blog: add fluent-package v5.0.5 release announcement (#332)

Signed-off-by: Kentaro Hayashi <[email protected]>

content/blog/20241108_fluent-package-v5.0.5-has-been-released.md

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+# fluent-package v5.0.5 has been released
+
+Hi users!
+
+We have released fluent-package [v5.0.5](https://github.com/fluent/fluent-package-builder/releases/tag/v5.0.5).
+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.
+As bundled Ruby was updated to 3.2.6 and Fluentd was updated to 1.16.6.
+We recommend upgrading to fluent-package v5.0.5!
+
+### Changes from fluent-package v5.0.4
+
+In this release, focused on updating bundled ones.
+
+* Update ruby to 3.2.6
+* Update fluentd to 1.16.6
+* Update bundled gems overall
+* Solved possibility of DoS through "NoMemoryError"
+* msi: set `GEM_HOME`/`GEM_PATH` in fluentd.bat
+* Fixed SIGABORT error with fluent-plugin-systemd
+
+### Solved possibility of DoS through "NoMemoryError"
+
+In the previous versions of msgpack gem, there was a possibility that cause DoS (Denial Of Service)
+when crafted message was sent to Fluentd.
+
+When that message was sent, it might cause "NoMemoryError" on Fluentd because there is a case that msgpack
+try to pre-allocate huge amount of memories.
+
+Above behavior was fixed not to pre-allocate over 32k entries (limit pre-allocated amount of memories) in msgpack 1.7.3 and bundled into fluent-package v5.0.5.
+
+### msi: set `GEM_HOME`/`GEM_PATH` in fluentd.bat
+
+In the previous versions, fluentd.bat doesn't set GEM_HOME/GEM_PATH explicitly.
+
+If users set custom `GEM_HOME` / `GEM_PATH` environment variables, the
+batch file will not work as expected. Therefore, this patch will set
+the appropriate values in the batch file.
+
+Above bug was also fixed in fluent-package v5.0.5.
+
+### Fixed SIGABORT error with fluent-plugin-systemd
+
+In this release, the bundled fluent-plugin-systemd was updated to 1.1.0.
+That release fixed SIGABORT error with inconsistency of memory allocator handling.
+
+### Download
+
+Please see [the download page](/download/fluent_package).
+
+#### About next LTS schedule
+
+We plan to ship the next LTS version of fluent-package v5.0.6 on March, 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](schedule-for-td-agent-4-eol), td-agent v4 was 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](upgrade-td-agent-v4-to-v5)
+
+TAG: Fluentd fluent-package Announcement
+AUTHOR: clearcode