Configuring the Spring Boot Actuator
The Actuator is a great tool. The documentation and history of changed configuration and implementation is however a big big mess.
To cut a LONG story short, with Spring Boot 2 and up, create an application.properties file with:
management.endpoints.web.exposure.include=*
and make sure the appliaction.properties file is in the classpath. When you run ./gradlew bootRun it is, but when you run java -jar build/libs/myapp-0.0.1-SNAPSHOT.jar it will NOT.