code: def function_map():
      """Provide a map of CLI function name to their expected actual function suffix
  
      Returns:
          dict: Mapping of CLI function name to expected actual function suffix
      """
      # This is purposely not a constant because it is expected to be modifiable
      return {
          "alert": "alert_processor",
          "alert_merger": "alert_merger",
          "apps": None,  # needs special handling
          "athena": "athena_partitioner",
          "classifier": None,  # needs special handling
          "rule": "rules_engine",
          "rule_promo": "rule_promotion",
          "scheduled_queries": "scheduled_queries_runner",
          "threat_intel_downloader": "threat_intel_downloader",
      }
  
imports: from abc import abstractmethod
  from argparse import _AppendAction, Action, ArgumentTypeError, RawDescriptionHelpFormatter
  import os
  import textwrap
  from streamalert.apps.config import AWS_RATE_RE, AWS_RATE_HELPER
label_desc: Use image node_id 1 for calling a global function with example usage: function_map() and returns: dict