...
If you want to check the debug log, you will find it here:
For Linux serverActiveGate:
/var/lib/dynatrace/remotepluginmodule/log/extensions/datasources/custom_alanata.python.nagios/python3.log
For Windows serverActiveGate:
C:\ProgramData\dynatrace\remotepluginmodule\log\extensions\datasources\custom_alanata.python.nagios\python.exe.log
...