When TRACE logging level in keycloak is enabled, the standalone.xml (or domain.xml) should look like the following for the org.keycloak logger category under the logging subsystem:

<subsystem xmlns="urn:jboss:domain:logging:3.0">
    ....
    <logger category="org.keycloak">
        <level name="TRACE"/>
    </logger>
    ...
&lt...