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[kavierkoo (Kavier)]

codec => rubydebug will only print on screen.

If you want it to store in files, you will have to use file plugin

output {
 file {
   path => /tmp/my_output_text_file
   codec => rubydebug { metadata => true }
 }
}

Referring Link from:

Where can I find rubydebug output

Your description is a bit basic, so I'm not sure if this is your config. Assuming you have a valid input and filter config part, your output should look something like this: output { stdout { codec => rubydebug } } The above example will give you a ruby debug output on your console. If you would rather write it to file you can do it like this: output { file { path => /tmp/my_output_text_file codec => rubydebug } }