Get N measurements for a Librato metric using the Ruby wrapper (and do some calcs)

get_all_measurements.rb

require 'librato/metrics'

Librato::Metrics.authenticate 'justin@example.com', 'token'

months_ago = 2
metric_name = 'AWS.EC2.CPUUtilization'
resolution = 84600 # Daily
source_matcher = "us-east-1*" # Set to nil for all sources

next_time = Time.now.to_i - (months_ago * 730 * 3600)

results = {}

while next_time
  puts "Querying for: #{next_time}"
  
  opts = {start_time: next_time, resolution: resolution}
  opts.merge!(source: source_matcher) if source_matcher

  if resp = Librato::Metrics.get_metric(metric_name, opts)
    next_time = resp['query'] ? resp['query']['next_time'] : nil
    resp['measurements'].each do |source, measurements|
      if results[source]
        results[source] << measurements
        results[source].flatten!
      else
        results[source] = measurements
      end
    end
  else 
    next_time = nil
  end
end

# Calc "average of average" for each source, for example
results.each do |source, measurements|
  avg_of_avg = measurements.map {|m| m['value']}.reduce(:+) / measurements.size.to_f
  puts "#{source}: #{avg_of_avg}"
end;nil