[tor-bugs] #27338 [Core Tor/sbws]: How long should sbws keep measured and observed bandwidths?

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#27338: How long should sbws keep measured and observed bandwidths?
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     Reporter:  teor           |      Owner:  (none)
         Type:  task           |     Status:  new
     Priority:  Medium         |  Milestone:  sbws 1.0 (MVP must)
    Component:  Core Tor/sbws  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:  #27108
       Points:                 |   Reviewer:
      Sponsor:                 |
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 In #27135, sbws starts keeping observed bandwidths for relays:

 > > Taking the descriptor observed bandwidth only when the relay is
 measured and calculating the mean when there're several observed bandwidth
 values for the same relay

 Here are some options:
 * use the latest measured and observed bandwidth
 * take the latest measured and observed bandwidth every hour, and
   - average the last N days of bandwidths
   - apply an exponentially decaying average to all bandwidths

 We need to decide which strategy to use, update the bandwidth file spec,
 and implement this feature in sbws.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27338>
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