Enable logging in spring boot actuator health check API

I am using Spring boot Actuator API for my project the having a health check endpoint, and enabled it by :

management.endpoints.web.base-path=/
management.endpoints.web.path-mapping.health=healthcheck

Mentioned here

Now I want to enable log in my application log file when ever the status of this above /healthcheck fails and print the entire response from this end point.

What is the correct way to achieve this?

Answer

Best way is to extend the actuator endpoint with @EndpointWebExtension. You can do the following;

@Component
@EndpointWebExtension(endpoint = HealthEndpoint.class)
public class HealthEndpointWebExtension {

    private HealthEndpoint healthEndpoint;
    private HealthStatusHttpMapper statusHttpMapper;

    // Constructor

    @ReadOperation
    public WebEndpointResponse<Health> health() {
        Health health = this.healthEndpoint.health();
        Integer status = this.statusHttpMapper.mapStatus(health.getStatus());
        // log here depending on health status.
        return new WebEndpointResponse<>(health, status);
    }
}

More about actuator endpoint extending here, at 4.8. Extending Existing Endpoints