provider/aws_sd.go
func (p *AWSSDProvider) isAWSLoadBalancer(hostname string) bool {
	return strings.HasSuffix(hostname, sdElbHostnameSuffix)
}
func (p *AWSSDProvider) isAWSLoadBalancer(hostname string) bool {
	return strings.HasSuffix(hostname, sdElbHostnameSuffix)
}
// determine if a given hostname belongs to an AWS load balancer