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The status returned is one of below:

• UP →  The -  The component or subsystem is working as expected.
• DOWN → The - The component is not working.
• OUT_OF_SERVICE → The - The component is out of service temporarily.
• UNKNOWN →  The - The component state is unknown.

The following separate components are configured for health status check

• /manage/health/db - provides information on database type and connectivity state
• /manage/health/diskSpace - provides information on current disk space usage and threshold configured
• /manage/health/ping - ability to be pinged (always UP)

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The following endpoints are exposed to provide readiness and liveness probes for containerized application management
systems platforms like kubernetes

• /manage/health/readiness - indicates the application completed the initialization state stage and ready to accept the requests
• /manage/health/liveness - indicates the application is up and running, no need to restart the container

$ curl http://localhost:8080/manage/health/readiness -i -X GET
$ curl http://localhost:8080/manage/health/liveness -i -X GET

Logging: /manage/loggers

The endpoint allows to retrieve information about and update the log level setting on per logger identifier basis.

The following endpoints are exposed

• /manage/loggers - provides information about all the loggers configured
• /manage/loggers/{logger-id} GET - retrieves log level settings for requested logger identifier
• /manage/loggers/{logger-id} POST - updates or resets the log level settings for requested logger identifier

Getting log level information :

$ curl http://localhost:8080/manage/loggers -i -X GET
$ curl http://localhost:8080/manage/loggers/org.onap.cps -i -X GET

Loggers

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Updating log level:

$ curl http://localhost:8080/manage/loggers/org.onap.cps -i -X POST -H 'Content-Type: application/json' -d '{"configuredLevel": "DEBUG"}'

Resetting log level:

$ curl http://localhost:8080/manage/loggers/org.onap.cps -i -X POST -H 'Content-Type: application/json' -d '{}'

Resources

Documentation:

• https://docs.spring.io/spring-boot/docs/current/reference/html/production-ready-features.html 

Tutorials:

• https://spring.io/guides/gs/actuator-service/
• https://www.baeldung.com/spring-boot-actuators
• https://www.baeldung.com/spring-boot-changing-log-level-at-runtime