Given the configuration of the logging system in Salesforce B2C Commerce where the log category is set to
"root" and a log level of INFO, and considering the code snippet provided, the beginning of the filename where the log will be written would be determined by the logger instance created with parameters "products" and "export". Here, "products" is the category and "export" is the subcategory. As per the standard logging configuration in B2C Commerce, the log file name typically starts with the category or subcategory name when defined, leading to the filename beginning with "custom-products". This prefix "custom-" indicates custom logging categories beyond the default system log files.