[metrics-bugs] #29461 [Metrics/CollecTor]: Add a Snowflake module

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#29461: Add a Snowflake module
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 Reporter:  irl                                  |          Owner:
                                                 |  metrics-team
     Type:  enhancement                          |         Status:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:
Component:  Metrics/CollecTor                    |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  metrics-roadmap-august, anti-        |  Actual Points:
  censorship-roadmap-september                   |
Parent ID:                                       |         Points:  8
 Reviewer:  irl                                  |        Sponsor:
                                                 |  Sponsor28
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Comment (by cohosh):

 Replying to [comment:19 karsten]:
 > Replying to [comment:16 karsten]:
 > > Replying to [comment:12 cohosh]:
 > > > Replying to [comment:9 karsten]:
 > > > Thanks karsten!
 > > > >  - As indicated before, I'm using `snowflake-stats-end` as
 descriptor type identifier, which means that future data format versions
 will have to keep that line as their first line. A better choice would
 have been to use something like `snowflake-stats $version` or similar. (If
 it's any relief, we're forced to use `[0-9]{10}` as descriptor type
 identifier for bandwidth files, so there would have been plenty of room to
 do worse.)
 > > > Oh this is a good point. I can make this change pretty easily now.
 > >
 > > Okay, in that case please make this change and let me know where to
 find the new spec and a new sample.
 >
 > cohosh, are you still planning to revise the spec and code to include
 such a `snowflake-stats $version` line?

 Yes, I just got back from vacation and I'm going to implement it this
 afternoon.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29461#comment:22>
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