Question:
Here is documentation about creating Cloud Watch LogGroup via Cloud Formation. They said:
RetentionInDays
The number of days log events are kept in CloudWatch
Logs. When a log event expires, CloudWatch Logs automatically deletes
it. For valid values, see PutRetentionPolicy in the Amazon CloudWatch
Logs API Reference.Required: No
So if I create LogGroup without RetentionInDays parameter will Cloud Watch keep those logs forever? Or what RetentionInDays value they use by default?
Answer:
By default, log data is stored in CloudWatch Logs indefinitely. However, you can configure how long to store log data in a log group. Any data older than the current retention setting is automatically deleted. You can change the log retention for each log group at any time.
Source :- http://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/SettingLogRetention.html