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Why is this an issue?
If the region is not specified when creating a new AwsClient with an AwsClientBuilder, the AWS SDK
will execute some logic to identify the endpoint automatically.
While it will probably identify the correct one, this extra logic will slow down startup time, already known to be a hotspot.
You should therefore always define the logic to set the region yourself. This is typically done by retrieving the region from the Lambda provided
AWS_REGION environment variable.
This will make the code more explicit and spare initialization time.
This rule reports an issue when the region is not set when creating an AwsClient.
Noncompliant code example
S3Client.builder()
    .credentialsProvider(EnvironmentVariableCredentialsProvider.create())
    .build();

Compliant solution
S3Client.builder()
    .region(Region.of(System.getenv(SdkSystemSetting.AWS_REGION.environmentVariable()))
    .credentialsProvider(EnvironmentVariableCredentialsProvider.create())
    .build();

Resources

   Tuning the AWS Java SDK 2.x to reduce
  startup time 
   Optimizing cold start performance for
  AWS Lambda 
   Environment variable configuration 
   Automatically Determine the AWS Region