[tor-bugs] #22990 [Metrics/Library]: 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:  iwakeh
     Type:  enhancement      |         Status:  needs_review
 Priority:  Medium           |      Milestone:
Component:  Metrics/Library  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  metrics-2017     |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:  iwakeh           |        Sponsor:
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Comment (by karsten):

 Please also review [https://gitweb.torproject.org/user/karsten/metrics-
 lib.git/commit/?h=task-22990&id=39b1242ee01f6a85a204d5d6cf4afa7c6108ce67
 commit 39b1242 in the same branch] with another tweak.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22990#comment:18>
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