Greetings Antonio,
we appreciate your contact.
I'm afraid that it's no trivial issue:
Based on the provided details and screenshots, the vendor's SNMP Implementation reports those values as Strings, if that's the case, PRTG can't graph it, PRTG will only graph numerical values.
Our SNMP Custom String Sensor will be able to extract the value using Regular Expressions when possible, in that case the Extracted Value Channel will be created and this value will then be graphed. (It can also be configured as primary channel).
You may review this KB Post "Value extraction using Regular Expression: Custom String Sensor" for more details about how to use this feature.
Best Regards,
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