Fluentd Blog

fluent-package v5.0.9 has been released

Hi users!

We have released fluent-package v5.0.9 on December 19, 2025. Fluent Package is a stable distribution package of Fluentd. (successor of td-agent v4)

This is a maintenance release of v5.0.x LTS series.

Fluent Package v5.0.9

• Updated bundled Fluentd to v1.16.11
  • Fluentd v1.16.11 has been released

This article explains the changes in Fluent Package v5.0.9.

Changes

Updated bundled Fluentd from v1.16.10 to v1.16.11

Fluentd v1.16.11 includes the following fixes:

• out_forward: fix issue where could cause output to stop when using <security> and TLS setting together under unstable network environments
  • In an unstable network environment, if communication is lost during the forward plugin's connection process after TLS is established, the out_forward connection process could fall into an infinite loop, causing log output to stop.
  • We applied the existing hard_timeout parameter setting to this connection process to enable interruption and recovery via timeout.

Download

Please see the download page.

Announcement

The final release of v5 LTS series

This release (v5.0.9) is planned to be the final version of the v5 LTS series. We strongly recommend upgrading to Fluent Package v6 LTS series for next long term support.

Please refer to Scheduled support lifecycle announcement about Fluent Package v6.

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