def lambda_handler()

in src/ASGMonitoring/app.py [0:0]

• 13 lines of code
• 6 McCabe index (conditional complexity)

def lambda_handler(event, context):

    # show the response
    logger.info(event)

    # get our ASG client
    client = boto3.client('autoscaling')

    # get the list of autoscaling groups
    resp = client.describe_auto_scaling_groups()

    # if the ASG is created by Batch enable metrics collection
    for g in resp['AutoScalingGroups']:
        try:
            x = g['MixedInstancesPolicy']['LaunchTemplate']['LaunchTemplateSpecification']['LaunchTemplateName']

        except Exception:
            logger.info(f"Cannot add metrics collection for {g['AutoScalingGroupName']}")

        if 'Batch-lt' in x and 'EnabledMetrics' in g:
            # in our case we add all the metrics but you could select the ones of interest
            # don't forget to check and update your dashboards should you change the metrics
            # https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-instance-monitoring.html
            r = client.enable_metrics_collection(AutoScalingGroupName=g['AutoScalingGroupName'], Granularity='1Minute')
            logger.info(f"Enabled metrics collection on {g['AutoScalingGroupName']}")

    return