[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                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:
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Description changed by cohosh:

Old description:

> 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

New description:

 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
 - #29207
 - #25985

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30704#comment:2>
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