[tor-bugs] #1841 [Metrics]: Implement node churn and uptime statistics (was: Node churn and uptime statistics)

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#1841: Implement node churn and uptime statistics
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 Reporter:  kjbbb    |       Owner:  karsten 
     Type:  task     |      Status:  assigned
 Priority:  normal   |   Milestone:          
Component:  Metrics  |     Version:          
 Keywords:           |      Parent:          
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Changes (by karsten):

  * status:  new => assigned


Comment:

 We should merge this code into metrics-db. As discussed on #tor-dev today,
 Kevin is going to cherry-pick/interactively rebase his development branch
 to come up with a branch that implements just the churn and uptime
 statistics.

 Here's also an idea for graphing churn and uptime: I found it useful to
 visualize uptime sessions using empirical cumulative distribution
 functions, like in
 [https://trac.torproject.org/projects/tor/attachment/ticket/1721/relay-
 uptime-ecdf.png this graph on uptime sessions by platforms]. ECDFs are not
 built into ggplot2 directly, so one has to transform the data manually and
 draw a line plot of them. Here's an example:

 library(ggplot2)
 t <- rnorm(1000)
 ts <- sort(t)
 data <- data.frame(x = ts, y = (1:length(ts)) / length(ts))
 ggplot(data) + geom_line(aes(x=x,y=y))

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1841#comment:1>
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