I do :write-attribute(name=security-enabled, value=true) ++ reload of the server
Note: I didn't add user via bin/add-user.sh

Kabir edit: the full command is:
/subsystem=microprofile-health-smallrye:write-attribute(name=security-enabled,value=true)

When I'm trying to access http://127.0.0.1:9990/health I receive page which is there primarily for web console:

<h3>Your WildFly Application Server is running.</h3>

<p>However you have <strong>not</strong> yet <strong>added any users</strong> to be able
 to access the admin console.</p>

<p>To add a new user execute the <code>add-user.sh</code> script within the bin folder of
 your WildFly installation and enter the requested information.</p>

Can /health endpoint get customized response in case no mgmt user is defined on server side ?
Current response can be little confusing if user is not yet so familiar with WildFly.

I marked this as minor bug. ... see comments