A Config rule that checks whether your Auto Scaling groups that are associated with a load balancer are using Elastic Load Balancing health checks.

CloudFormation Template

AWSTemplateFormatVersion: '2010-09-09'
Description: Check EC2 Auto Scaling groups use ELB health checks
Resources:
  ConfigRule:
    Type: 'AWS::Config::ConfigRule'
    Properties:
      ConfigRuleName: "autoscaling-group-elb-healthcheck-required"
      Description: "Checks if your Amazon EC2 Auto Scaling groups that are associated with a Classic Load Balancer use Elastic Load Balancing health checks. The rule is NON_COMPLIANT if the Amazon EC2 Auto Scaling groups are not using Elastic Load Balancing health check.."
      Source:
        Owner: "AWS"
        SourceIdentifier: "AUTOSCALING_GROUP_ELB_HEALTHCHECK_REQUIRED"
      Scope:
        ComplianceResourceTypes:
          - "AWS::AutoScaling::AutoScalingGroup"