[outputs.cloudwatch] PutMetricsData payload is too large

[tory-kk]

Relevant telegraf.conf

[[outputs.cloudwatch]]
  metric_batch_size = 1000 (default)

Logs from Telegraf

[outputs.cloudwatch] Unable to write to CloudWatch : operation error CloudWatch: PutMetricData, https response error StatusCode: 413

System info

Telegraf 1.28.3+ (up to master that is 1.33.0 now)

Docker

No response

Steps to reproduce

Was able to get an error with the default value of metric_batch_size and 10 dimensions for each metric

Expected behavior

CloudWatch output plugin splits metrics for batches by size in addition to count

Actual behavior

CloudWatch output plugin splits metrics for batches only by count (

telegraf/plugins/outputs/cloudwatch/cloudwatch.go

Lines 191 to 193 in a72550a

	// PutMetricData only supports up to 1000 data metrics per call
	// https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_PutMetricData.html
	const maxDatumsPerCall = 1000

) while AWS documentation (https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_PutMetricData.html) says that request is also limited to 1 MB

Additional info

No response