                |   Keywords:  metrics graph
Actual Points:                        |  Parent ID:
       Points:                        |   Reviewer:
      Sponsor:                        |
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 The metrics page for any relay I've looked at shows "No Data Available"
 for both graphs for the last couple of weeks. Same behaviour for and time
 range on the graphs. It displayed correctly before. I've tried on
 chromium, firefox, and android firefox.

 In the debug console, I see the follow javascript errors that look
 relevant:
 graph.js?v29:41 Uncaught TypeError: history[period].first.split is not a
 function
     at graph.js?v29:41
     at Function._.each._.forEach (underscore-min.js?v29:153)
     at parseWeightHistory (graph.js?v29:40)
     at n.parse_weights_data (graph.js?v29:159)
     at success (main.js?v29:199)
     at Object.success (graph.js?v29:148)
     at i (jquery-3.2.1.min.js?v29:2)
     at Object.fireWith [as resolveWith] (jquery-3.2.1.min.js?v29:2)
     at A (jquery-3.2.1.min.js?v29:4)
     at XMLHttpRequest.<anonymous> (jquery-3.2.1.min.js?v29:4)

 graph.js?v29:12 Uncaught TypeError: history[period].first.split is not a
 function
     at graph.js?v29:12
     at Function._.each._.forEach (underscore-min.js?v29:153)
     at parseHistory (graph.js?v29:11)
     at n.parse_bw_data (graph.js?v29:128)
     at success (main.js?v29:183)
     at Object.success (graph.js?v29:118)
     at i (jquery-3.2.1.min.js?v29:2)
     at Object.fireWith [as resolveWith] (jquery-3.2.1.min.js?v29:2)
     at A (jquery-3.2.1.min.js?v29:4)
     at XMLHttpRequest.<anonymous> (jquery-3.2.1.min.js?v29:4)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27074>
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