This plugin periodically outputs memory allocation profiles by wrapping the leak_profiler gem. It is extremely useful for debugging slow memory leaks and analyzing Ruby heap fragmentation within Fluentd processes.

$ gem install fluent-plugin-leak-profiler

Add following line to your Gemfile:

gem "fluent-plugin-leak-profiler"

And then execute:

$ bundle

<source>
  @type leak_profiler
  output_dir /tmp
  interval 600
</source>

• Parameters
  • output_dir (string) (optional): Directory to output the profile logs. Default is /tmp.
  • interval (time) (optional): Interval to profile and output the memory state. Default is 600 (10 minutes).

The plugin will generate a log file named leak_profiler-<pid>.log in the specified output_dir. You can tail this file to monitor memory allocations:

$ tail -f /tmp/leak_profiler-12345.log

• Copyright(c) 2026- Watson
• License
  • Apache License, Version 2.0