docs: def FindChecks(cls,
                   artifact=None,
                   os_name=None,
                   cpe=None,
                   labels=None,
                   restrict_checks=None):
      """Takes targeting info, identifies relevant checks.
  
      FindChecks will return results when a host has the conditions necessary for
      a check to occur. Conditions with partial results are not returned. For
      example, FindChecks will not return checks that if a check targets
      os_name=["Linux"], labels=["foo"] and a host only has the os_name=["Linux"]
      attribute.
  
      Args:
        artifact: 0+ artifact names.
        os_name: 0+ OS names.
        cpe: 0+ CPE identifiers.
        labels: 0+ GRR labels.
        restrict_checks: A list of check ids to restrict check processing to.
  
      Returns:
        the check_ids that apply.
      """
      check_ids = set()
      conditions = list(cls.Conditions(artifact, os_name, cpe, labels))
      for chk_id, chk in iteritems(cls.checks):
        if restrict_checks and chk_id not in restrict_checks:
          continue
        for condition in conditions:
          if chk.triggers.Match(*condition):
            check_ids.add(chk_id)
            break  # No need to keep checking other conditions.
      return check_ids