ppkarwasz commented on issue #3104:
URL:
https://github.com/apache/logging-log4j2/issues/3104#issuecomment-2419429528
The YAML configuration format interprets **arrays** as a list of element
having the same plugin type as the **key** of the array.
Translated to XML your example looks like:
```xml
<AppenderRef ref="CONSOLE">
<Filters>
<MarkerFilter marker="COMMAND" onMatch="DENY" onMismatch="NEUTRAL"/>
<Filters>
<!-- This element is ignored since there can be only one filter element.
An `ERROR` is logged to the status logger -->
<Filters>
<MarkerFilter marker="METRICS" onMatch="DENY" onMismatch="NEUTRAL"/>
<Filters>
</AppenderRef>
```
What you want is for your `Filters` YAML object to contain an array with key
`MarkerFilter`:
```yaml
AppenderRef:
ref: CONSOLE
Filters:
MarkerFilter:
- marker: COMMAND
onMatch: DENY
onMismatch: NEUTRAL
- marker: METRICS
onMatch: DENY
onMismatch: NEUTRAL
```
See [Configuration
syntax](https://logging.apache.org/log4j/2.x/manual/configuration.html#configuration-syntax).
There is a tip about YAML arrays.
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