[tor-bugs] #28099 [Core Tor/sbws]: Make a policy for adding new sbws relay keys

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#28099: Make a policy for adding new sbws relay keys
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 Reporter:  teor           |          Owner:  (none)
     Type:  task           |         Status:  new
 Priority:  Medium         |      Milestone:  sbws 1.0 (MVP nice)
Component:  Core Tor/sbws  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:                 |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:                 |        Sponsor:
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Comment (by juga):

 Replying to [ticket:28099 teor]:
 > There are some keys in the spec and the code that are not being used by
 anyone.

 It is what i meant.
 Also, maybe i used wrong the word policy, and i meant any key/value in the
 bandwidth-file-spec, not only in sbws, and not only for the relays, also
 for the header

 >
 > > For instance, do we have tickets of cases where these key/values were
 needed/requested?.
 >
 > When we find this information, we should update the spec so it tells us
 why we need each value.

 Header key example not being used so far: `earliest_bandwidth`. with it we
 know from which time in the past we considered results in the current
 bandwidth file.
 But in which cases we might need to look at that?, when a relay had a very
 different bandwidth 11 days ago and the file `earliest_bandwidth` is 10
 days ago?.
 There was any case in the past (ticket, metrics, irc, ...) where having
 that information would have helped?.
 Maybe we don't need a justification for all key/values, but i think having
 it will also help to understand why it would be useful to archive the file
 and how it can helps to understand the metrics or problems.
 A relay key example is `rtt`. I used it once and generated a graph with
 the bandwidths. With that i could check that all relays' bandwidth were
 slightly faster but the shape of the graph was not changing.
 We are not using it anymore, and the code to obtain it seems to slow down
 a lot `sbws`. If we keep it, do we know for what we might want to use it?.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28099#comment:1>
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