Amazon CloudWatch Logs
Research and Engineering Studio creates the following log groups in CloudWatch during installation. See the following table for default retentions:
| CloudWatch Log groups | Retention | 
|---|---|
| /aws/lambda/ | Never expire | 
| /aws/lambda/ | Never expire | 
| /aws/lambda/ | Never expire | 
| /aws/lambda/ | Never expire | 
| /aws/lambda/ | Never expire | 
| /aws/lambda/ | Never expire | 
| /aws/lambda/ | Never expire | 
| /aws/lambda/ | Never expire | 
| / | 3 months | 
| / | 3 months | 
| / | 3 months | 
| / | 3 months | 
If you would like to change the default retention for a log group, you can go to the 
            CloudWatch console