Note that envvar cannot be used in include section (#2289)

* note that envvar cannot be used in include section

Signed-off-by: Jimin Ha <[email protected]>

* add note to classic format

Signed-off-by: Jimin Ha <[email protected]>

---------

Signed-off-by: Jimin Ha <[email protected]>

Author: jimin9038

administration/configuring-fluent-bit/classic-mode/configuration-file.md

@@ -159,3 +159,5 @@ Wildcard character (`*`) supports including multiple files. For example:
 ```
 
 Files matching the wildcard character are included unsorted. If plugin ordering between files needs to be preserved, the files should be included explicitly.
+
+Environment variables aren't supported in includes section. The file path must be specified as a literal string.

administration/configuring-fluent-bit/yaml/includes-section.md

@@ -26,3 +26,5 @@ includes:
 Ensure that the included files are formatted correctly and contain valid YAML configurations for seamless integration.
 
 If a path isn't specified as absolute, it will be treated as relative to the file that includes it.
+
+Environment variables aren't supported in includes section. The file path must be specified as a literal string.