# File lib/new_relic/agent/stats_engine/metric_stats.rb, line 197
        def apply_rules_to_metric_data(rules_engine, stats_hash)
          renamed_stats = NewRelic::Agent::StatsHash.new(stats_hash.started_at)
          stats_hash.each do |spec, stats|
            new_name = rules_engine.rename(spec.name)
            unless new_name.nil?
              new_spec = NewRelic::MetricSpec.new(new_name, spec.scope)
              renamed_stats[new_spec].merge!(stats)
            end
          end
          renamed_stats
        end