Should suggest to use jkube.domain if createExternalUrls is used without domain.

[sunix]

Description

I have recently been using jkube.createExternalUrls but forgot to set the domain. Would be nice to log a HINT message with the suggestion.

[rohanKanojia]

I've created PR #1980 to add this hint : No host configured for Ingress. You might want to use jkube.domain to add desired host suffix

However, I have a feeling that this hint might not be clearly visible. It might get lost in logs.

jkube-quarkus-ingress : $ mvn k8s:resource
[INFO] Scanning for projects...
[INFO] 
[INFO] ----------------< org.eclipse.jkube:test-jkube-ingress >----------------
[INFO] Building test-jkube-ingress 1.0.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- kubernetes-maven-plugin:1.11-SNAPSHOT:resource (default-cli) @ test-jkube-ingress ---
[INFO] k8s: Running generator quarkus
[INFO] k8s: quarkus: Using Docker image quay.io/jkube/jkube-java:0.0.17 as base / builder
[INFO] k8s: Using resource templates from /home/rokumar/work/repos/jkube-testing/jkube-quarkus-ingress/src/main/jkube
[INFO] k8s: jkube-service: Adding a default service 'test-jkube-ingress' with ports [8080]
[INFO] k8s: HINT: No host configured for Ingress. You might want to use `jkube.domain` to add desired host suffix
[INFO] k8s: jkube-healthcheck-quarkus: Adding readiness probe on port 8080, path='/q/health/ready', scheme='HTTP', with initial delay 5 seconds
[INFO] k8s: jkube-healthcheck-quarkus: Adding liveness probe on port 8080, path='/q/health/liveness', scheme='HTTP', with initial delay 10 seconds
[INFO] k8s: jkube-service-discovery: Using first mentioned service port '80' 
[INFO] k8s: jkube-service-discovery: Using first mentioned service port '8080' 
[INFO] k8s: jkube-revision-history: Adding revision history limit to 2
[INFO] k8s: validating /home/rokumar/work/repos/jkube-testing/jkube-quarkus-ingress/target/classes/META-INF/jkube/kubernetes/test-jkube-ingress-service.yml resource
[WARNING] Unknown keyword $module - you should define your own Meta Schema. If the keyword is irrelevant for validation, just use a NonValidationKeyword
[WARNING] Unknown keyword existingJavaType - you should define your own Meta Schema. If the keyword is irrelevant for validation, just use a NonValidationKeyword
[WARNING] Unknown keyword javaOmitEmpty - you should define your own Meta Schema. If the keyword is irrelevant for validation, just use a NonValidationKeyword
[INFO] k8s: validating /home/rokumar/work/repos/jkube-testing/jkube-quarkus-ingress/target/classes/META-INF/jkube/kubernetes/test-jkube-ingress-deployment.yml resource
[INFO] k8s: validating /home/rokumar/work/repos/jkube-testing/jkube-quarkus-ingress/target/classes/META-INF/jkube/kubernetes/test-jkube-ingress-ingress.yml resource
[INFO] k8s: validating /home/rokumar/work/repos/jkube-testing/jkube-quarkus-ingress/target/classes/META-INF/jkube/kubernetes/jkube-docker-registry-service.yml resource
[INFO] k8s: validating /home/rokumar/work/repos/jkube-testing/jkube-quarkus-ingress/target/classes/META-INF/jkube/kubernetes/jkube-docker-registry-storage-persistentvolumeclaim.yml resource
[INFO] k8s: validating /home/rokumar/work/repos/jkube-testing/jkube-quarkus-ingress/target/classes/META-INF/jkube/kubernetes/jkube-docker-registry-deployment.yml resource
[INFO] k8s: validating /home/rokumar/work/repos/jkube-testing/jkube-quarkus-ingress/target/classes/META-INF/jkube/kubernetes/jkube-docker-registry-ingress.yml resource
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  4.237 s
[INFO] Finished at: 2022-12-27T21:13:24+05:30
[INFO] ------------------------------------------------------------------------

Maybe I'm thinking a bit too far but shall we make changes so that these HINT messages show up after goal/task execution? We might need to do something similar like Summary (maybe implement HintService).

[manusa]

I'm not sure I'd call this "Hint service" but this should definitely go in the summary.
Also, this message might qualify for a warning (Is the generated Ingress without host valid? is it usable?)