(1) pom.xml changes show WF BOM instead of EAP one:

        <groupId>org.wildfly.bom</groupId>
        <artifactId>wildfly-microprofile</artifactId>
        <version>${version.server.bom}</version>
where ${version.server.bom} is the version of your JBoss EAP XP, in our case "1.0".

Please notice there's no WF BOM of version 1.0.

(2) WildFly used several times instead of JBoss EAP XP or simply server, e.g.:

<!-- Import the MicroProfile Metrics API, we use provided scope as the API is included in WildFly -->

This is also used in pom.xml.
Some sentences use correct product name, e.g.:

Even without any direct interaction, JBoss EAP XP server already collects and exposes some metrics.

(3) I'm not sure if this sentence is correct: You can note that there are custom metrics exposed by the individual JBoss EAP XP subsystems which are prefixed by wildfly_ or jboss_. - when accessing the endpoint as documented with EAP XP, I only see jboss_ prefix, no wildfly_ ones. Please confirm this is correct.

(4) I think there's mistake in You can test it be typing for instance application_org_quickstart_microprofile_metrics_PrimeNumberChecker_performedChecks_total as the query expression and executing this query. There's no such item. Should it be application_org_wildfly_quickstarts_microprofile_metrics_PrimeNumberChecker_performedChecks_total?