Custom Health Indicators in Spring Boot

spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/HealthApplication.java

@@ -0,0 +1,12 @@
+package com.baeldung.health;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class HealthApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HealthApplication.class, args);
+    }
+}

spring-boot-modules/spring-boot-actuator/src/main/java/com/baeldung/health/RandomHealthIndicator.java

@@ -0,0 +1,28 @@
+package com.baeldung.health;
+
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.HealthIndicator;
+import org.springframework.stereotype.Component;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ThreadLocalRandom;
+
+@Component
+public class RandomHealthIndicator implements HealthIndicator {
+
+    @Override
+    public Health health() {
+        double chance = ThreadLocalRandom.current().nextDouble();
+        Health.Builder status = Health.up();
+        if (chance > 0.9) {
+            status = Health.down(new RuntimeException("Bad Luck"));
+        }
+
+        Map<String, Object> details = new HashMap<>();
+        details.put("chance", chance);
+        details.put("strategy", "thread-local");
+
+        return status.withDetails(details).build();
+    }
+}

spring-boot-modules/spring-boot-actuator/src/main/resources/application.properties

@@ -1 +1,5 @@
-management.health.probes.enabled=true
+management.health.probes.enabled=true
+management.endpoint.health.show-details=always
+management.health.random.enabled=false
+management.endpoint.health.status.http-mapping.down=500
+management.endpoint.health.status.http-mapping.out_of_service=503