[tor-bugs] #2646 [Metrics]: Warn when we less than 3 bandwidth scanners are running

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#2646: Warn when we less than 3 bandwidth scanners are running
-------------------------+--------------------------------------------------
 Reporter:  karsten      |          Owner:  karsten
     Type:  enhancement  |         Status:  new    
 Priority:  normal       |      Milestone:         
Component:  Metrics      |        Version:         
 Keywords:               |         Parent:         
   Points:               |   Actualpoints:         
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 We should try harder to keep at least 3 bandwidth scanners running, or
 clients won't make use of the available bandwidth capacity.

 See [https://lists.torproject.org/pipermail/tor-
 relays/attachments/20110302/ea2efe3e/attachment-0001.png this graph] from
 blutmagie for what happens when 2 or more of our bandwidth scanners are
 failing.

 I'm going to implement a check in metrics-web to warn me when less than 3
 directory authorities report measured bandwidth values in their votes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2646>
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