var input = JSON.parse(value),
	output = [];

input.forEach(function (sensor) {
	sensor.metrics.forEach(function (metric) {
		output.push(
			{
				'{#SENSOR_ID}': sensor.id,
				'{#SENSOR_NAME}': sensor.name,
				'{#GATEWAY_ID}': sensor.gateway.id,
				'{#GATEWAY_NAME}': sensor.gateway.name,
				'{#METRIC}': metric.name,
				'{#UNIT}': metric.unit
			}
		);
	})
});

return JSON.stringify(output);