Fluentd Blog

fluent-package v5.0.7 has been released

Hi users!

We have released fluent-package v5.0.7. 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. Bundled Fluentd was updated to 1.16.9.

We recommend upgrading to fluent-package v5.0.7!

Changes from fluent-package v5.0.6

• Update bundled ruby to 3.2.8
• Update bundled Fluentd to v1.16.9
  • Fluentd v1.16.8 has been released
  • Fluentd v1.16.9 has been released
• Update bundled gems overall
• Update bundled openssl gem to 3.3.0 due to support FIPS
• Fix memory leaks when exception was raised frequently with fluent-plugin-elasticsearch

Update bundled openssl gem to 3.3.0 due to support FIPS

With an old gem, it caused an exception after FIPS enabled in OpenSSL. We have updated the bundled openssl gem to 3.3.0 to solve the issue.

Fix memory leaks when exception was raised frequently with fluent-plugin-elasticsearch

There were memory leaks under conditions where exceptions frequently occurred during communication between Elasticsearch and fluent-plugin-elasticsearch. The issue was fixed in fluent-plugin-elasticsearch v5.4.4 and bundled into fluent-package v5.0.7.

Download

Please see the download page.

Announcement

About next LTS schedule

We plan to ship the next LTS version of fluent-package v5.0.8 on September, 2025. The content of updates are still in T.B.D.

End of support for td-agent v4, let's migrate to fluent-package

As it was already announced Drop schedule announcement about EOL of Treasure Agent (td-agent) 4, td-agent v4 reached EOL in Dec, 2023.

After reached EOL, td-agent v4.5.3 on Windows was released because there was a crash bug during startup on Windows. It was backported fix from fluent-package v5 as it is critical in some case. Even though this was a exceptional maintenance release, but there is no change to the fact that we already stopped maintaining td-agent v4.

We strongly recommend migrating from td-agent v4 to fluent-package v5 (LTS). See Upgrade to fluent-package v5

Follow us on X

We have been posting information about Fluentd in Japanese on @fluentd_jp. We would appreciate it if you followed the X account.

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Fluentd v1.16.9 has been released

Hi users!

We have released v1.16.9 on 2025-05-14. ChangeLog is here.

This release is a maintenance release of v1.16 series. In this release, we have fixed a critical bug of the previous version, v1.16.8. Please do not use v1.16.8.

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

Bug Fixes

Windows: Fix bug where the service accidentally stops after starting

In the previous version v1.16.8, the Windows service (fluentdwinsvc) accidentally stops after starting without stopping the supervisor and worker processes. This is a critical bug of v1.16.8 for users who use Fluentd as a Windows service.

In this release, we have fixed this bug.

See #4954 for more information.

Enjoy logging!

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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!

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Drop Alpine and switch default to Debian for Fluentd docker image

Hi users!

We have planned to change what docker image provides.

Currently, we ship Fluentd docker image for Alpine and Debian (armhf, arm64, amd64). But, Alpine image in Fluentd was already marked as deprecated, so we will make things forward.

In the near future, we will drop Alpine image. This decision affects existing Alpine image users.

Notice about existing Alpine image users

• fluent/fluentd:edge will be changed from Alpine to Debian image
  • This is a notable incompatible change!
• v1.19 (not released yet)
  • No more releases for Alpine images
  • Then short tag also changed to Debian images (e.g. v1.19.0-1.0, v1.19-1 should be Debian instead of Alpine)
• v1.18 Alpine image will not be supported after v1.19 is released (T.B.D.), so recommend to migrate it!
• v1.16 Alpine image will be supported until Dec 2025, so there is room to migrate gradually.

If you still want to use Alpine, keep v1.16 series or v1.18 series. (not recommended though)

Why not provide Alpine anymore?

It was well known that Alpine has possibility of incompatibility and performance issues in contrast to Debian images. It was a historical reason to provide Alpine images - "In the previous versions, we provided them", so there is no positive reason to continue it.

Provide shorter tags to follow internal version bump

Not only just dropping Alpine image, we will improve tagging rules:

• Add version-specific tag which will not be affected by internal version bump

In previous versions, there was no version-specific tag which would follow internal version bump. For example, if you want to stick to Fluentd v1.18.0, you can select v1.18.0-1.0, but if internal version was bumped to v1.18.0-1.1 or something, need to update it. There is edge-debian tag, but it does not stick to a specific Fluentd version because it will automatically update when the next major/minor version is released.

For such a purpose, shorter v1.19 or v1.19.x tag will be available in the future release.

Happy logging!

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fluent-package v5.0.6 has been released

Hi users!

We have released fluent-package v5.0.6. 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. Bundled Fluentd was updated to 1.16.7.

We recommend upgrading to fluent-package v5.0.6!

Changes from fluent-package v5.0.5

In this release, known Windows issues were fixed.

• Update bundled Fluentd to v1.16.7
• Update bundled gems overall
• msi: Fixed to keep some registry values with update

msi: Fixed to keep some registry values with update

In the previous versions, there had been a known issue that fluent-package could not keep some registry values when upgrading.

Thus, if you modify Fluentd service (fluentdwinsvc) related registry, you need to restore your configuration after upgrading.

Since v5.0.6, fluent-package was fixed to keep some registry values during upgrading package.

Here is the target registry which will be kept during upgrading fluent-package:

• Start
• DelayedAutostart
• fluentdopt (logging path might be modified by users)

In most cases, fluent-package user might want to keep fluentdopt because it stores additional command line option parameters.

In this release, bundled Fluentd v1.16.7 also contains the fixes for Windows.

• Windows: Fix NoMethodError of --daemon option
• Windows: Fixed the issues which are related to start/stop Fluentd service

See Fluentd v1.16.7 has been released blog article in details.

Download

Please see the download page.

Announcement

About next LTS schedule

We plan to ship the next LTS version of fluent-package v5.0.7 on June, 2025. The content of updates are still in T.B.D.

End of support for td-agent v4, let's migrate to fluent-package

As it was already announced Drop schedule announcement about EOL of Treasure Agent (td-agent) 4, td-agent v4 reached EOL in Dec, 2023.

After reached EOL, td-agent v4.5.3 on Windows was released because there was a crash bug during startup on Windows. It was backported fix from fluent-package v5 as it is critical in some case. Even though this was a exceptional maintenance release, but there is no change to the fact that we already stopped maintaining td-agent v4.

We strongly recommend migrating from td-agent v4 to fluent-package v5 (LTS). See Upgrade to fluent-package v5

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