# LiveTailSessionStart
<a name="API_LiveTailSessionStart"></a>

This object contains information about this Live Tail session, including the log groups included and the log stream filters, if any.

## Contents
<a name="API_LiveTailSessionStart_Contents"></a>

 ** logEventFilterPattern **   <a name="CWL-Type-LiveTailSessionStart-logEventFilterPattern"></a>
An optional pattern to filter the results to include only log events that match the pattern. For example, a filter pattern of `error 404` displays only log events that include both `error` and `404`.  
For more information about filter pattern syntax, see [Filter and Pattern Syntax](https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/FilterAndPatternSyntax.html).  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 1024.  
Required: No

 ** logGroupIdentifiers **   <a name="CWL-Type-LiveTailSessionStart-logGroupIdentifiers"></a>
An array of the names and ARNs of the log groups included in this Live Tail session.  
Type: Array of strings  
Array Members: Minimum number of 1 item. Maximum number of 10 items.  
Length Constraints: Minimum length of 1. Maximum length of 2048.  
Pattern: `[\w#+=/:,.@-]*`   
Required: No

 ** logStreamNamePrefixes **   <a name="CWL-Type-LiveTailSessionStart-logStreamNamePrefixes"></a>
If your StartLiveTail operation request included a `logStreamNamePrefixes` parameter that filtered the session to only include log streams that have names that start with certain prefixes, these prefixes are listed here.  
Type: Array of strings  
Array Members: Minimum number of 1 item. Maximum number of 100 items.  
Length Constraints: Minimum length of 1. Maximum length of 512.  
Pattern: `[^:*]*`   
Required: No

 ** logStreamNames **   <a name="CWL-Type-LiveTailSessionStart-logStreamNames"></a>
If your StartLiveTail operation request included a `logStreamNames` parameter that filtered the session to only include certain log streams, these streams are listed here.  
Type: Array of strings  
Array Members: Minimum number of 1 item. Maximum number of 100 items.  
Length Constraints: Minimum length of 1. Maximum length of 512.  
Pattern: `[^:*]*`   
Required: No

 ** requestId **   <a name="CWL-Type-LiveTailSessionStart-requestId"></a>
The unique ID generated by CloudWatch Logs to identify this Live Tail session request.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 256.  
Required: No

 ** sessionId **   <a name="CWL-Type-LiveTailSessionStart-sessionId"></a>
The unique ID generated by CloudWatch Logs to identify this Live Tail session.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 256.  
Required: No

## See Also
<a name="API_LiveTailSessionStart_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/logs-2014-03-28/LiveTailSessionStart) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/logs-2014-03-28/LiveTailSessionStart) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/logs-2014-03-28/LiveTailSessionStart)