[metrics-bugs] #22990 [Metrics/metrics-lib]: Add a heartbeat log message indicating progress and estimated time left

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#22990: Add a heartbeat log message indicating progress and estimated time left
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 Reporter:  karsten              |          Owner:  metrics-team
     Type:  enhancement          |         Status:  new
 Priority:  Medium               |      Milestone:
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by karsten):

 It's probably worth noting that progress is not only a function of reading
 and parsing speed, but also of processing speed of the application. That
 means that we cannot easily say that parsing X bytes of server descriptors
 takes Y minutes. If the application takes a while to process each returned
 descriptor, that delays the overall process. That's why this heartbeat
 would be useful also to debug applications and find bottlenecks.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22990#comment:1>
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