In this chapter, you will learn in detail about how to enable Spring Boot actuator to your application. import javax.servlet.ServletException; Lets the application be gracefully shutdown. Some important Spring Boot Actuator endpoints are given below. In most situations, the out-of-the-box defaults will provide sensible metrics that can be published to any of the supported monioring systems. @GetMapping("/api/addresses") public class MyMeterRegistryConfiguration { import io.micrometer.jmx.JmxMeterRegistry; Unfortunately, an external system that is shared by all application instances is common, and you have to make a judgement call: include it in the readiness probe and expect that the application is taken out of service when the external service is down, or leave it out and deal with failures higher up the stack, e.g. If you need to apply customizations to specific Meter instances you can use the io.micrometer.core.instrument.config.MeterFilter interface. }; It provides vendor-neutral interfaces for timers, gauges, counters, distribution summaries, and long task timers with a dimensional data model. Also, if an application is using Kubernetes autoscaling it may react differently to applications being taken out of the load-balancer, depending on its autoscaler configuration. } Also, any, If an application takes longer to start than the configured liveness period, Kubernetes mention the. To enable Spring Boot actuator endpoints to your Spring Boot application, we need to add the Spring Boot Starter actuator dependency in our build configuration file. To replace the default tags, provide a @Bean that implements WebFluxTagsProvider. It will also register a KafkaStreamsMicrometerListener for StreamsBuilderFactoryBean. import javax.servlet.ServletContext; http.requestMatcher(EndpointRequest.toAnyEndpoint()) The Jolokia endpoint exposes Jolokias servlet as an actuator endpoint. Definition of Actuator An actuator is a manufacturing term that refers to a mechanical device for moving or controlling something. Servlet endpoints provide deeper integration with the Servlet container but at the expense of portability. Create a simple Spring boot project and add the following dependency: spring-cloud-config-server Update application.properties with the following property. To add the actuator to a Maven based project, add the following Starter dependency: For Gradle, use the following declaration: Actuator endpoints let you monitor and interact with your application. Auto creating tables failed in Spring JPA, Static content is not getting loaded with spring boot, CXF and spring boot actuator, actuator end points not available, problem with spring boot component scanning, Correct the classpath of your application so that it contains a single, compatible version of org.springframework.plugin.core.PluginRegistry, Fourier transform of a functional derivative, Water leaving the house when water cut off. @Timed annotations are supported on request-handling classes and methods (see @Timed Annotation Support for details). If the Readiness State of an application instance is unready, Kubernetes will not route traffic to that instance. Spring Boot manages your Application Availability State out-of-the-box. Spring Boot Actuator not working and application.properties are Unknown in STS, Spring Boot Actuator: Production-ready features, actuator /refresh is not being provided in SpringBoot 2.0.1, https://www.baeldung.com/spring-boot-actuators, Making location easier for developers with new data primitives, Stop requiring only one assertion per unit test: Multiple assertions are fine, Mobile app infrastructure being decommissioned, 2022 Moderator Election Q&A Question Collection. The following example enables the info endpoint and disables all other endpoints: Since Endpoints may contain sensitive information, careful consideration should be given about when to expose them. To add/include all ID information about your application, you can do it in the application.properties file by simply adding the following , All the IDs or the Endpoint are now enabled. An important aspect of the Kubernetes Probes support is its consistency with the application lifecycle. Introduction to RESTful Web Services With Spring Boot, Spring Boot Auto Configuration and Dispatcher Servlet, Enhancing the Hello World Service with a Path Variable, Implementing the POST Method to create User Resource, Implementing Exception Handling- 404 Resource Not Found, Implementing Generic Exception Handling for all Resources, Implementing DELETE Method to Delete a User Resource, Implementing Validations for RESTful Services, Implementing HATEOAS for RESTful Services, Content Negotiation Implementing Support for XML, Configuring Auto Generation of Swagger Documentation, Introduction to Swagger Documentation Format, Enhancing Swagger Documentation