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Implementing Custom Actuator Endpoint

Spring Boot provides actuator endpoints that allows you to monitor or manage your application over JMX or HTTP. To add custom endpoint annotate Spring bean with @Endpoint.

package org.example.demo.actuate;

import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.stereotype.Component;

import java.lang.management.ManagementFactory;

@Component
@Endpoint(id = "uptime") // (1)
public class UptimeEndpoint {

    @ReadOperation // (2)
    public Uptime getUptime() {
        var runtime = ManagementFactory.getRuntimeMXBean();

        return new Uptime(runtime.getUptime(), runtime.getStartTime());
    }

    private record Uptime(long uptime, long startTime) { }

}
  1. @Endpoint marks the class as Actuator endpoint. For HTTP endpoints id specifies the path - actuator/uptime in this example.
  2. @ReadOperation marks the method as read operation. You can also use @WriteOperation and @DeleteOperation for respectively write and delete operations.

Accessing the endpoint:

$ curl 'http://localhost:8080/actuator/uptime' -i -X GET

would return the uptime in JSON format:

{"uptime":4285,"startTime":1701599039405}

For more information check the reference guide.

Troubleshooting​

The code does not compile​

Make sure that you have included the starter-actuator dependency:

build.gradle.kts
implementation("org.springframework.boot:spring-boot-starter-actuator")

/actuator/uptime returns 404 (Not Found)​

Due to security considerations, most endpoint by default are disabled over HTTP. You can enable all endpoints (after you read the docs) by setting management.endpoints.web.exposure.include:

application.properties
management.endpoints.web.exposure.include=*