As part of WFLY-18582, users will be able to configure a context name from which the Micrometer subsystem servers Prometheus metrics. This context will live on the management interface alongside the WF Metrics context, which uses "/metrics". If the admin configures Micrometer to use "/metrics" but does not disable the WF Metrics subsystem, an ISE will be thrown in Stage.RUNTIME. This conflict should be caught much sooner (Stage.MODEL) so you can't configure incorrectly in admin-only and then have it blow up when you reload/start in normal mode. See Brian's comment here for a possible solution.