Backport(v1.19): config: fix duplicate config file loading in config_include_dir (#5228) #5235
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**Which issue(s) this PR fixes**: Fixes # Ref. https://github.com/fluent/fluentd/discussions/5100 **What this PR does / why we need it**: Currently, if a user explicitly `@include`s a file that is also located in `config_include_dir`, the file is loaded twice. This causes startup failures due to port conflicts or ID duplication. This commit introduces a deduplication mechanism using a callback: 1. Add `on_file_parsed` callback to `Fluent::Config.build` to track files loaded during the user config parsing phase. 2. In `Supervisor`, record loaded files via this callback. 3. When expanding `config_include_dir`, skip files that have already been loaded in the user configuration. **Docs Changes**: **Release Note**: --------- Signed-off-by: Shizuo Fujita <fujita@clear-code.com> Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
kenhys
approved these changes
Jan 26, 2026
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Which issue(s) this PR fixes:
Backport #5228
Fixes #
Ref. #5100
What this PR does / why we need it:
Currently, if a user explicitly
@includes a file that is also locatedin
config_include_dir, the file is loaded twice.This causes startup failures due to port conflicts or ID duplication.
This commit introduces a deduplication mechanism using a callback:
on_file_parsedcallback toFluent::Config.buildto track files loaded during the user config parsing phase.Supervisor, record loaded files via this callback.config_include_dir, skip files that have already been loaded in the user configuration.Docs Changes:
Release Note: