→ You can get started with Amazon CloudWatch for free. Most AWS Services (EC2, S3, Kinesis, etc.) vend metrics automatically for free to CloudWatch. Many applications should be able to operate within these free tier limits.
I have just enabled the AWS monitoring and did not do any additional setup/configure at my CheckMK or AWS account for fetching info. I just created an entry in datasource program and choose EC2, RDS for two regions. As per the billing happened to me, just enabling the EC2 in data source program fetches data using “GetMetricData API” for monitoring and this is by default I guess.
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Thanks & Regards,
Y.Leo Simon System Administrator - IT Infrastructure