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The size of a PutMetricData request of CloudWatch is limited to 8KB for the HTTP GET requests and 40KB for the HTTP POST requests. The user can include a maximum of 20 data points in one PutMetricData request. Reference: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html
PutMetricData request
40 KB for HTTP POST requests. PutMetricData can handle 150 transactions per second (TPS), which is the maximum number of operation requests you can make per second without being throttled.
You can request a quota increase
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_limits.html
I think there is an error in the question and answer
Each PutMetricData request is limited to 40 KB in size for HTTP POST requests. Each request is also limited to no more than 20 different metrics.
You can publish either individual data points in the Value field, or arrays of values and the number of times each value occurred during the period by using the Values and Counts fields in the MetricDatum structure. Using the Values and Counts method enables you to publish up to 150 values per metric with one PutMetricData request, and supports retrieving percentile statistics on this data.
https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_PutMetricData.html
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