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Enhancements to Configuration section of the Logging guide #35988

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Sep 19, 2023
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Enhancements to Configuration section of the Logging guide #35988

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31 changes: 26 additions & 5 deletions docs/src/main/asciidoc/logging.adoc
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Expand Up @@ -241,13 +241,34 @@ All potential properties are listed in the <<loggingConfigurationReference,loggi

=== Logging categories

Logging is done on a per-category basis, with each category being configured independently.
A category configuration recursively applies to all subcategories of that category unless there is a more specific matching sub-category configuration.
Logging is configured on a per-category basis, with each category being configured independently.
Configuration for a category applies recursively to all subcategories unless there is a more specific subcategory configuration.

The parent of all logging categories is called the "root category".
This category, being the ultimate parent, may contain configuration which applies globally to all other categories. This includes the globally configured handlers and formatters.
The parent of all logging categories is called the "root category."
As the ultimate parent, this category might contain a configuration that applies globally to all other categories.
This includes the globally configured handlers and formatters.

.An example of a global configuration that applies to all categories:
====
[source, properties]
----
quarkus.log.handlers=console,mylog
----

In this example, the root category is configured to use two handlers: `console` and `mylog`.
====

.An example of a per-category configuration:
====
[source, properties]
----
quarkus.log.category."org.apache.kafka.clients".level=INFO
quarkus.log.category."org.apache.kafka.common.utils".level=INFO
----

This example shows how you can configure the minimal log level on the categories `org.apache.kafka.clients` and `org.apache.kafka.common.utils`.
====

Thus, configurations made under `quarkus.log.console.+*+`, `quarkus.log.file.+*+`, and `quarkus.log.syslog.+*+` are global and apply for all categories.
For more information, see <<loggingConfigurationReference>>.

If you want to configure something extra for a specific category, create a named handler like `quarkus.log.handler.[console|file|syslog].<your-handler-name>.*` and set it up for that category by using `quarkus.log.category.<my-category>.handlers`.
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