Amazon CloudWatch now provides more metric data, faster, with GetMetricData quota increase
You can now retrieve more metric data from Amazon CloudWatch, faster. The quota for the bulk metric retrieval service GetMetricData has increased from 100 to 500 metrics per request. Additionally, the datapoints per second (DPS) quota for retrieving data more than 3 hours old has been increased from 90,000 to 396,000.
Source:: Amazon AWS