Adding metrics from custom RealmResourceProvider

I’m trying to add some metrics to my custom RealmResourceProvider and would like the metrics to show up in the /metrics endpoint.

I have tried this in my RealmResourceProvider

@Timed(name = "work-time",
       description = "Metrics to monitor time to do work",
       unit = MetricUnits.MINUTES,
       absolute = true)
@GET
@Path("/dowork")
public String doWork() {
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    return "work done!";
}

But the metric does not show up in the /metrics result.

Im running on Keycloak 13.0.0 using the docker image and have enabled metrics using the KEYCLOAK_STATISTICS environment variable.

Have i completely misunderstod how to add metrics in a Wildfly application or is there some special Keycloak trickery that needs to be done?