blog: add EOL announcement about td-agent v4

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

content/blog/20230829_schedule-for-td-agent-4-eol.md

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+# Drop schedule announcement about EOL of Treasure Agent (td-agent) 4
+
+Hi users and developers!
+
+We announce the dropping schedule for TD Agent 4 development.
+
+## About Treasure Agent (td-agent) 4
+
+Since td-agent 4.0.0 was released in 2020, td-agent 4 had been maintained for a long time.
+
+As new major version of td-agent 4 was reblanded (to `fluent-package` v5), and released in August 2023,
+we decided to stop maintaining td-agent 4.
+
+## Scheduled end of life - Dec 2023
+
+As you know, already stepping down maintenance activity, new minor update for td-agent 4 will not be shipped anymore.
+(td-agent v4.5.1 will be the last release of this series, it will be shipped in this month.)
+
+Thus, we recommend to use fluent-package v5, latest fluentd v1.16 series, for new deployment :)
+
+## How to migrate to Fluent Package v5
+
+There is a good article to do it.
+
+* [Upgrade to fluent-package v5](upgrade-td-agent-v4-to-v5)
+
+Follow the above instructions.
+
+TAG: Fluentd td-agent Announcement
+AUTHOR: clearcode
+
+
+