# File lib/new_relic/agent/transaction.rb, line 219
      def self.apdex_bucket(duration, failed, apdex_t)
        case
        when failed
          :apdex_f
        when duration <= apdex_t
          :apdex_s
        when duration <= 4 * apdex_t
          :apdex_t
        else
          :apdex_f
        end
      end