<note> <p>This API operation is superseded by <a>DescribeTrafficSources</a>, which can describe multiple traffic sources types. We recommend using <code>DetachTrafficSources</code> to simplify how you manage traffic sources. However, we continue to support <code>DescribeLoadBalancerTargetGroups</code>. You can use both the original <code>DescribeLoadBalancerTargetGroups</code> API operation and <code>DescribeTrafficSources</code> on the same Auto Scaling group.</p> </note> <p>Gets information about the Elastic Load Balancing target groups for the specified Auto Scaling group.</p> <p>To determine the attachment status of the target group, use the <code>State</code> element in the response. When you attach a target group to an Auto Scaling group, the initial <code>State</code> value is <code>Adding</code>. The state transitions to <code>Added</code> after all Auto Scaling instances are registered with the target group. If Elastic Load Balancing health checks are enabled for the Auto Scaling group, the state transitions to <code>InService</code> after at least one Auto Scaling instance passes the health check. When the target group is in the <code>InService</code> state, Amazon EC2 Auto Scaling can terminate and replace any instances that are reported as unhealthy. If no registered instances pass the health checks, the target group doesn't enter the <code>InService</code> state. </p> <p>Target groups also have an <code>InService</code> state if you attach them in the <a>CreateAutoScalingGroup</a> API call. If your target group state is <code>InService</code>, but it is not working properly, check the scaling activities by calling <a>DescribeScalingActivities</a> and take any corrective actions necessary.</p> <p>For help with failed health checks, see <a href="https://docs.aws.amazon.com/autoscaling/ec2/userguide/ts-as-healthchecks.html">Troubleshooting Amazon EC2 Auto Scaling: Health checks</a> in the <i>Amazon EC2 Auto Scaling User Guide</i>. For more information, see <a href="https://docs.aws.amazon.com/autoscaling/ec2/userguide/autoscaling-load-balancer.html">Use Elastic Load Balancing to distribute traffic across the instances in your Auto Scaling group</a> in the <i>Amazon EC2 Auto Scaling User Guide</i>. </p> <note> <p>You can use this operation to describe target groups that were attached by using <a>AttachLoadBalancerTargetGroups</a>, but not for target groups that were attached by using <a>AttachTrafficSources</a>.</p> </note>