Fluentd Blog

Fluentd v1.16.8 has been released

Hi users!

We have released v1.16.8 on 2025-05-01. ChangeLog is here.

This release is a maintenance release of v1.16 series.

This release will be bundled for upcoming fluent-package LTS version v5.0.7!

Bug Fixes

Windows: Stop the service correctly when the supervisor is dead

In this release, we have fixed a bug that Windows service process will continue running even if the supervisor process is dead due to config error or etc.

With fluentd#4942 fixed, it becomes easier to notice config errors and other issues.

formatter_csv: Fixed memory leak

The caching mechanism introduced for performance optimization was caching threads inappropriately in formatter_csv. The in_exec plugin creates a thread each time to emit an event. Then all threads were cached in formatter_csv, causing a memory leak.

With fluentd#4920 fixed, it becomes stable.

Misc news

Windows: Add fiddle as dependency gem for Ruby 3.5

For comming Ruby 3.5, we have added a fiddle gem as dependency.

CI stabilization

We are enforcing stabilizing CI of Fluentd. It has nothing to do with Fluentd's functionality directly, but it is very important to provide stable version of Fluentd continuously.

Enjoy logging!