[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 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.

 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.

 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`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21378#comment:8>
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