[tor-bugs] #30196 [Core Tor/sbws]: Add the tor version to the sbws bandwidth file header

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#30196: Add the tor version to the sbws bandwidth file header
---------------------------+-----------------------------------
 Reporter:  teor           |          Owner:  (none)
     Type:  enhancement    |         Status:  new
 Priority:  Medium         |      Milestone:  sbws: 1.2.x-final
Component:  Core Tor/sbws  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:                 |  Actual Points:
Parent ID:  #30255         |         Points:  1
 Reviewer:                 |        Sponsor:
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Comment (by teor):

 Replying to [comment:4 teor]:
 > Replying to [comment:1 irl]:
 > > For exit lists we are considering using a free-form text field with
 some suggested formats, e.g. something like "ExitScanner 55.5 using Tor
 1.0.0 on Windows 10". If there is later something that affects the
 specific implementation we can adjust that string without a spec change to
 report library details.
 >
 > Unstructured text is a nightmare to parse. Just look at the browser
 user-agent. Or the Tor ContactInfo field.
 >
 > If we need something, let's specify it as a separate header.
 > If we're not sure, then let's leave it out.

 Replying to [comment:4 teor]:
 > Replying to [comment:1 irl]:
 > > There is also an implicit assumption here that the bandwidth scanner
 uses tor at all. A future bandwidth scanner implementation may use
 `stem.client` or an alternative implementation.
 >
 > Most headers are optional. We can specify that if there's no tor, then
 the tor version header SHOULD NOT be present.

 Replying to [comment:5 juga]:
 > Replying to [comment:4 teor]:
 > > * we wanted to know the tor version to recommend tor upgrades to
 bandwidth authority operators (#30184)
 >
 > easy.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30196#comment:8>
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