Hello there Freek,
we appreciate your contact.
We did consider the creation of such sensor, but didn't really find a way to make this user-friendly, flexible and easy to implement, so we eventually gave up the idea.
But this does still not prevent you from doing it. PRTG allows you to use anything you can code as a custom sensor. For instance, please have a look at this script:
This essentially does just that. It walks a specific OID (One column from the table) and then counts the number of entries in the column based on the returned value. You could essentially simplify this script and it will allow you to count the total number of entries in the table.
A bit of extra code might be needed to handle the empty table, as this may produce an exception from NET-SNMP. But apart from that, it should be very simple.
If you never created powershell-based custom scripts, it might be worth having a look here as well:
Best Regards,
Luciano Lingnau [Paessler Support]
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