[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:  new
 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:                                       |        Sponsor:
                                                 |  Sponsor28
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Comment (by cohosh):

 Replying to [comment:7 karsten]:
 > One quick comment on the spec after writing the metrics-lib part: The
 `"snowflake-stats-end"` line should have multiplicity `"[At start, exactly
 once.]"` rather than `"[At most once.]"`. Other than that, everything
 seemed reasonable from a parsing perspective. (I didn't start with the
 CollecTor part, yet.)
 >
 Thanks! Filed a PR for torspec in #31407 with this change.
 > To answer your earlier question above: having just the last 24 hours of
 data might be problematic if the metrics host goes down for, say, a
 weekend. Ideally, there would be at least a week of statistics available.
 Or maybe just accumulate new statistics forever, given the tiny amount of
 statistics per day.
 Okay great, I have a implementation of this in #31376 that will respond
 with all logged metrics data.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29461#comment:8>
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