[jboss-jira] [JBoss JIRA] (WFLY-12952) MP Health returns UP when checks are expected but not installed yet.

[Ivan Straka (Jira)]

Ivan Straka created WFLY-12952:
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             Summary: MP Health returns UP when checks are expected but not installed yet.
                 Key: WFLY-12952
                 URL: https://issues.redhat.com/browse/WFLY-12952
             Project: WildFly
          Issue Type: Bug
          Components: MP Health
    Affects Versions: 18.0.0.Final
            Reporter: Ivan Straka
            Assignee: Jeff Mesnil


MicroProfile Health specification [link|https://github.com/eclipse/microprofile-health/blob/master/spec/src/main/asciidoc/protocol-wireformat.adoc says:
* A producer MUST support custom, application level health check procedures
* A producer SHOULD support reasonable out-of-the-box procedures
* A producer with no health check procedures expected or installed MUST return positive overall status (i.e. HTTP 200)
* A producer with health check procedures expected but not yet installed MUST return negative overall status (i.e. HTTP 503)

When I deploy and application with a readiness probe before WildFly is started, from my and namely OpenShift POV the health check procedure is expected from the very beginning.
_Let me note that on OpenShift starting the served should mean starting the service._
Hence I expect negative overall status till the probe is ready and is able to provide response.

However WildFly with default setting responses with status UP:

{code:bash}
while true; do echo $(date +"%T.%3N") ;  curl   localhost:9990/health/ready; echo ""; done

17:17:56.438 curl: (7) Failed to connect to localhost port 9990: Connection refused
17:17:56.452 curl: (7) Failed to connect to localhost port 9990: Connection refused
17:17:56.466 {"status":"UP","checks":[]}
...
17:18:01.121 {"status":"UP","checks":[]}
17:18:01.133 {"status":"DOWN","checks":[{"name":"delayed-readiness","status":"DOWN"}]}
{code}
This violates (4) bullet in the specification. 

WildFly provides option to set global Status when probes are not defined ([documentation|https://doc-stage.usersys.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.3/html-single/configuration_guide/index#global_statuses_undefined_probes])

Which would mean the scenario would behave according to the specification. Yet the default state violates it.

If the default value were _DOWN_ we would run into an issue if WildFly without deployment were used (for example as backup for AMQ). The status would be just DOWN:
{noformat}
17:22:41.719
{"status":"DOWN","checks":[]}
{noformat}
And that would violate (3) in the specification.
TCK tests do not cover the scenario well.

Is there a way to return _DOWN_ until WildFly scan a deployment and if no health check is found (thus not expected) then start to return _UP_ ? The scan should happen during MP Health initialization. 
If there is no deployment, the _UP_ it is.




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