[tor-bugs] #1846 [Metrics]: Use Rserve and servlets to display custom graphs

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#1846: Use Rserve and servlets to display custom graphs
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 Reporter:  karsten  |       Owner:  karsten
     Type:  task     |      Status:  new    
 Priority:  normal   |   Milestone:         
Component:  Metrics  |     Version:         
 Keywords:           |      Parent:         
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 Part of Kevin's GSoC project was to employ Rserve and servlets to allow
 users to customize graphs. The current servlet accepts as parameters start
 and end date, sends a request to produce a graph to Rserve, and returns
 the graph bytes (or an error code) to the client. Further, there's a
 dynamic graph page containing an HTML form for users to request a graph.

 As discussed on #tor-dev today, we are merging Kevin's code into metrics-
 web. Further discussion of the merging will take place here.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1846>
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