SpringBoot 自定义 health Actuator 原理
org.springframework.boot.actuate.health.HealthEndpoint#health
org.springframework.boot.actuate.health.HealthIndicator#health
org.springframework.boot.actuate.health.CompositeHealthIndicator#health
org.springframework.boot.actuate.health.HealthEndpoint#health
org.springframework.boot.actuate.health.HealthIndicator#health
org.springframework.boot.actuate.health.CompositeHealthIndicator#health