[tor-bugs] #21087 [Metrics/CollecTor]: What is @source?

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#21087: What is @source?
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 Reporter:  atagar             |          Owner:  metrics-team
     Type:  defect             |         Status:  new
 Priority:  Medium             |      Milestone:
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:  metrics-help       |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by iwakeh):

 Maybe, I overlooked something, just point me there:  where does the
 `@source` come from?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21087#comment:2>
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