title: What is the default retention period for LogGroup in Cloud Watch?
body: <p><a href="http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-logs-loggroup.html" rel="nofollow noreferrer">Here</a> is documentation about creating Cloud Watch <code>LogGroup</code> via Cloud Formation. They said:</p>
  
  <blockquote>
    <p>RetentionInDays</p>
    
    <p>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.</p>
    
    <p>Required: No</p>
  </blockquote>
  
  <p>So if I create LogGroup without <code>RetentionInDays</code> parameter will Cloud Watch keep those logs forever? Or what <code>RetentionInDays</code> value they use by default?</p>