with Custom Annotations, Monitoring APIs with Spring Boot Actuator, Implementing Static Filtering for RESTful Services, Implementing Dynamic Filtering for RESTful Services, Versioning RESTful Web Services-Basic Approach With URIs, Implementing Basic Authentication with Spring Security, Updating GET Methods on User Resource to Use JPA, Updating POST and DELETE methods on UserResource to use JPA, Creating Post Entity and Many to One Relationship with User Entity, Implementing a GET service to retrieve all Posts of a User, Implementing POST Service to Create a Post for a User. If we want to get production-ready features in an application, we should use the Spring Boot actuator. } http.httpBasic(); public class MyCloudFoundryConfiguration { The Graphite server host and port to use can be provided using: Micrometer provides a default HierarchicalNameMapper that governs how a dimensional meter id is mapped to flat hierarchical names. pom.xml (Configuration of the Web Application), GfgActuatorApplication.java (Bootstrapping of the application), UserEntity.java (Entity class representing the model data). @Override 1.1. } We have the option to use JMX or HTTP end points to manage and monitor our applications on the production environment. Spring Boot includes number of built-in endpoints and we can also add custom endpoints in Spring Boot application. By default, the flowable endpoint is mapped to /actuator/flowable. As for the readiness Probe, the choice of checking external systems must be made carefully by the application developers, i.e. import java.util.Collections; Auto-configured ReactiveHealthIndicators, 2.9.1. } If the operation method returns void or Void the produces clause is empty. It automatically publishes the authentication events if spring-security is in execution. The path of the predicate is determined by the ID of the endpoint and the base path of web-exposed endpoints. Spring Boot enables security for all actuator endpoints. @Bean For example, to expose everything over HTTP except the env and beans endpoints, use the following properties: You should take care to secure HTTP endpoints in the same way that you would any other sensitive URL. It provides several features to monitor different modules of the project such as health, metrics, resources, etc. child.addServletContainerInitializer(initializer, Collections.emptySet()); import org.springframework.context.annotation.Configuration; Spring Boot Framework comes with a built-in mechanism for application configuration using a file called application.properties. import org.springframework.stereotype.Component; @Component The in-memory backend disables itself as soon as youre using any of the other available backend. It is often used by monitoring software to alert someone when a production system goes down. /actuator/metrics/jvm.memory.max. You can view either the entire list or an individual loggers configuration, which is made up of both the explicitly configured logging level as well as the effective logging level given to it by the logging framework. For example, an endpoint with the ID sessions will use /actuator/sessions as its path in the predicate. The application performs startup tasks and does not receive traffic yet. I tried various properties, in application.properties: In STS, all three lines are yellow underlined with message indicating unknown property. return (registry) -> registry.config().namingConvention(this::name); By default, the endpoint exposes git.branch, git.commit.id, and git.commit.time properties, if present. The following table shows the default exposure for the built-in endpoints: To change which endpoints are exposed, use the following technology-specific include and exclude properties: management.endpoints.jmx.exposure.exclude, management.endpoints.jmx.exposure.include, management.endpoints.web.exposure.exclude, management.endpoints.web.exposure.include. You can choose to manage and monitor your application by using HTTP endpoints or with JMX. public class MyController { To provide custom application information, you can register Spring beans that implement the InfoContributor interface. To export metrics to Datadog, your API key must be provided: You can also change the interval at which metrics are sent to Datadog: Dynatrace registry pushes metrics to the configured URI periodically. You can, for example, configure additional Health Indicators: By default, Spring Boot does not add other Health Indicators to these groups. Custom endpoint implementation. import io.micrometer.graphite.GraphiteMeterRegistry; Hypermedia for Actuator Web Endpoints, 2.8.4. Required maven/gradle dependencies A timer metric with the name mongodb.driver.commands is created for each command issued to the underlying MongoDB driver. import org.springframework.boot.actuate.health.HealthIndicator; The