[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):

 Okay I've updated #31493 to use the following spec:
 {{{
 We export metrics in the following (version 1.0) format:

     "snowflake-stats-end" YYYY-MM-DD HH:MM:SS (NSEC s) NL
         [At start, exactly once.]

         YYYY-MM-DD HH:MM:SS defines the end of the included measurement
         interval of length NSEC seconds (86400 seconds by default).

     "@type snowflake-stats 1.0"
         [Exactly once.]

         Defines the version of snowflake stats output being used
         (currently 1.0)

     "snowflake-ips" CC=NUM,CC=NUM,... NL
         [At most once.]

         List of mappings from two-letter country codes to the number of
         unique IP addresses of snowflake proxies that have polled.

 [rest omitted for brevity]
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29461#comment:29>
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