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To configure logrotate to use files prefixed with timestamps by default, follow these steps:

1. Open the logrotate configuration file for the desired log file. This file is usually located at /etc/logrotate.conf or /etc/logrotate.d/.

2. In the configuration file, add the following line:

dateext

This line tells logrotate to use files with timestamps.

1. Optionally, you can also add the following lines to configure the date format for the timestamps:

dateformat %Y-%m-%d.%s

This line sets the format to year-month-day.seconds.

1. Save and close the configuration file.

From now on, logrotate will use file names with timestamps for the log files specified in the configuration file. For example, if the log file is called /var/log/nginx/access.log, the rotated files will be named /var/log/nginx/access.log.2021-01-01.123456, /var/log/nginx/access.log.2021-01-02.123456, etc.