class_docstr: A class contains matchers for AWS GuardDuty service
code: def guard_duty(cls, rec):
      return rec["detail-type"] == "GuardDuty Finding"
  
file_path: streamalert/matchers/default.py
label_desc: Use image node_id 1 for calling the AwsGuardDutyMatcher obj's underlying member method code with example usage: obj.guard_duty(cls, rec) and returns: unknown