I am using file output plugin to write the logs processed by Logstash to files which are rotated day-wise but I want rotation of the output files based on the file size or after every say 4 hours. How can I achieve this?
You can use a ruby filter to create a field (as a subfield of @metadata if you don't want the field to be visible to the outputs) containing a value that you use in the path option of your file output. For example, to rotate logs every four hours you could take the current hour (in the range 0 to 23, obviously) and divide it with four to get an integer in the range 0 to 5.
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