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Hello,
The rate at which you gather data is also going to determine the data retention period.
One minute data points are available for 15 days.
Five minute data points are available for 63 days.
One hour data points are available for 455 days (15 months).
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Thanks for sharing this!
I've found the article in AWS docs - https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_GetMetricStatistics.html. And it says that: "Data points that are initially published with a shorter period are aggregated together for long-term storage. For example, if you collect data using a period of 1 minute, the data remains available for 15 days with 1-minute resolution. After 15 days, this data is still available, but is aggregated and retrievable only with a resolution of 5 minutes. After 63 days, the data is further aggregated and is available with a resolution of 1 hour."
Should I make additional config for the CWAgent to enable this additional aggregation?
The additional aggregation you are talking about is going to aggregate metric data and is going to send it to Cloudwatch as a single metric. If you want to have this functionality:
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Agent-common-scenarios.html#CloudWatch-Agent-aggregating-metrics
Else CW is going to automatically aggregate data to higher granularities.