[tor-bugs] #29365 [Metrics/Onionperf]: Add digests and sizes to index.xml

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#29365: Add digests and sizes to index.xml
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     Reporter:  irl                |      Owner:  hiro
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:  Sponsor13          |
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 To allow CollecTor to know if it's downloaded the file successfully, add a
 filesize in bytes and a base64-encoded SHA-256 digest to index.xml. For
 some level of future proofing, we could also add a base64-encoded SHA3-256
 digest.

 (Copied from https://github.com/robgjansen/onionperf/issues/43)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29365>
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