instrument

# File activesupport/lib/active_support/cache.rb, line 542
        def instrument(operation, key, options = nil)
          log(operation, key, options)

          payload = { :key => key }
          payload.merge!(options) if options.is_a?(Hash)
          ActiveSupport::Notifications.instrument("cache_#{operation}.active_support", payload){ yield(payload) }
        end