code: def check_threshold(value, warning=None, critical=None):
          
          if critical is not None:
              if not isinstance(critical, Threshold):
                  critical = Threshold(critical)
              if not critical.check(value):
                  return CRITICAL
          if warning is not None:
              if not isinstance(warning, Threshold):
                  warning = Threshold(warning)
              if not warning.check(value):
                  return WARNING
          return OK
docs: checks a value against warning and critical thresholds
          threshold syntax: https://nagios-plugins.org/doc/guidelines.html
  
          arguments:
              value: the value to check
              warning: warning threshold
              critical: critical threshold
  
          returns:
              the result status of the check