[metrics-bugs] #21759 [Metrics/CollecTor]: Add persistence for torperf/onionperf

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#21759: Add persistence for torperf/onionperf
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     Reporter:  iwakeh             |      Owner:  metrics-team
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 As discussed in
 [https://trac.torproject.org/projects/tor/ticket/21272#comment:18 #21272
 comment:18] and before.

 All storing of files should be done by the persist-mechanism, i.e.,
 a o.t.c.persist.TpfPersistence class needs to be introduced (this would
 shorten TorperfDownloader quite a bit and prevent another
 re-implementation of this functionality).

 Decide if sync-functionality for the Xperf files can be done with this
 ticket, too, or needs another ticket.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21759>
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