following example application.properties does not allow remote management connections: If you do not want to expose endpoints over HTTP, you can set the management port to -1, as shown in the following example: This can be achieved using the management.endpoints.web.exposure.exclude property as well, as shown in the following example: Java Management Extensions (JMX) provide a standard mechanism to monitor and manage applications. meter name. } @GetMapping("/api/addresses") To solve this problem, you can set the spring.jmx.unique-names property to true so that MBean names are always unique. If you dont want to record metrics for all Spring WebFlux requests, you can set management.metrics.web.server.request.autotime.enabled to false and exclusively use @Timed annotations instead. In this tutorial we will learn how to use the HTTP Tracing Actuator Endpoint. import io.micrometer.core.instrument.binder.mongodb.MongoConnectionPoolTagsProvider; import io.micrometer.core.instrument.Meter; Assuming you use Maven, you could rewrite the preceding example as follows: Another useful feature of the info endpoint is its ability to publish information about the state of your git source code repository when the project was built. Commons tags are applied to all meters and can be configured as shown in the following example: The example above adds region and stack tags to all meters with a value of us-east-1 and prod respectively. Step 8: Create a Controller class. A Servlet can be exposed as an endpoint by implementing a class annotated with @ServletEndpoint that also implements Supplier. Requires an HttpTraceRepository bean. Doing so can be useful if you want to listen only on an internal or ops-facing network or to listen only for connections from localhost. For example the health endpoint provides basic application health information. Shows metrics information for the current application. How to Run Your First Spring Boot Application in Spring Tool Suite? child.setPath("/cloudfoundryapplication"); } Maven dependencies Spring actuator. Displays a complete list of all the Spring beans in your application. The following cache libraries are supported: Any compliant JCache (JSR-107) implementation. Additionally, you can activate other Actuator IDs and use them after /actuator to see more information. Spring Boot includes a number of additional features to help you monitor and manage your application when you push it to production. Auto-configuration enables the event metrics for both Logback and Log4J2. import org.springframework.stereotype.Component; @Component Requires a dependency on jolokia-core. this.dictionary = Dictionary.load(); To provide custom health information, you can register Spring beans that implement the HealthIndicator interface. The configuration will differ depending on the web server in use. @Override Project generation with Spring Initializr including Spring Cloud's AWS Core, Spring Web and Actuator. To add to the default tags, provide one or more @Beans that implement WebMvcTagsContributor. The following HealthIndicators are auto-configured by Spring Boot when appropriate. HTTP Tracing can be enabled by providing a bean of type HttpTraceRepository in your applications configuration. Exposes git information if a git.properties file is available. } Auto-configuration enables the instrumentation of all requests handled by the Jersey JAX-RS implementation whenever Micrometers micrometer-jersey2 module is on the classpath. The @Timed annotation from the io.micrometer.core.annotation package can be used with several of the supported technologies listed above. How to disable security in Spring-Boot 2? By default, WebFlux related metrics are tagged with the following information: To add to the default tags, provide one or more @Beans that implement WebFluxTagsContributor. To view the Spring beans and its types, scopes and dependency. The /actuator base path can be configured by using the management.endpoints.web.base-path property, as shown in the following example: management.endpoints.web.base-path=/manage The preceding application.properties example changes the form of the endpoint URLs from /actuator/ {id} to /manage/ {id}. import io.micrometer.core.annotation.Timed; or logback.events. A CompositeHealthContributor provides a composite of other HealthContributors. In this case, a probe check could be successful even if the main application does not work properly (for example, it cannot accept new connections). @Value We can inject a specific property in a bean with the @Value ($ {'property'}) annotation. import io.micrometer.graphite.GraphiteConfig; For example, your application might already use /actuator for another purpose. Actuator configures the "liveness" and "readiness" probes as Health Groups; this means that all the Health Groups features are available for them.