Tie Spring Liveness probe to custom HealthCheck

Question

Having a SpringBoot application, where I try to tie my custom HealthCheck to the Spring Liveness probe. Although, it seems not to work. Please see my code below:

@Component
class CustomHealthIndicator() : HealthIndicator {


    override fun health(): Health {
        Thread.sleep(20000)
        return Health.down().build()
    }
}

In my application.properties, I've added my CustomHealthIndicator to the liveness group like this:

management.endpoint.health.group.liveness.include=livenessState,custom

Through this, I expect, that the livenessState of my SpringBoot application will report it's status as down. Although, it does not seem to work, the status is report as up.

What am I missing here? I did follow the blog entry here: https://spring.io/blog/2020/03/25/liveness-and-readiness-probes-with-spring-boot and it should work like this, according to the author...

Thanks for any input!