Doc for 3.x describes the use of helidon.health.exclude to exclude built-in checks but that's not the correct config key

[tjquinno]

Environment Details

• Helidon Version: 3.x
• Helidon SE or Helidon MP
• JDK version:
• OS:
• Docker version (if applicable):

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Problem Description

The doc https://helidon.io/docs/v3/mp/health#_configuration_options describes the ability to set helidon.health.exclude to a comma-separated list of built-in health check names. In fact, Helidon looks at health.exclude (no helidon prefix).

(Similar problem most likely with include, include-classes, and exclude-classes.)

The Javadoc for the built-in health checks repeats the same error.

(See #9322 for the remaining problem.)
Further confusing matters, some built-in health checks support configuration to fine-tune their behavior and those settings do use the longer helidon.health prefix (e.g., helidon.health.diskSpace.thresholdPercent).

We might want/need to support both prefix styles for both types of settings (the per-health-check configuration and the exclude and include configuration), deprecating the keys with the helidon prefix and perhaps even logging a warning if the helidon prefix appears for health settings.

Steps to reproduce

Use the Helidon 3 MP QuickStart example app.

1. Build and run the application without change.

2. Run curl -v http://localhost:8080/health. The output includes the deadlock health check.

3. In the Helidon 3 MP quickstart app, add the following to META-INF/microprofile-config.properties:

   health.exclude=deadlock
   

4. Rebuild and rerun the app.

5. Run curl -v http://localhost:8080/health again. The output does not contain the deadlock health check information.

6. Change the added config line to

   helidon.health.exclude=deadlock
   

7. Rebuild and rerun the app.

8. Access curl -v http://llocalhost:8080/health again. The output again contains the deadlock health check.