public String getSource() {
        return this.source;
    }
<p>
The source Region (like <code>us-east-1</code>) or Availability Zone ID (like <code>use1-az1</code>) that the
metric subscription is enabled for. If you use Availability Zone IDs, the Source and Destination Availability
Zones must be in the same Region.
</p>

@return The source Region (like <code>us-east-1</code>) or Availability Zone ID (like <code>use1-az1</code>) that
        the metric subscription is enabled for. If you use Availability Zone IDs, the Source and Destination
        Availability Zones must be in the same Region.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/EnableAwsNetworkPerformanceMetricSubscriptionRequest.java