[tor-bugs] #30704 [Circumvention/Snowflake]: Plan for snowflake update versioning and backwards compatability

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#30704: Plan for snowflake update versioning and backwards compatability
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     Reporter:  cohosh                   |      Owner:  (none)
         Type:  task                     |     Status:  new
     Priority:  Medium                   |  Milestone:
    Component:  Circumvention/Snowflake  |    Version:
     Severity:  Normal                   |   Keywords:
Actual Points:                           |  Parent ID:
       Points:                           |   Reviewer:
      Sponsor:                           |
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 We have some upcoming changes that will change the way snowflake
 components talk to each other. We should decide (and possibly on a case-
 by-case basis) how to handle these updates.
 - Do we make sure changes are backwards compatible with clients/proxies
 that haven't updated yet?
 - Should we think about introducing some concept of versioning?
 - If we support older versions, how long until we no longer support them?

 Some examples of tickets that we'll need to think about this for:
 - 25429
 - 29206
 - #25985

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30704>
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