I setup this sensor to monitor a custom OID that returns a number depending on error/warning. if the result is 1 set to warning, and if it's 2 set to error. Well if there's no error or warning the value is NULL or not set. How do I program this in the Custom String Sensor?
-> Error state: Must not include 2
-> Warning state Must not include 1
Both are set to plain text and both "Must include" fields are blank. I've tried entering what PRTG reports "NULL2" or just "NULL" along with Regex to match empty string "()", sensor still errors or shows down.