in rspec_stats/rspec_stats.rb [59:72]
def merge_requests_data
min_day = overall_data_by_day.keys.min
all_mrs = MergeRequest.fetch(since: min_day)
by_day = all_mrs.group_by(&:day)
bars = by_day.map do |date, mrs|
{ x: date, y: mrs.size }
end
JSON.generate(bars)
end