Are we able to export only parts of the Amazon CloudWatch logs to Amazon S3?
A customer wants to export only parts of the logs from CloudWatch to S3, is there a way to do that?
Reason is that the logGroup is very big and they are only interested in the data for the last months.
Is there a way from AWS to delete older log streams periodically? To save some costs on storage?
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The pattern you describe is quite common, what you want to do is create a subscription filter for your cloudwatch log group.
Ideally this is the pattern [CW Log Group Filter] -->[Kinesis Firehose] -->[Delivery Stream] -->[S3]
Read the following guide for an example:
https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/SubscriptionFilters.html#FirehoseExample
As to your question on a way to periodically delete log streams, CW Log Group retention periods are configurable between 1 day up to 10 years.
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is it mandatory to use both kinesis firehose and datastreams or can we achieve by using one to save cost?