SpringBoot Management health group does not inherit show-details property

Hello,

I am using health group feature and I noticed that I have to specify show-details for each group. In my understanding (doc : https://docs.spring.io/spring-boot/docs/2.3.1.RELEASE/reference/htmlsingle/#production-ready-health-groups) it should use the management.endpoint.health.show-details as default value, but it is not.

management:
  endpoint:
    health:
      show-details: always
      group:
        ping-only:
          #show-details: always
          include: ping
        comp1-only:
          #show-details: always
          include: comp1
        comp2-only:
          #show-details: always
          include: comp2
        without-components:
          #show-details: always
          include: '*'
          exclude: 'comp1,comp2'

with previous configuration I get :

http://localhost:8080/actuator/health/without-components

{"status":"UP"}

If I uncomment lines I get :

http://localhost:8080/actuator/health/without-components

{"status":"UP","components":{"diskSpace":{"status":"UP","details":{"total":250685575168,"free":54778855424,"threshold":10485760,"exists":true}},"ping":{"status":"UP"}}}

Note: I am using 2.3.1.RELEASE version

Comment From: philwebb

Thanks for the bug report. I think the problem is that we set a default value in HealthProperties.showDetails and for groups it should be null.

Comment From: polarbear567

Hi, @philwebb I can take this issue.

Comment From: bclozel

Closing in favor of #22022