spring-boot-starter-actuator （健康监控）配置和使用

To add the actuator to a Maven based project, add the following ‘Starter’ dependency:

    
        org.springframework.boot
        spring-boot-starter-actuator
    

执行器端点允许您监视应用程序并与之交互。springboot包括许多内置的端点，您可以添加自己的端点。例如，运行状况端点提供基本的应用程序运行状况信息。每个端点都可以通过HTTP或JMX启用或禁用并公开（使远程可访问）。

默认情况下，运行状况端点映射到/actuator/health

ID	Description
auditevents	Exposes audit events information for the current application. Requires an AuditEventRepository bean.
beans	Displays a complete list of all the Spring beans in your application.
caches	Exposes available caches.
conditions	Shows the conditions that were evaluated on configuration and auto-configuration classes and the reasons why they did or did not match.
configprops	Displays a collated list of all @ConfigurationProperties.
env	Exposes properties from Spring’s ConfigurableEnvironment.
flyway	Shows any Flyway database migrations that have been applied. Requires one or more Flyway beans.
health	Shows application health information.
httptrace	Displays HTTP trace information (by default, the last 100 HTTP request-response exchanges). Requires an HttpTraceRepository bean.
info	Displays arbitrary application info.
integrationgraph	Shows the Spring Integration graph. Requires a dependency on spring-integration-core.
loggers	Shows and modifies the configuration of loggers in the application.
liquibase	Shows any Liquibase database migrations that have been applied. Requires one or more Liquibase beans.
metrics	Shows ‘metrics’ information for the current application.
mappings	Displays a collated list of all @RequestMapping paths.
scheduledtasks	Displays the scheduled tasks in your application.
sessions	Allows retrieval and deletion of user sessions from a Spring Session-backed session store. Requires a Servlet-based web application using Spring Session.
shutdown	Lets the application be gracefully shutdown. Disabled by default.
threaddump	Performs a thread dump.

If your application is a web application (Spring MVC, Spring WebFlux, or Jersey), you can use the following additional endpoints:

ID	Description
heapdump	Returns an hprof heap dump file.
jolokia	Exposes JMX beans over HTTP (when Jolokia is on the classpath, not available for WebFlux). Requires a dependency on jolokia-core.
logfile	Returns the contents of the logfile (if logging.file.name or logging.file.path properties have been set). Supports the use of the HTTP Range header to retrieve part of the log file’s content.
prometheus	Exposes metrics in a format that can be scraped by a Prometheus server. Requires a dependency on micrometer-registry-prometheus.

By default, all endpoints except for shutdown are enabled.

management.endpoints.enabled-by-default=false
management.endpoint.info.enabled=true

由于端点可能包含敏感信息，因此应该仔细考虑何时公开它们。下表显示了内置终结点的默认公开：

ID	JMX	Web
auditevents	Yes	No
beans	Yes	No
caches	Yes	No
conditions	Yes	No
configprops	Yes	No
env	Yes	No
flyway	Yes	No
health	Yes	Yes
heapdump	N/A	No
httptrace	Yes	No
info	Yes	Yes
integrationgraph	Yes	No
jolokia	N/A	No
logfile	N/A	No
loggers	Yes	No
liquibase	Yes	No
metrics	Yes	No
mappings	Yes	No
prometheus	N/A	No
scheduledtasks	Yes	No
sessions	Yes	No
shutdown	Yes	No
threaddump	Yes	No

*可用于选择所有终结点。例如，要通过HTTP公开除env和beans端点之外的所有内容，请使用以下属性：

management.endpoints.web.exposure.include=*
management.endpoints.web.exposure.exclude=env,beans

If your application is exposed publicly, we strongly recommend that you also secure your endpoints.

If you deploy applications behind a firewall, you may prefer that all your actuator endpoints can be accessed without requiring authentication. You can do so by changing the management.endpoints.web.exposure.include property, as follows:

application.properties

management.endpoints.web.exposure.include=*

CORS support is disabled by default and is only enabled once the management.endpoints.web.cors.allowed-origins property has been set. The following configuration permits GET and POST calls from the example.com domain:

CORS支持在默认情况下被禁用，并且仅在管理.endpoints.web.允许cors-已设置原点属性。以下配置允许来自example.com网站域：

management.endpoints.web.cors.allowed-origins=https://example.com
management.endpoints.web.cors.allowed-methods=GET,POST