[tor-bugs] #28983 [Core Tor/sbws]: Work out how long it takes sbws to measure the network

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#28983: Work out how long it takes sbws to measure the network
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     Reporter:  teor           |      Owner:  (none)
         Type:  enhancement    |     Status:  new
     Priority:  Medium         |  Milestone:
    Component:  Core Tor/sbws  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:                 |   Reviewer:
      Sponsor:                 |
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 In the bandwidth file, sbws should report how long it takes to measure
 (almost all) the entire network.

 Here's one way we could work out the network measurement "half-life":
 1. Count the number of relays in the network, N
 2. Find the last N/2 successful, unique relay measurements
 3. Report how much time has elapsed since the earliest measurement in the
 list
 (We use the half-life, so that failed measurements don't affect the final
 time too much.)

 We could monitor this figure for each scanner, to make sure they are
 working correctly.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28983>
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