class ElasticAPM::Metrics::Set

def collect
  return if disabled?
  @lock.synchronize do
    metrics.each_with_object({}) do |(key, metric), sets|
      next unless (value = metric.collect)
      # metrics have a key of name and flat array of key-value pairs
      #   eg [name, key, value, key, value]
      # they can be sent in the same metricset but not if they have
      # differing tags. So, we split the resulting sets by tags first.
      name, *tags = key
      sets[tags] ||= Metricset.new
      # then we set the `samples` value for the metricset
      set = sets[tags]
      set.samples[name] = value
      # and finally we copy the tags from the Metric to the Metricset
      set.merge_tags! metric.tags
    end.values
  end
end