code: def anitya_unmapped_new_update(config, message):
      
      if not anitya_new_update(config, message):
          return False
  
      for package in message['msg']['message']['packages']:
          if package['distro'].lower() == 'fedora':
              return False
  
      # If none of the packages were listed as Fedora, then this is unmapped.
      return True
docs: New releases of upstream projects that have no mapping to Fedora
  
      Adding this rule will let through events when new upstream releases are
      detected, but only on upstream projects that have no mapping to Fedora
      Packages.  This could be useful to you if you want to monitor
      release-monitoring.org itself and watch for projects that might need help
      adjusting their metadata.