We will come across certain Critical issues either during development phase or in a Production Environment. At that time of Troubleshooting we will look the INFO Logs in the PegaRules Log file. However some times it is not actually help in finding the Root-Cause.
Some good ways to quickly narrow down the issue is to set the DEBUG Log Level to certain Pega OOTB Classes.
This video shows how to enable the debug logs in Pega