As seen in infinispan-config-14.0.xsd from the Infinispan Core JAR:

<xs:attribute name="names-as-tags" type="xs:boolean" default="${GlobalMetrics.namesAsTags}">
  <xs:annotation>
    <xs:documentation>
    Put the cache manager and cache name in tags rather than include them in the metric name.
    </xs:documentation>
  </xs:annotation>
</xs:attribute>

See "${GlobalMetrics.namesAsTags}".

My understanding is that all the GlobalMetrics occurrences defined in https://github.com/infinispan/infinispan/blob/14.0.x/core/src/main/resources/schema/infinispan-config-14.0.xsd are supposed to be replaced by their default value thanks to infinispan-defaults-maven-plugin, right?
But apparently there's something not working for namesAsTags, as it still appears as a placeholder in the XSD which end up in the released JAR file.