[metrics-bugs] #21378 [Metrics/CollecTor]: Archive bwauth bandwidth files

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#21378: Archive bwauth bandwidth files
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 Reporter:  tom                     |          Owner:  metrics-team
     Type:  enhancement             |         Status:  new
 Priority:  Low                     |      Milestone:
Component:  Metrics/CollecTor       |        Version:
 Severity:  Normal                  |     Resolution:
 Keywords:  tor-bwauth tor-dirauth  |  Actual Points:
Parent ID:                          |         Points:
 Reviewer:                          |        Sponsor:
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Comment (by teor):

 Replying to [comment:9 teor]:
 > Replying to [comment:8 irl]:
 > > Using the fixed URL ​http://<hostname>/tor/status-
 vote/next/bandwidth.z sounds like it would be very easy to add this to
 CollecTor.
 >
 > Thanks for the feedback!
 >
 > > We have discussed in the Metrics team extending `dir-spec.txt` to
 allow to fetch "recent" files as well as just next/current. In the case
 that there is a wide CollecTor outage, and we miss a file, it would be
 good to have those files cached (on a best-effort basis, not necessarily
 persisted to disk) and available via some URL.
 >
 > How is this any different to losing descriptors or consensuses?
 > (Please answer this question on a separate ticket.)
 >
 > > I don't know if karsten already had some ideas about what these URLs
 would look like, but we should perhaps consider this before implementing
 changes to `dir-spec.txt`.
 >
 > Please open a separate ticket for this feature. It's potentially a large
 feature. And it's not essential for the initial release of this feature.

 If you open a separate ticket for historical directory documents, please
 make #26698 a child of that ticket. We'll need bandwidth file hashes to
 work out the exact file used in each vote.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21378#comment:12>
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