[metrics-bugs] #25091 [Metrics/Onionoo]: Make 'out/update' deterministic across instances

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#25091: Make 'out/update' deterministic across instances
-----------------------------+------------------------------
 Reporter:  iwakeh           |          Owner:  metrics-team
     Type:  enhancement      |         Status:  closed
 Priority:  Medium           |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Normal           |     Resolution:  wontfix
 Keywords:                   |  Actual Points:  0.1
Parent ID:  #25002           |         Points:
 Reviewer:                   |        Sponsor:
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Changes (by karsten):

 * status:  new => closed
 * resolution:   => wontfix
 * actualpoints:   => 0.1


Comment:

 Or let's not do it. I already had a working patch, but then realized that
 the timestamp in `out/update` is used for different two purposes: 1) for
 `server.NodeIndexer` to quickly check whether there's new data to index
 and 2) for the various `writer.*DocumentWriter` to obtain a list of status
 files that were written or updated after the last execution. We cannot
 simply use the maximum last-seen time as timestamp in the `out/update`
 file, or we'd rewrite lots of document files from status files that
 haven't changed. We could have two separate files `status/update` and
 `out/update` for the two different purposes. But is that really worth the
 effort, just to make `out/update` deterministic across instances? I don't
 think so. Closing as wontfix.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25091#comment:1>
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