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Document how to use structured logging with custom log configuration #43301

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28 changes: 28 additions & 0 deletions .../spring-boot-docs/src/docs/antora/modules/reference/pages/features/logging.adoc
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Expand Up @@ -450,6 +450,34 @@ Spring Boot supports structured logging and has support for the following JSON f

To enable structured logging, set the property configprop:logging.structured.format.console[] (for console output) or configprop:logging.structured.format.file[] (for file output) to the id of the format you want to use.

If you are using xref:#features.logging.custom-log-configuration[Custom Log Configuration], update your configuration to respect `CONSOLE_LOG_STRUCTURED_FORMAT` and `FILE_LOG_STRUCTURED_FORMAT` system properties.
Take `CONSOLE_LOG_STRUCTURED_FORMAT` for example:
[tabs]
======
Logback::
+
[source,xml]
----
<!-- replace your encoder with StructuredLogEncoder -->
<encoder class="org.springframework.boot.logging.logback.StructuredLogEncoder">
<format>${CONSOLE_LOG_STRUCTURED_FORMAT}</format>
<charset>${CONSOLE_LOG_CHARSET}</charset>
</encoder>
----
Log4j2::
+
[source,xml]
----
<!-- replace your PatternLayout with StructuredLogLayout -->
<StructuredLogLayout format="${sys:CONSOLE_LOG_STRUCTURED_FORMAT}" charset="${sys:CONSOLE_LOG_CHARSET}"/>
----
======
You can refer to default configurations in `spring-boot.jar` for fine-grained control:

* {code-spring-boot}/spring-boot-project/spring-boot/src/main/resources/org/springframework/boot/logging/logback/structured-console-appender.xml[Logback Structured Console Appender]
* {code-spring-boot}/spring-boot-project/spring-boot/src/main/resources/org/springframework/boot/logging/logback/structured-file-appender.xml[Logback Structured File Appender]
* {code-spring-boot}/spring-boot-project/spring-boot/src/main/resources/org/springframework/boot/logging/log4j2/log4j2.xml[Log4j2 Console Appender]
* {code-spring-boot}/spring-boot-project/spring-boot/src/main/resources/org/springframework/boot/logging/log4j2/log4j2-file.xml[Log4j2 Console and File Appender]


[[features.logging.structured.ecs]]
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