Estimate log volume from Application

HI Lgab_siem , there's online tools out there that will give you an estimation depending on the log sources. For example: https://siemsizingcalculator.logpoint.com/

If you want to monitor a custom built application, I would suggest to redirect the logs to disk and see the size of them over a 24 hour period...that should give you a good idea.

Regards