By default, logs will be written to the same file: log/dk.log.
Optionally, you can use date format specifiers wrapped between curly braces in your FileWriter's stream option to automatically group your logs by day, week, month, year etc.
Examples:
log/dk-{Y}-{m}-{d}.log will create a new log file each day (eg: log/dk-2021-01-01.log)log/dk-{Y}-{W}.log will create a new log file each week (eg: log/dk-2021-10.log)The full list of format specifiers is available here.