docs: def set_default_cwc(self, section,
                          option_header=None,
                          cwc=['50', '70', '90']):
          """Set default values for careful, warning and critical."""
          if option_header is None:
              header = ''
          else:
              header = option_header + '_'
          self.set_default(section, header + 'careful', cwc[0])
          self.set_default(section, header + 'warning', cwc[1])
          self.set_default(section, header + 'critical', cwc[2])