[tor-bugs] #31493 [Circumvention/Snowflake]: Add a version to the metrics output

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#31493: Add a version to the metrics output
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 Reporter:  cohosh                   |          Owner:  cohosh
     Type:  defect                   |         Status:  needs_review
 Priority:  Medium                   |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:  Sponsor28
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Comment (by karsten):

 In dir-spec, lines starting with `@` are treated as annotations that
 ''precede'' a descriptor and that can be stripped off without changing the
 descriptor. Including such a line inside a descriptor might be
 problematic.

 But after reading this ticket and #29461, I wonder if my suggestion to add
 a version number was bad advice. After all, we already have `snowflake-
 stats-end` in the first line as unique identifier of this descriptor type.
 And if something in the data format changes, there will be a specification
 update introducing new lines anyway. It's probably not worth the effort to
 update existing specification, implementation, and data to add something
 that we probably won't need. Can I take this suggestion back and we leave
 the format unchanged? (Sorry!!)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31493#comment:5>
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