def timing(description, duration, params = {})
      Gateway.timing(stat(description), duration, gateway_params(params))
    end
def timing(description, duration, params = {})
      Gateway.timing(stat(description), duration, gateway_params(params))
    end
Record the time (in ms) when the code has already been executed. Useful for
 ActiveSupport::Instrumentation event.duration (which is already in ms)