code: def handler(event, context):  # pylint: disable=unused-argument
      """Entry point for the alert merger."""
      AlertMerger.get_instance().dispatch()
  
file_path: streamalert/streamalert/alert_merger/main.py
imports: from datetime import datetime
  import json
  import os
  import boto3
  from streamalert.shared.alert import Alert, AlertCreationError
  from streamalert.shared.alert_table import AlertTable
  from streamalert.shared.logger import get_logger
  from streamalert.shared.metrics import ALERT_MERGER_NAME, MetricLogger
label_desc: Use image node_id 1 for calling a global function with example usage: handler(event, context) without return types