[wildfly-dev] Should I fail or should I undefine ?

Hello, I was looking into introducing new metrics and got into a discussion with Jeff about what is the proper way to handle the fact that the service is missing. Currently if the JMSBridge is not available as a service then reading any read only runtime attribute fails with a: {     "outcome" => "failed",     "result" => 0,     "failure-description" => "WFLYCTL0216: Management resource '[     (\"subsystem\" => \"messaging-activemq\"),     (\"jms-bridge\" => \"test\") ]' not found",     "rolled-back" => true } So "/subsystem=messaging-activemq/jms-bridge=test:read-attribute(name=started)" will fail in admin-only mode. This feels strange to me as i would expect an "undefined" result and not a failure. In the same way, trying to get the number of processed messages by the bridge should return undefined since the bridge is not running. Do we have a rule so that this behaviour is consistent ? Cheers, Emmanuel