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rubygnome

It's a standard public google drive spreadsheet. you should be able to see it without signing in.
Re:We Analyzed 30K GitHub Projects: Top Libraries in Java, JS, Ruby on Wednesday November 20, 2013 @10:35AM (#6768571)
The results are biased towards favorited projects because it's a good indication of their perceived importance by the GitHub community.
The log links don't send the full stack for every log line, only for the ones with fatal errors. moreover, the log links pace is controlled, so if your system "chokes" on logs, Takipi will lower the links rate, so they'll only appear when an "interesting" error occurs, i.e new/unfamiliar errors, or ones that provide you with new information.