Hello Paul,
we appreciate your contact.
There are a few options within PRTG, especially when talking about our Custom Sensors:
For instance, you can use our HTTP Push Data Advanced Sensor to Push data via HTTP into a specific sensor at the time of the error. Please check the sensor's how-to for further setup details.
You can also use an EXE/Script Advanced Sensor to regularly query a file or your application directly to read the amount of "errors".
If your application stores data on a SQL Server you can use any of our SQL Sensors to monitor the number of errors stored in a table or any query result:
It's also possible to use the native Syslog Receiver Sensor or SNMP Trap Receiver Sensor if your application is able to send Syslog or SNMP traps of any sort. Please note that this option may provide less flexibility than the previously mentioned Custom Sensors.
You can find further details about PRTG's API within PRTG under Setup > PRTG API, please check the Custom Sensors tab.
Best Regards,
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