Amazon CloudWatch allows you do bulk transformations in just single expression

Now you can perform a bulk transformation in a single expression with the latest support that is added by Amazon Web Services to Amazon CloudWatch Metric Math. Metrics rate of change over time can also be calculated which will make it convenient for the customers to perform a calculation on various metrics for real-time analysis. You can query multiple CloudWatch metrics with Metric Math and also you can use the expressions to create new time series which will be based on the metrics. The compute metric can be visualized via Amazon CloudWatch Dashboards, AWS Console and you can retrieve them through GetMetricData API. With GetMetricData you can retrieve 100 different metrics in just as single request with many as 100,800 data points.