public static List<String> getPropertyNames(String subdomain) {
        final MUCServiceProperties props = propertyMaps.computeIfAbsent( subdomain, MUCServiceProperties::new );
        return new ArrayList<>(props.getPropertyNames());
    }
Returns all MUC service property names.

@param subdomain the subdomain of the service to retrieve a property from
@return a List of all property names (Strings).
xmppserver/src/main/java/org/jivesoftware/openfire/muc/spi/MUCPersistenceManager.java