[config-server] Allow specification of down health status

[antechrestos]

Allow developer to set the property spring.cloud.config.server.health.down-health-status to a custom value. This may be usefull when you make the clone critical (init container for instance), yet want your pod not to be down if your remote is unavailable or cannot be reached; the service will be restricted yet should be seen as alive by the platform.

For instance we may use RESTRICTED status that is used by spring cloud admin to display it in yellow...

[antechrestos]

@spencergibb @ryanjbaxter this pull request is for discussion.

BTW @spencergibb , I may have spotted an issue in the documentation. Health Indicator section indicates that to disable the health check, you need to set management.health.config.enabled=false. However, in the code, another property is referenced - the one we find on your stackoverflow answer or in the official documentation. I can make another PR if needed.

[codecov]

Codecov Report

Merging #2056 (3030a2c) into main (863285d) will decrease coverage by 0.00%.
The diff coverage is 80.00%.

@@             Coverage Diff              @@
##               main    #2056      +/-   ##
============================================
- Coverage     77.11%   77.11%   -0.01%     
- Complexity     1440     1441       +1     
============================================
  Files           183      183              
  Lines          5362     5366       +4     
  Branches        699      699              
============================================
+ Hits           4135     4138       +3     
- Misses          956      957       +1     
  Partials        271      271              

Impacted Files	Coverage Δ
...fig/server/config/ConfigServerHealthIndicator.java	83.05% <80.00%> (-0.59%)	⬇️

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[ryanjbaxter]

Can you add a test that actually uses the property? I don't think it will actually work the way the code is now since there is no setter.

[ryanjbaxter]

I would set this to Status.DOWN.getCode()

[ryanjbaxter]

management.health.config.enabled=false should work base on this
https://docs.spring.io/spring-boot/docs/current/reference/html/actuator.html#actuator.endpoints.health.auto-configured-health-indicators

[antechrestos]

@ryanjbaxter thanks